diff --git a/docs/guides/FEATURES.md b/docs/guides/FEATURES.md
index df79c1d0ef..0ae629121b 100644
--- a/docs/guides/FEATURES.md
+++ b/docs/guides/FEATURES.md
@@ -53,6 +53,8 @@ The v3.7.x → v3.8.0 cycle added zero-config auto routing, new providers, OAuth
 
 Manage AI provider connections: OAuth providers (Claude Code, Codex, Gemini CLI), API key providers (Groq, DeepSeek, OpenRouter), and free providers (Qoder, Qwen, Kiro). Kiro accounts include credit balance tracking — remaining credits, total allowance, and renewal date visible in Dashboard → Usage.
 
+OpenRouter connections can store a per-connection `preset` in Advanced Settings. When set, OmniRoute sends it as the OpenRouter top-level request field, for example `"preset": "email-copywriter"`, unless the client request already supplied its own `preset`.
+
 ![Providers Dashboard](../screenshots/01-providers.png)
 
 ---
diff --git a/open-sse/executors/default.ts b/open-sse/executors/default.ts
index 2ec6fbd6b3..a585c0a72f 100644
--- a/open-sse/executors/default.ts
+++ b/open-sse/executors/default.ts
@@ -151,6 +151,14 @@ function normalizeOpenAIChatUrl(baseUrl) {
   return `${normalized}/v1/chat/completions`;
 }
 
+function getOpenRouterConnectionPreset(
+  providerSpecificData?: Record<string, unknown> | null
+): string | null {
+  const preset =
+    typeof providerSpecificData?.preset === "string" ? providerSpecificData.preset.trim() : "";
+  return preset || null;
+}
+
 export class DefaultExecutor extends BaseExecutor {
   constructor(provider) {
     super(provider, PROVIDERS[provider] || PROVIDERS.openai);
@@ -564,6 +572,16 @@ export class DefaultExecutor extends BaseExecutor {
           }
         }
       }
+
+      if (this.provider === "openrouter") {
+        const connectionPreset = getOpenRouterConnectionPreset(credentials?.providerSpecificData);
+        if (connectionPreset && (withDefaults as Record<string, unknown>).preset === undefined) {
+          withDefaults = {
+            ...(withDefaults as Record<string, unknown>),
+            preset: connectionPreset,
+          };
+        }
+      }
     }
 
     if (this.provider === "qwen" && typeof withDefaults === "object" && withDefaults !== null) {
diff --git a/src/app/(dashboard)/dashboard/providers/[id]/components/OpenRouterPresetInput.tsx b/src/app/(dashboard)/dashboard/providers/[id]/components/OpenRouterPresetInput.tsx
new file mode 100644
index 0000000000..280f420f69
--- /dev/null
+++ b/src/app/(dashboard)/dashboard/providers/[id]/components/OpenRouterPresetInput.tsx
@@ -0,0 +1,54 @@
+"use client";
+
+import { useCallback, useMemo, useState } from "react";
+import { Input } from "@/shared/components";
+import { OPENROUTER_PRESET_MAX_LENGTH } from "@/shared/constants/openRouterPreset";
+import { providerText, type ProviderMessageTranslator } from "../providerPageHelpers";
+
+interface OpenRouterPresetInputProps {
+  value: string;
+  onChange: (value: string) => void;
+  t: ProviderMessageTranslator;
+}
+
+export default function OpenRouterPresetInput({ value, onChange, t }: OpenRouterPresetInputProps) {
+  return (
+    <Input
+      label={providerText(t, "openRouterPresetLabel", "OpenRouter preset")}
+      value={value}
+      onChange={(e) => onChange(e.target.value)}
+      placeholder="email-copywriter"
+      maxLength={OPENROUTER_PRESET_MAX_LENGTH}
+      hint={providerText(
+        t,
+        "openRouterPresetHint",
+        "Sends this connection's preset as the OpenRouter top-level preset field."
+      )}
+    />
+  );
+}
+
+export function useOpenRouterPresetControl(
+  provider: string | null | undefined,
+  t: ProviderMessageTranslator
+) {
+  const [value, setValue] = useState("");
+  const isOpenRouter = provider === "openrouter";
+  const applyTo = useCallback(
+    (data: Record<string, unknown>) => {
+      const preset = value.trim();
+      if (isOpenRouter && preset) data.preset = preset;
+    },
+    [isOpenRouter, value]
+  );
+  const getPatch = useCallback(() => {
+    if (!isOpenRouter) return {};
+    const preset = value.trim();
+    return { preset: preset || null };
+  }, [isOpenRouter, value]);
+  const input = useMemo(
+    () => (isOpenRouter ? <OpenRouterPresetInput t={t} value={value} onChange={setValue} /> : null),
+    [isOpenRouter, t, value]
+  );
+  return { applyTo, getPatch, input, isOpenRouter, setValue };
+}
diff --git a/src/app/(dashboard)/dashboard/providers/[id]/components/modals/AddApiKeyModal.tsx b/src/app/(dashboard)/dashboard/providers/[id]/components/modals/AddApiKeyModal.tsx
index df432143dc..59d94f0131 100644
--- a/src/app/(dashboard)/dashboard/providers/[id]/components/modals/AddApiKeyModal.tsx
+++ b/src/app/(dashboard)/dashboard/providers/[id]/components/modals/AddApiKeyModal.tsx
@@ -1,15 +1,9 @@
 "use client";
 
-// Issue #3501 Phase 1c — extracted from the god-component.
-// ~787-LOC modal for adding a new API key / credential to a provider.
-
 import { useState, useEffect, useRef } from "react";
 import { useTranslations } from "next-intl";
 import { Button, Badge, Input, Modal, Toggle } from "@/shared/components";
-import {
-  providerAllowsOptionalApiKey,
-  supportsBulkApiKey,
-} from "@/shared/constants/providers";
+import { providerAllowsOptionalApiKey, supportsBulkApiKey } from "@/shared/constants/providers";
 import { parseBulkApiKeys } from "@/shared/utils/bulkApiKeyParser";
 import {
   isBaseUrlConfigurableProvider,
@@ -30,6 +24,7 @@ import {
   type CommandCodeAuthFlowState,
 } from "../../providerPageHelpers";
 import { getWebSessionCredentialRequirement } from "../../webSessionCredentials";
+import { useOpenRouterPresetControl } from "../OpenRouterPresetInput";
 import WebSessionCredentialGuide from "../WebSessionCredentialGuide";
 
 export interface AddApiKeyModalProps {
@@ -76,6 +71,7 @@ export default function AddApiKeyModal({
   const defaultRegion = isBedrock ? "eu-west-2" : "us-central1";
   const isGlm = isGlmProvider(provider);
   const isQoder = provider === "qoder";
+  const openRouterPreset = useOpenRouterPresetControl(provider, t);
   const isCloudflare = provider === "cloudflare-ai";
   const localProviderMetadata = getLocalProviderMetadata(provider);
   const isLocalSelfHostedProvider = !!localProviderMetadata;
@@ -133,7 +129,6 @@ export default function AddApiKeyModal({
       baseUrl: initialBaseUrl || defaultBaseUrl,
     }));
   }, [defaultBaseUrl, initialBaseUrl, isOpen]);
-
   const bulkSupported = supportsBulkApiKey(provider);
   const [mode, setMode] = useState<"single" | "bulk">("single");
   const [bulkText, setBulkText] = useState("");
@@ -278,7 +273,6 @@ export default function AddApiKeyModal({
 
       if (!isValid) {
         if (apiKeyOptional && !credentialInput) {
-          // Bypass validation block for local/optional providers when no key is provided
           console.debug("Validation failed but apiKey is optional; proceeding to save.");
         } else {
           setSaveError(validationError || credentialValidationFailedMessage);
@@ -290,6 +284,7 @@ export default function AddApiKeyModal({
       if (formData.customUserAgent.trim()) {
         providerSpecificData.customUserAgent = formData.customUserAgent.trim();
       }
+      openRouterPreset.applyTo(providerSpecificData);
       if (formData.routingTags.trim()) {
         providerSpecificData.tags = parseRoutingTagsInput(formData.routingTags);
       }
@@ -347,15 +342,18 @@ export default function AddApiKeyModal({
     setSaveError(null);
 
     try {
-      let providerSpecificData: Record<string, unknown> | undefined;
+      const bulkProviderSpecificData: Record<string, unknown> = {};
       if (usesBaseUrl) {
         const checked = normalizeAndValidateHttpBaseUrl(formData.baseUrl, defaultBaseUrl);
         if (checked.error) {
           setSaveError(checked.error);
           return;
         }
-        providerSpecificData = { baseUrl: checked.value };
+        bulkProviderSpecificData.baseUrl = checked.value;
       }
+      openRouterPreset.applyTo(bulkProviderSpecificData);
+      const providerSpecificData =
+        Object.keys(bulkProviderSpecificData).length > 0 ? bulkProviderSpecificData : undefined;
 
       const res = await fetch("/api/providers/bulk", {
         method: "POST",
@@ -432,6 +430,7 @@ export default function AddApiKeyModal({
         {bulkSupported && mode === "bulk" && (
           <div className="flex flex-col gap-3">
             <p className="text-xs text-text-muted">{t("bulkAddFormatHint")}</p>
+            {openRouterPreset.input}
             <textarea
               className="w-full rounded border border-border bg-background p-2 text-sm font-mono resize-y min-h-[140px] focus:outline-none focus:ring-1 focus:ring-primary"
               placeholder={"name1|sk-key1\nname2|sk-key2\nsk-key-only-auto-named"}
@@ -725,6 +724,7 @@ export default function AddApiKeyModal({
                   placeholder="my-app/1.0"
                   hint={t("customUserAgentHint")}
                 />
+                {openRouterPreset.input}
                 <Input
                   label={t("routingTagsLabel")}
                   value={formData.routingTags}
diff --git a/src/app/(dashboard)/dashboard/providers/[id]/components/modals/EditConnectionModal.tsx b/src/app/(dashboard)/dashboard/providers/[id]/components/modals/EditConnectionModal.tsx
index 5103fe1cc2..922885db36 100644
--- a/src/app/(dashboard)/dashboard/providers/[id]/components/modals/EditConnectionModal.tsx
+++ b/src/app/(dashboard)/dashboard/providers/[id]/components/modals/EditConnectionModal.tsx
@@ -1,8 +1,5 @@
 "use client";
 
-// Issue #3501 Phase 1c — extracted from the god-component.
-// ~1091-LOC modal for editing an existing provider connection.
-
 import { useState, useEffect, useMemo } from "react";
 import { useTranslations } from "next-intl";
 import { Button, Badge, Input, Modal, Toggle, Select } from "@/shared/components";
@@ -48,6 +45,7 @@ import {
   formatTimeAgo,
 } from "../../providerPageHelpers";
 import { getWebSessionCredentialRequirement } from "../../webSessionCredentials";
+import { useOpenRouterPresetControl } from "../OpenRouterPresetInput";
 import WebSessionCredentialGuide from "../WebSessionCredentialGuide";
 
 export interface EditConnectionModalConnection {
@@ -145,6 +143,8 @@ export default function EditConnectionModal({
   const showsRegion = isVertex || isBedrock;
   const isGlm = isGlmProvider(connection?.provider);
   const isCloudflare = connection?.provider === "cloudflare-ai";
+  const openRouterPreset = useOpenRouterPresetControl(connection?.provider, t);
+  const setOpenRouterPreset = openRouterPreset.setValue;
   const isCodex = connection?.provider === "codex";
   const isClaude = connection?.provider === "claude";
   const isGeminiCli = connection?.provider === "gemini-cli";
@@ -201,6 +201,9 @@ export default function EditConnectionModal({
       const rawCustomUserAgent = connection.providerSpecificData?.customUserAgent;
       const existingCustomUserAgent =
         typeof rawCustomUserAgent === "string" ? rawCustomUserAgent : "";
+      const rawOpenRouterPreset = connection.providerSpecificData?.preset;
+      const existingOpenRouterPreset =
+        typeof rawOpenRouterPreset === "string" ? rawOpenRouterPreset : "";
       const rawCx = connection.providerSpecificData?.cx;
       const existingCx = typeof rawCx === "string" ? rawCx : "";
       const rawAccountId = connection.providerSpecificData?.accountId;
@@ -270,10 +273,8 @@ export default function EditConnectionModal({
         passthroughModels: connection?.providerSpecificData?.passthroughModels === true,
         disableCooling: connection?.providerSpecificData?.disableCooling === true,
       });
-      // Load existing extra keys from providerSpecificData
       const existing = connection.providerSpecificData?.extraApiKeys;
       setExtraApiKeys(Array.isArray(existing) ? existing : []);
-      // Load API key health status
       const health = connection.providerSpecificData?.apiKeyHealth as
         | Record<
             string,
@@ -288,13 +289,16 @@ export default function EditConnectionModal({
         | undefined;
       setApiKeyHealth(health || {});
       setNewExtraKey("");
-      setShowAdvanced(!!existingCustomUserAgent);
-      // email visibility controlled by global store
+      setOpenRouterPreset(existingOpenRouterPreset);
+      setShowAdvanced(
+        !!existingCustomUserAgent ||
+          (connection.provider === "openrouter" && !!existingOpenRouterPreset)
+      );
       setTestResult(null);
       setValidationResult(null);
       setSaveError(null);
     }
-  }, [isOpen, connection, defaultBaseUrl, showsRegion, defaultRegion]);
+  }, [isOpen, connection, defaultBaseUrl, showsRegion, defaultRegion, setOpenRouterPreset]);
 
   const handleTest = async () => {
     if (!connection?.provider) return;
@@ -392,7 +396,6 @@ export default function EditConnectionModal({
         healthCheckInterval: formData.healthCheckInterval,
       };
 
-      // Build rateLimitOverrides from non-empty fields
       const overrides: Record<string, number> = {};
       if (formData.rpm.trim()) overrides.rpm = Number(formData.rpm);
       if (formData.tpm.trim()) overrides.tpm = Number(formData.tpm);
@@ -460,7 +463,6 @@ export default function EditConnectionModal({
           updates.rateLimitedUntil = null;
         }
       }
-      // Persist extra API keys and baseUrl in providerSpecificData
       if (!isOAuth) {
         updates.providerSpecificData = {
           ...(connection.providerSpecificData || {}),
@@ -469,7 +471,7 @@ export default function EditConnectionModal({
           tags: parseRoutingTagsInput(formData.routingTags),
           excludedModels: parseExcludedModelsInput(formData.excludedModels),
           customUserAgent: formData.customUserAgent.trim(),
-          // Only write when explicitly enabled; omit to let registry default take effect
+          ...openRouterPreset.getPatch(),
           ...(formData.passthroughModels ? { passthroughModels: true } : {}),
         };
         if (connection.provider === "bailian-coding-plan") {
@@ -513,7 +515,6 @@ export default function EditConnectionModal({
             Object.keys(currentRequestDefaults).length > 0 ? currentRequestDefaults : undefined;
         }
       } else {
-        // Also persist tag for OAuth accounts
         updates.providerSpecificData = {
           ...(connection.providerSpecificData || {}),
           tag: formData.tag.trim() || undefined,
@@ -546,8 +547,6 @@ export default function EditConnectionModal({
           ),
         };
       }
-      // #2997: persist the transient-cooldown opt-out; write only when enabled,
-      // clear it otherwise so a disabled toggle does not linger as `false`.
       if (updates.providerSpecificData) {
         updates.providerSpecificData.disableCooling = formData.disableCooling ? true : undefined;
       }
@@ -831,6 +830,7 @@ export default function EditConnectionModal({
                   placeholder="my-app/1.0"
                   hint={t("customUserAgentHint")}
                 />
+                {openRouterPreset.input}
                 <Toggle
                   size="sm"
                   checked={formData.passthroughModels}
diff --git a/src/lib/providers/requestDefaults.ts b/src/lib/providers/requestDefaults.ts
index 5f6debadff..018c7c85bb 100644
--- a/src/lib/providers/requestDefaults.ts
+++ b/src/lib/providers/requestDefaults.ts
@@ -3,6 +3,7 @@ const CLAUDE_CODE_COMPATIBLE_PROVIDER_PREFIX = "anthropic-compatible-cc-";
 
 import { normalizeExcludedModelPatterns } from "@/domain/connectionModelRules";
 import { normalizeRoutingTags } from "@/domain/tagRouter";
+import { normalizeOpenRouterPreset } from "@/shared/constants/openRouterPreset";
 
 export const CODEX_REASONING_EFFORT_VALUES = ["none", "low", "medium", "high", "xhigh"] as const;
 
@@ -132,6 +133,15 @@ export function normalizeProviderSpecificData(
     delete normalized.autoFetchModels;
   }
 
+  if ("preset" in normalized) {
+    const preset = provider === "openrouter" ? normalizeOpenRouterPreset(normalized.preset) : null;
+    if (preset) {
+      normalized.preset = preset;
+    } else {
+      delete normalized.preset;
+    }
+  }
+
   if (provider === "bedrock" && "region" in normalized) {
     const region = normalizeAwsRegion(normalized.region);
     if (region) {
diff --git a/src/shared/constants/openRouterPreset.ts b/src/shared/constants/openRouterPreset.ts
new file mode 100644
index 0000000000..745ddef85b
--- /dev/null
+++ b/src/shared/constants/openRouterPreset.ts
@@ -0,0 +1,11 @@
+export const OPENROUTER_PRESET_MAX_LENGTH = 200;
+
+export function isOpenRouterPresetValue(value: unknown): value is string {
+  return typeof value === "string" && value.trim().length <= OPENROUTER_PRESET_MAX_LENGTH;
+}
+
+export function normalizeOpenRouterPreset(value: unknown): string | undefined {
+  if (!isOpenRouterPresetValue(value)) return undefined;
+  const normalized = value.trim();
+  return normalized || undefined;
+}
diff --git a/src/shared/validation/providerSpecificData.ts b/src/shared/validation/providerSpecificData.ts
new file mode 100644
index 0000000000..138119b8e7
--- /dev/null
+++ b/src/shared/validation/providerSpecificData.ts
@@ -0,0 +1,265 @@
+import { z } from "zod";
+import {
+  OPENROUTER_PRESET_MAX_LENGTH,
+  isOpenRouterPresetValue,
+} from "@/shared/constants/openRouterPreset";
+
+function isHttpUrl(value: string): boolean {
+  try {
+    const parsed = new URL(value);
+    return parsed.protocol === "http:" || parsed.protocol === "https:";
+  } catch {
+    return false;
+  }
+}
+
+const CODEX_REASONING_EFFORT_VALUES = new Set(["none", "low", "medium", "high", "xhigh"]);
+const REQUEST_DEFAULT_SERVICE_TIER_VALUES = new Set(["default", "priority", "fast", "flex"]);
+
+export function validateProviderSpecificData(
+  data: Record<string, unknown> | undefined,
+  ctx: z.RefinementCtx
+): void {
+  if (!data) return;
+
+  const baseUrl = data.baseUrl;
+  if (baseUrl !== undefined && (typeof baseUrl !== "string" || !isHttpUrl(baseUrl))) {
+    ctx.addIssue({
+      code: z.ZodIssueCode.custom,
+      message: "providerSpecificData.baseUrl must be a valid http(s) URL",
+      path: ["baseUrl"],
+    });
+  }
+
+  const customUserAgent = data.customUserAgent;
+  if (
+    customUserAgent !== undefined &&
+    customUserAgent !== null &&
+    (typeof customUserAgent !== "string" || customUserAgent.length > 500)
+  ) {
+    ctx.addIssue({
+      code: z.ZodIssueCode.custom,
+      message: "providerSpecificData.customUserAgent must be a string up to 500 chars",
+      path: ["customUserAgent"],
+    });
+  }
+
+  const cx = data.cx;
+  if (cx !== undefined && cx !== null && (typeof cx !== "string" || cx.length > 500)) {
+    ctx.addIssue({
+      code: z.ZodIssueCode.custom,
+      message: "providerSpecificData.cx must be a string up to 500 chars",
+      path: ["cx"],
+    });
+  }
+
+  const region = data.region;
+  if (
+    region !== undefined &&
+    region !== null &&
+    (typeof region !== "string" || region.length > 64)
+  ) {
+    ctx.addIssue({
+      code: z.ZodIssueCode.custom,
+      message: "providerSpecificData.region must be a string up to 64 chars",
+      path: ["region"],
+    });
+  }
+
+  const openaiStoreEnabled = data.openaiStoreEnabled;
+  if (openaiStoreEnabled !== undefined && typeof openaiStoreEnabled !== "boolean") {
+    ctx.addIssue({
+      code: z.ZodIssueCode.custom,
+      message: "providerSpecificData.openaiStoreEnabled must be a boolean",
+      path: ["openaiStoreEnabled"],
+    });
+  }
+
+  const blockExtraUsage = data.blockExtraUsage;
+  if (blockExtraUsage !== undefined && typeof blockExtraUsage !== "boolean") {
+    ctx.addIssue({
+      code: z.ZodIssueCode.custom,
+      message: "providerSpecificData.blockExtraUsage must be a boolean",
+      path: ["blockExtraUsage"],
+    });
+  }
+
+  const autoFetchModels = data.autoFetchModels;
+  if (autoFetchModels !== undefined && typeof autoFetchModels !== "boolean") {
+    ctx.addIssue({
+      code: z.ZodIssueCode.custom,
+      message: "providerSpecificData.autoFetchModels must be a boolean",
+      path: ["autoFetchModels"],
+    });
+  }
+
+  const disableStreamOptions = data.disableStreamOptions;
+  if (disableStreamOptions !== undefined && typeof disableStreamOptions !== "boolean") {
+    ctx.addIssue({
+      code: z.ZodIssueCode.custom,
+      message: "providerSpecificData.disableStreamOptions must be a boolean",
+      path: ["disableStreamOptions"],
+    });
+  }
+
+  const preset = data.preset;
+  if (preset !== undefined && preset !== null && !isOpenRouterPresetValue(preset)) {
+    ctx.addIssue({
+      code: z.ZodIssueCode.custom,
+      message: `providerSpecificData.preset must be a string up to ${OPENROUTER_PRESET_MAX_LENGTH} chars`,
+      path: ["preset"],
+    });
+  }
+
+  const requestDefaults = data.requestDefaults;
+  if (requestDefaults !== undefined) {
+    if (!requestDefaults || typeof requestDefaults !== "object" || Array.isArray(requestDefaults)) {
+      ctx.addIssue({
+        code: z.ZodIssueCode.custom,
+        message: "providerSpecificData.requestDefaults must be an object",
+        path: ["requestDefaults"],
+      });
+    } else {
+      const requestDefaultsRecord = requestDefaults as Record<string, unknown>;
+      const reasoningEffort = requestDefaultsRecord.reasoningEffort;
+      if (
+        reasoningEffort !== undefined &&
+        reasoningEffort !== null &&
+        (typeof reasoningEffort !== "string" ||
+          !CODEX_REASONING_EFFORT_VALUES.has(reasoningEffort.trim().toLowerCase()))
+      ) {
+        ctx.addIssue({
+          code: z.ZodIssueCode.custom,
+          message:
+            "providerSpecificData.requestDefaults.reasoningEffort must be one of none, low, medium, high, xhigh",
+          path: ["requestDefaults", "reasoningEffort"],
+        });
+      }
+
+      const serviceTier = requestDefaultsRecord.serviceTier;
+      if (
+        serviceTier !== undefined &&
+        serviceTier !== null &&
+        (typeof serviceTier !== "string" ||
+          !REQUEST_DEFAULT_SERVICE_TIER_VALUES.has(serviceTier.trim().toLowerCase()))
+      ) {
+        ctx.addIssue({
+          code: z.ZodIssueCode.custom,
+          message:
+            "providerSpecificData.requestDefaults.serviceTier must be one of default, priority, fast, flex when provided",
+          path: ["requestDefaults", "serviceTier"],
+        });
+      }
+
+      const context1m = requestDefaultsRecord.context1m;
+      if (context1m !== undefined && context1m !== null && typeof context1m !== "boolean") {
+        ctx.addIssue({
+          code: z.ZodIssueCode.custom,
+          message: "providerSpecificData.requestDefaults.context1m must be a boolean",
+          path: ["requestDefaults", "context1m"],
+        });
+      }
+    }
+  }
+
+  const consoleApiKey = data.consoleApiKey;
+  if (consoleApiKey !== undefined && consoleApiKey !== null && typeof consoleApiKey !== "string") {
+    ctx.addIssue({
+      code: z.ZodIssueCode.custom,
+      message: "providerSpecificData.consoleApiKey must be a string",
+      path: ["consoleApiKey"],
+    });
+  }
+  if (typeof consoleApiKey === "string" && consoleApiKey.length > 10000) {
+    ctx.addIssue({
+      code: z.ZodIssueCode.custom,
+      message: "providerSpecificData.consoleApiKey must be at most 10000 characters",
+      path: ["consoleApiKey"],
+    });
+  }
+
+  const groupTag = data.tag;
+  if (
+    groupTag !== undefined &&
+    groupTag !== null &&
+    (typeof groupTag !== "string" || groupTag.length > 100)
+  ) {
+    ctx.addIssue({
+      code: z.ZodIssueCode.custom,
+      message: "providerSpecificData.tag must be a string up to 100 chars",
+      path: ["tag"],
+    });
+  }
+
+  const routingTags = data.tags;
+  if (routingTags !== undefined && routingTags !== null) {
+    if (!Array.isArray(routingTags) || routingTags.length > 50) {
+      ctx.addIssue({
+        code: z.ZodIssueCode.custom,
+        message: "providerSpecificData.tags must be an array with at most 50 items",
+        path: ["tags"],
+      });
+    } else if (
+      routingTags.some(
+        (tag) => typeof tag !== "string" || tag.trim().length === 0 || tag.trim().length > 64
+      )
+    ) {
+      ctx.addIssue({
+        code: z.ZodIssueCode.custom,
+        message:
+          "providerSpecificData.tags must contain non-empty strings up to 64 characters each",
+        path: ["tags"],
+      });
+    }
+  }
+
+  const excludedModels = data.excludedModels ?? data.excluded_models;
+  if (excludedModels !== undefined && excludedModels !== null) {
+    if (typeof excludedModels === "string") {
+      if (excludedModels.length > 5000) {
+        ctx.addIssue({
+          code: z.ZodIssueCode.custom,
+          message: "providerSpecificData.excludedModels string must be up to 5000 chars",
+          path: ["excludedModels"],
+        });
+      }
+    } else if (!Array.isArray(excludedModels) || excludedModels.length > 100) {
+      ctx.addIssue({
+        code: z.ZodIssueCode.custom,
+        message: "providerSpecificData.excludedModels must be an array with at most 100 items",
+        path: ["excludedModels"],
+      });
+    } else if (
+      excludedModels.some(
+        (pattern) =>
+          typeof pattern !== "string" ||
+          pattern.trim().length === 0 ||
+          pattern.trim().length > 200 ||
+          pattern.trim() === "**"
+      )
+    ) {
+      ctx.addIssue({
+        code: z.ZodIssueCode.custom,
+        message:
+          "providerSpecificData.excludedModels must contain non-empty patterns up to 200 characters",
+        path: ["excludedModels"],
+      });
+    }
+  }
+
+  const clientProfile = data.clientProfile;
+  if (clientProfile !== undefined && clientProfile !== null) {
+    const normalized = typeof clientProfile === "string" ? clientProfile.trim().toLowerCase() : "";
+    if (
+      typeof clientProfile !== "string" ||
+      !["ide", "harness", "cli", "sdk"].includes(normalized)
+    ) {
+      ctx.addIssue({
+        code: z.ZodIssueCode.custom,
+        message:
+          "providerSpecificData.clientProfile must be ide, harness, cli, or sdk (cli/sdk map to harness)",
+        path: ["clientProfile"],
+      });
+    }
+  }
+}
diff --git a/src/shared/validation/schemas.ts b/src/shared/validation/schemas.ts
index dc2084a672..480a01e9c6 100644
--- a/src/shared/validation/schemas.ts
+++ b/src/shared/validation/schemas.ts
@@ -13,259 +13,7 @@ import {
   isForbiddenCustomHeaderName,
 } from "@/shared/constants/upstreamHeaders";
 import { MAX_TIMER_TIMEOUT_MS } from "@/shared/utils/runtimeTimeouts";
-
-function isHttpUrl(value: string): boolean {
-  try {
-    const parsed = new URL(value);
-    return parsed.protocol === "http:" || parsed.protocol === "https:";
-  } catch {
-    return false;
-  }
-}
-
-const CODEX_REASONING_EFFORT_VALUES = new Set(["none", "low", "medium", "high", "xhigh"]);
-const REQUEST_DEFAULT_SERVICE_TIER_VALUES = new Set(["default", "priority", "fast", "flex"]);
-
-function validateProviderSpecificData(
-  data: Record<string, unknown> | undefined,
-  ctx: z.RefinementCtx
-): void {
-  if (!data) return;
-
-  const baseUrl = data.baseUrl;
-  if (baseUrl !== undefined && (typeof baseUrl !== "string" || !isHttpUrl(baseUrl))) {
-    ctx.addIssue({
-      code: z.ZodIssueCode.custom,
-      message: "providerSpecificData.baseUrl must be a valid http(s) URL",
-      path: ["baseUrl"],
-    });
-  }
-
-  const customUserAgent = data.customUserAgent;
-  if (
-    customUserAgent !== undefined &&
-    customUserAgent !== null &&
-    (typeof customUserAgent !== "string" || customUserAgent.length > 500)
-  ) {
-    ctx.addIssue({
-      code: z.ZodIssueCode.custom,
-      message: "providerSpecificData.customUserAgent must be a string up to 500 chars",
-      path: ["customUserAgent"],
-    });
-  }
-
-  const cx = data.cx;
-  if (cx !== undefined && cx !== null && (typeof cx !== "string" || cx.length > 500)) {
-    ctx.addIssue({
-      code: z.ZodIssueCode.custom,
-      message: "providerSpecificData.cx must be a string up to 500 chars",
-      path: ["cx"],
-    });
-  }
-
-  const region = data.region;
-  if (
-    region !== undefined &&
-    region !== null &&
-    (typeof region !== "string" || region.length > 64)
-  ) {
-    ctx.addIssue({
-      code: z.ZodIssueCode.custom,
-      message: "providerSpecificData.region must be a string up to 64 chars",
-      path: ["region"],
-    });
-  }
-
-  const openaiStoreEnabled = data.openaiStoreEnabled;
-  if (openaiStoreEnabled !== undefined && typeof openaiStoreEnabled !== "boolean") {
-    ctx.addIssue({
-      code: z.ZodIssueCode.custom,
-      message: "providerSpecificData.openaiStoreEnabled must be a boolean",
-      path: ["openaiStoreEnabled"],
-    });
-  }
-
-  const blockExtraUsage = data.blockExtraUsage;
-  if (blockExtraUsage !== undefined && typeof blockExtraUsage !== "boolean") {
-    ctx.addIssue({
-      code: z.ZodIssueCode.custom,
-      message: "providerSpecificData.blockExtraUsage must be a boolean",
-      path: ["blockExtraUsage"],
-    });
-  }
-
-  const autoFetchModels = data.autoFetchModels;
-  if (autoFetchModels !== undefined && typeof autoFetchModels !== "boolean") {
-    ctx.addIssue({
-      code: z.ZodIssueCode.custom,
-      message: "providerSpecificData.autoFetchModels must be a boolean",
-      path: ["autoFetchModels"],
-    });
-  }
-
-  const disableStreamOptions = data.disableStreamOptions;
-  if (disableStreamOptions !== undefined && typeof disableStreamOptions !== "boolean") {
-    ctx.addIssue({
-      code: z.ZodIssueCode.custom,
-      message: "providerSpecificData.disableStreamOptions must be a boolean",
-      path: ["disableStreamOptions"],
-    });
-  }
-
-  const requestDefaults = data.requestDefaults;
-  if (requestDefaults !== undefined) {
-    if (!requestDefaults || typeof requestDefaults !== "object" || Array.isArray(requestDefaults)) {
-      ctx.addIssue({
-        code: z.ZodIssueCode.custom,
-        message: "providerSpecificData.requestDefaults must be an object",
-        path: ["requestDefaults"],
-      });
-    } else {
-      const requestDefaultsRecord = requestDefaults as Record<string, unknown>;
-      const reasoningEffort = requestDefaultsRecord.reasoningEffort;
-      if (
-        reasoningEffort !== undefined &&
-        reasoningEffort !== null &&
-        (typeof reasoningEffort !== "string" ||
-          !CODEX_REASONING_EFFORT_VALUES.has(reasoningEffort.trim().toLowerCase()))
-      ) {
-        ctx.addIssue({
-          code: z.ZodIssueCode.custom,
-          message:
-            "providerSpecificData.requestDefaults.reasoningEffort must be one of none, low, medium, high, xhigh",
-          path: ["requestDefaults", "reasoningEffort"],
-        });
-      }
-
-      const serviceTier = requestDefaultsRecord.serviceTier;
-      if (
-        serviceTier !== undefined &&
-        serviceTier !== null &&
-        (typeof serviceTier !== "string" ||
-          !REQUEST_DEFAULT_SERVICE_TIER_VALUES.has(serviceTier.trim().toLowerCase()))
-      ) {
-        ctx.addIssue({
-          code: z.ZodIssueCode.custom,
-          message:
-            "providerSpecificData.requestDefaults.serviceTier must be one of default, priority, fast, flex when provided",
-          path: ["requestDefaults", "serviceTier"],
-        });
-      }
-
-      const context1m = requestDefaultsRecord.context1m;
-      if (context1m !== undefined && context1m !== null && typeof context1m !== "boolean") {
-        ctx.addIssue({
-          code: z.ZodIssueCode.custom,
-          message: "providerSpecificData.requestDefaults.context1m must be a boolean",
-          path: ["requestDefaults", "context1m"],
-        });
-      }
-    }
-  }
-
-  // [Oracle CONDITIONAL] consoleApiKey는 bailian-coding-plan 전용 필드.
-  // 다른 프로바이더 공통 규약으로 재사용하지 않는다.
-  const consoleApiKey = data.consoleApiKey;
-  if (consoleApiKey !== undefined && consoleApiKey !== null && typeof consoleApiKey !== "string") {
-    ctx.addIssue({
-      code: z.ZodIssueCode.custom,
-      message: "providerSpecificData.consoleApiKey must be a string",
-      path: ["consoleApiKey"],
-    });
-  }
-  if (typeof consoleApiKey === "string" && consoleApiKey.length > 10000) {
-    ctx.addIssue({
-      code: z.ZodIssueCode.custom,
-      message: "providerSpecificData.consoleApiKey must be at most 10000 characters",
-      path: ["consoleApiKey"],
-    });
-  }
-
-  const groupTag = data.tag;
-  if (
-    groupTag !== undefined &&
-    groupTag !== null &&
-    (typeof groupTag !== "string" || groupTag.length > 100)
-  ) {
-    ctx.addIssue({
-      code: z.ZodIssueCode.custom,
-      message: "providerSpecificData.tag must be a string up to 100 chars",
-      path: ["tag"],
-    });
-  }
-
-  const routingTags = data.tags;
-  if (routingTags !== undefined && routingTags !== null) {
-    if (!Array.isArray(routingTags) || routingTags.length > 50) {
-      ctx.addIssue({
-        code: z.ZodIssueCode.custom,
-        message: "providerSpecificData.tags must be an array with at most 50 items",
-        path: ["tags"],
-      });
-    } else if (
-      routingTags.some(
-        (tag) => typeof tag !== "string" || tag.trim().length === 0 || tag.trim().length > 64
-      )
-    ) {
-      ctx.addIssue({
-        code: z.ZodIssueCode.custom,
-        message:
-          "providerSpecificData.tags must contain non-empty strings up to 64 characters each",
-        path: ["tags"],
-      });
-    }
-  }
-
-  const excludedModels = data.excludedModels ?? data.excluded_models;
-  if (excludedModels !== undefined && excludedModels !== null) {
-    if (typeof excludedModels === "string") {
-      if (excludedModels.length > 5000) {
-        ctx.addIssue({
-          code: z.ZodIssueCode.custom,
-          message: "providerSpecificData.excludedModels string must be up to 5000 chars",
-          path: ["excludedModels"],
-        });
-      }
-    } else if (!Array.isArray(excludedModels) || excludedModels.length > 100) {
-      ctx.addIssue({
-        code: z.ZodIssueCode.custom,
-        message: "providerSpecificData.excludedModels must be an array with at most 100 items",
-        path: ["excludedModels"],
-      });
-    } else if (
-      excludedModels.some(
-        (pattern) =>
-          typeof pattern !== "string" ||
-          pattern.trim().length === 0 ||
-          pattern.trim().length > 200 ||
-          pattern.trim() === "**"
-      )
-    ) {
-      ctx.addIssue({
-        code: z.ZodIssueCode.custom,
-        message:
-          "providerSpecificData.excludedModels must contain non-empty patterns up to 200 characters",
-        path: ["excludedModels"],
-      });
-    }
-  }
-
-  const clientProfile = data.clientProfile;
-  if (clientProfile !== undefined && clientProfile !== null) {
-    const normalized = typeof clientProfile === "string" ? clientProfile.trim().toLowerCase() : "";
-    if (
-      typeof clientProfile !== "string" ||
-      !["ide", "harness", "cli", "sdk"].includes(normalized)
-    ) {
-      ctx.addIssue({
-        code: z.ZodIssueCode.custom,
-        message:
-          "providerSpecificData.clientProfile must be ide, harness, cli, or sdk (cli/sdk map to harness)",
-        path: ["clientProfile"],
-      });
-    }
-  }
-}
+import { validateProviderSpecificData } from "./providerSpecificData";
 
 // Re-export validation helpers from dedicated module to avoid webpack barrel-file
 // optimization bug that truncates exports from large files.
diff --git a/tests/unit/executor-default-base.test.ts b/tests/unit/executor-default-base.test.ts
index 1cbe3e0e86..45aa954caf 100644
--- a/tests/unit/executor-default-base.test.ts
+++ b/tests/unit/executor-default-base.test.ts
@@ -103,10 +103,7 @@ test("DefaultExecutor.buildUrl uses full chat endpoints for hosted OpenAI-compat
     bazaarlink.buildUrl("auto:free", true),
     "https://bazaarlink.ai/api/v1/chat/completions"
   );
-  assert.equal(
-    crof.buildUrl("gpt-4.1", true),
-    "https://crof.ai/v1/chat/completions"
-  );
+  assert.equal(crof.buildUrl("gpt-4.1", true), "https://crof.ai/v1/chat/completions");
 });
 
 test("DefaultExecutor.buildUrl handles openai-compatible and anthropic-compatible providers", () => {
@@ -742,6 +739,44 @@ test("DefaultExecutor.transformRequest respects disableStreamOptions for OpenAI
   assert.deepEqual((chatResultEnabled as any).stream_options, { include_usage: true });
 });
 
+test("DefaultExecutor.transformRequest injects OpenRouter connection preset", () => {
+  const executor = new DefaultExecutor("openrouter");
+  const body = { model: "openai/gpt-4", messages: [{ role: "user", content: "hi" }] };
+
+  const result = executor.transformRequest("openai/gpt-4", body, true, {
+    providerSpecificData: { preset: "  email-copywriter  " },
+  });
+
+  assert.equal((result as any).preset, "email-copywriter");
+  assert.deepEqual((result as any).stream_options, { include_usage: true });
+  assert.equal((body as any).preset, undefined);
+
+  const explicit = executor.transformRequest(
+    "openai/gpt-4",
+    { ...body, preset: "client-preset" },
+    true,
+    { providerSpecificData: { preset: "connection-preset" } }
+  );
+
+  assert.equal((explicit as any).preset, "client-preset");
+
+  const explicitNull = executor.transformRequest("openai/gpt-4", { ...body, preset: null }, true, {
+    providerSpecificData: { preset: "connection-preset" },
+  });
+  assert.equal((explicitNull as any).preset, null);
+
+  const explicitEmpty = executor.transformRequest("openai/gpt-4", { ...body, preset: "" }, true, {
+    providerSpecificData: { preset: "connection-preset" },
+  });
+  assert.equal((explicitEmpty as any).preset, "");
+
+  const blank = executor.transformRequest("openai/gpt-4", body, true, {
+    providerSpecificData: { preset: "   " },
+  });
+
+  assert.equal((blank as any).preset, undefined);
+});
+
 test("DefaultExecutor.transformRequest strips stream_options from Anthropic-compatible targets", () => {
   const anthropicCompat = new DefaultExecutor("anthropic-compatible-test");
   const anthropicCcCompat = new DefaultExecutor("anthropic-compatible-cc-test");
diff --git a/tests/unit/provider-specific-data-schema.test.ts b/tests/unit/provider-specific-data-schema.test.ts
index e8dbfa64e1..08f76391ee 100644
--- a/tests/unit/provider-specific-data-schema.test.ts
+++ b/tests/unit/provider-specific-data-schema.test.ts
@@ -127,3 +127,47 @@ test("provider schemas reject unknown Codex service tiers", () => {
   assert.equal(created.success, false);
   assert.equal(updated.success, false);
 });
+
+test("provider schemas accept OpenRouter preset in providerSpecificData", () => {
+  const created = createProviderSchema.safeParse({
+    provider: "openrouter",
+    apiKey: "token",
+    name: "OpenRouter",
+    providerSpecificData: {
+      preset: "email-copywriter",
+    },
+  });
+  const updated = updateProviderConnectionSchema.safeParse({
+    providerSpecificData: {
+      preset: "code-reviewer",
+    },
+  });
+  const padded = updateProviderConnectionSchema.safeParse({
+    providerSpecificData: {
+      preset: `${" ".repeat(120)}prefer${" ".repeat(120)}`,
+    },
+  });
+
+  assert.equal(created.success, true);
+  assert.equal(updated.success, true);
+  assert.equal(padded.success, true);
+});
+
+test("provider schemas reject oversized OpenRouter preset values", () => {
+  const created = createProviderSchema.safeParse({
+    provider: "openrouter",
+    apiKey: "token",
+    name: "OpenRouter",
+    providerSpecificData: {
+      preset: "x".repeat(201),
+    },
+  });
+  const updated = updateProviderConnectionSchema.safeParse({
+    providerSpecificData: {
+      preset: 123,
+    },
+  });
+
+  assert.equal(created.success, false);
+  assert.equal(updated.success, false);
+});
diff --git a/tests/unit/request-defaults-store-session.test.ts b/tests/unit/request-defaults-store-session.test.ts
index 1aa04506aa..64057ba66b 100644
--- a/tests/unit/request-defaults-store-session.test.ts
+++ b/tests/unit/request-defaults-store-session.test.ts
@@ -70,3 +70,37 @@ test("normalizeProviderSpecificData keeps only boolean CC-compatible 1M request
     customFlag: "keep-me",
   });
 });
+
+test("normalizeProviderSpecificData trims OpenRouter preset and clears empty values", () => {
+  const normalized = normalizeProviderSpecificData("openrouter", {
+    preset: "  email-copywriter  ",
+    tag: "primary",
+  });
+
+  assert.equal(normalized?.preset, "email-copywriter");
+  assert.equal(normalized?.tag, "primary");
+
+  const stripped = normalizeProviderSpecificData("openrouter", {
+    preset: "   ",
+    tag: "primary",
+  });
+
+  assert.equal(stripped?.preset, undefined);
+  assert.equal(stripped?.tag, "primary");
+
+  const oversized = normalizeProviderSpecificData("openrouter", {
+    preset: "x".repeat(201),
+    tag: "primary",
+  });
+
+  assert.equal(oversized?.preset, undefined);
+  assert.equal(oversized?.tag, "primary");
+
+  const ignored = normalizeProviderSpecificData("openai", {
+    preset: "email-copywriter",
+    tag: "primary",
+  });
+
+  assert.equal(ignored?.preset, undefined);
+  assert.equal(ignored?.tag, "primary");
+});