diff --git a/open-sse/config/providerRegistry.ts b/open-sse/config/providerRegistry.ts
index 69841c055c..df443a6f7b 100644
--- a/open-sse/config/providerRegistry.ts
+++ b/open-sse/config/providerRegistry.ts
@@ -181,6 +181,29 @@ export function getRegistryEntry(provider: string): RegistryEntry | null {
   return REGISTRY[provider] || _byAlias.get(provider) || null;
 }
 
+/** Resolve only a model's explicit reasoning vocabulary. */
+export function getRegistryModelThinkingEfforts(
+  provider: string,
+  modelId: string
+): readonly string[] | undefined {
+  const entry = getRegistryEntry(provider);
+  if (!entry) return undefined;
+  const model = entry.models.find((candidate) => candidate.id === modelId);
+  return model?.supportedThinkingEfforts;
+}
+
+/** Resolve a model's explicit reasoning vocabulary before its provider fallback. */
+export function getRegistryThinkingEfforts(
+  provider: string,
+  modelId: string
+): readonly string[] | undefined {
+  const entry = getRegistryEntry(provider);
+  if (!entry) return undefined;
+  const modelEfforts = getRegistryModelThinkingEfforts(provider, modelId);
+  if (modelEfforts !== undefined) return modelEfforts;
+  return entry.defaultSupportedThinkingEfforts;
+}
+
 /**
  * Decide whether a non-empty live catalog may exclude omitted static models
  * during request routing and wildcard expansion.
diff --git a/open-sse/config/providers/registry/ollama-cloud/index.ts b/open-sse/config/providers/registry/ollama-cloud/index.ts
index 4cf020263a..fb68aae61e 100644
--- a/open-sse/config/providers/registry/ollama-cloud/index.ts
+++ b/open-sse/config/providers/registry/ollama-cloud/index.ts
@@ -9,6 +9,7 @@ export const ollama_cloudProvider: RegistryEntry = {
   modelsUrl: "https://ollama.com/api/tags",
   authType: "apikey",
   authHeader: "bearer",
+  defaultSupportedThinkingEfforts: ["none", "low", "medium", "high", "max"],
   // Note: rate limits vary by plan (free = "Light usage", Pro = more, Max = 5x Pro).
   // Users can generate API keys at https://ollama.com/settings/keys
   models: [
@@ -24,23 +25,20 @@ export const ollama_cloudProvider: RegistryEntry = {
       supportsReasoning: true,
       supportedThinkingEfforts: ["low", "medium", "high"],
     },
-    // #10788: Ollama Cloud accepts low|medium|high|max|none uniformly across
-    // its reasoning-capable models (see supportsMaxEffortForProvider's
-    // isOllamaCloud comment in open-sse/executors/base/reasoningEffort.ts) —
-    // declare supportedThinkingEfforts so appendSyncedEffortVariants() (which
-    // runs before static-model capability enrichment) can synthesize the
-    // catalog's selectable -low/-high/-max variant ids for these models.
+    // #10788: these models accept none|low|medium|high|max. Keep their explicit
+    // declarations aligned with the provider fallback so the static and synced
+    // catalog paths expose the same native vocabulary.
     {
       id: "deepseek-v4-pro",
       name: "DeepSeek V4 Pro",
       supportsReasoning: true,
-      supportedThinkingEfforts: ["low", "medium", "high", "max"],
+      supportedThinkingEfforts: ["none", "low", "medium", "high", "max"],
     },
     {
       id: "deepseek-v4-flash",
       name: "DeepSeek V4 Flash",
       supportsReasoning: true,
-      supportedThinkingEfforts: ["low", "medium", "high", "max"],
+      supportedThinkingEfforts: ["none", "low", "medium", "high", "max"],
     },
     { id: "kimi-k2.6", name: "Kimi K2.6" },
     // Ollama Cloud accepts low|medium|high|max|none and rejects xhigh, so the
@@ -50,14 +48,14 @@ export const ollama_cloudProvider: RegistryEntry = {
       name: "GLM 5.1",
       supportsReasoning: true,
       supportsXHighEffort: false,
-      supportedThinkingEfforts: ["low", "medium", "high", "max"],
+      supportedThinkingEfforts: ["none", "low", "medium", "high", "max"],
     },
     {
       id: "glm-5.2",
       name: "GLM 5.2",
       supportsReasoning: true,
       supportsXHighEffort: false,
-      supportedThinkingEfforts: ["low", "medium", "high", "max"],
+      supportedThinkingEfforts: ["none", "low", "medium", "high", "max"],
     },
     // #3110: MiniMax M3 via Ollama
     { id: "minimax-m3", name: "MiniMax M3", contextLength: 1048576, supportsVision: true },
diff --git a/open-sse/config/providers/shared.ts b/open-sse/config/providers/shared.ts
index db4b9a4d5b..16c0c09b41 100644
--- a/open-sse/config/providers/shared.ts
+++ b/open-sse/config/providers/shared.ts
@@ -139,6 +139,9 @@ export interface RegistryEntry {
   requestDefaults?: ProviderRequestDefaults;
   oauth?: RegistryOAuth;
   models: RegistryModel[];
+  /** Provider-native reasoning vocabulary for reasoning-capable passthrough models
+   * that do not have an explicit per-model declaration. */
+  defaultSupportedThinkingEfforts?: readonly string[];
   modelsUrl?: string;
   /** Prefix to prepend to model IDs before upstream API calls (e.g. "accounts/fireworks/models/") */
   modelIdPrefix?: string;
diff --git a/src/app/api/v1/models/catalog.ts b/src/app/api/v1/models/catalog.ts
index 78fd327009..ee01af6098 100644
--- a/src/app/api/v1/models/catalog.ts
+++ b/src/app/api/v1/models/catalog.ts
@@ -28,7 +28,11 @@ import { getAllAudioModels } from "@omniroute/open-sse/config/audioRegistry";
 import { getAllModerationModels } from "@omniroute/open-sse/config/moderationRegistry";
 import { getAllVideoModels } from "@omniroute/open-sse/config/videoRegistry";
 import { getAllMusicModels } from "@omniroute/open-sse/config/musicRegistry";
-import { REGISTRY } from "@omniroute/open-sse/config/providerRegistry";
+import {
+  getRegistryModelThinkingEfforts,
+  getRegistryThinkingEfforts,
+  REGISTRY,
+} from "@omniroute/open-sse/config/providerRegistry";
 import { CODEX_NATIVE_UNPREFIXED_MODELS } from "@omniroute/open-sse/services/model";
 import { isModelSelectable } from "@omniroute/open-sse/services/modelLifecycle";
 import { resolveNestedComboTargets } from "@omniroute/open-sse/services/combo";
@@ -585,7 +589,9 @@ async function buildUnifiedModelsResponseCore(
               modelId,
               target,
               eligibleConnectionIds,
-              connectionCatalog || {}
+              connectionCatalog || {},
+              getRegistryModelThinkingEfforts(providerId, modelId),
+              getRegistryThinkingEfforts(providerId, modelId)
             );
       if (
         connectionEfforts === undefined &&
@@ -669,7 +675,7 @@ async function buildUnifiedModelsResponseCore(
               providerId,
               modelId,
               canonical.capabilities.supportsThinking,
-              registryModel?.supportedThinkingEfforts,
+              getRegistryThinkingEfforts(providerId, modelId),
               true
             )
           : getThinkingCapabilityFields(
diff --git a/src/app/api/v1/models/catalogHelpers.ts b/src/app/api/v1/models/catalogHelpers.ts
index 42d24fb1d8..40ecf25e85 100644
--- a/src/app/api/v1/models/catalogHelpers.ts
+++ b/src/app/api/v1/models/catalogHelpers.ts
@@ -36,6 +36,7 @@ export type ComboCatalogTarget = {
 
 type ConnectionScopedReasoningModel = {
   id: string;
+  supportsThinking?: boolean;
   supportedThinkingEfforts?: string[];
 };
 
@@ -106,7 +107,9 @@ export function getConnectionScopedEffortTiers(
   modelId: string,
   target: Pick<ComboCatalogTarget, "connectionId" | "allowedConnectionIds">,
   eligibleConnectionIds: readonly string[] | undefined,
-  modelsByConnection: ConnectionScopedReasoningCatalog
+  modelsByConnection: ConnectionScopedReasoningCatalog,
+  explicitThinkingEfforts?: readonly string[],
+  fallbackThinkingEfforts?: readonly string[]
 ): string[] | undefined {
   const eligible = eligibleConnectionIds ? new Set(eligibleConnectionIds) : undefined;
   if (target.connectionId && eligible && !eligible.has(target.connectionId)) return [];
@@ -139,7 +142,16 @@ export function getConnectionScopedEffortTiers(
   );
   if (matching.some((model) => model === undefined)) return [];
 
-  const efforts = matching.map((model) => model?.supportedThinkingEfforts || []);
+  const efforts = matching.map((model) => {
+    const resolved = model?.supportedThinkingEfforts?.length
+      ? model.supportedThinkingEfforts
+      : model?.supportsThinking === true && fallbackThinkingEfforts
+        ? [...fallbackThinkingEfforts]
+        : [];
+    return explicitThinkingEfforts
+      ? explicitThinkingEfforts.filter((effort) => resolved.includes(effort))
+      : resolved;
+  });
   return intersectStringArrays(efforts);
 }
 
diff --git a/src/app/api/v1/models/syncedCapabilities.ts b/src/app/api/v1/models/syncedCapabilities.ts
index bf82f0f980..529753a8d9 100644
--- a/src/app/api/v1/models/syncedCapabilities.ts
+++ b/src/app/api/v1/models/syncedCapabilities.ts
@@ -27,9 +27,14 @@
 // refactors. (Confirmed convention: grep "from \"@omniroute/open-sse" src/app/api/v1/models/)
 import { getLearnedReasoningEffortForModel } from "@omniroute/open-sse/services/learnedReasoningEffortCaps.ts";
 import { isSkippedEffortProvider } from "@omniroute/open-sse/utils/syncedEffortVariants.ts";
+import {
+  getRegistryModelThinkingEfforts,
+  getRegistryThinkingEfforts,
+} from "@omniroute/open-sse/config/providerRegistry.ts";
 
 interface SyncedCapabilityFlags {
   id?: string;
+  supportsThinking?: boolean;
   supportsVision?: boolean;
   supportedThinkingEfforts?: string[];
 }
@@ -37,10 +42,23 @@ interface SyncedCapabilityFlags {
 function effectiveEffortTiers(sm: SyncedCapabilityFlags, ownedBy: string): string[] | undefined {
   if (isSkippedEffortProvider(ownedBy)) return undefined;
   const learned = sm.id ? getLearnedReasoningEffortForModel(sm.id) : null;
+  const synced =
+    Array.isArray(sm.supportedThinkingEfforts) && sm.supportedThinkingEfforts.length > 0
+      ? sm.supportedThinkingEfforts
+      : null;
+  const explicit = sm.id ? getRegistryModelThinkingEfforts(ownedBy, sm.id) : undefined;
+  if (explicit) {
+    const observed = learned ? [...learned] : synced;
+    const narrowed = observed
+      ? explicit.filter((effort) => observed.includes(effort))
+      : [...explicit];
+    return narrowed.length > 0 ? narrowed : undefined;
+  }
   if (learned) return [...learned];
-  return Array.isArray(sm.supportedThinkingEfforts) && sm.supportedThinkingEfforts.length > 0
-    ? sm.supportedThinkingEfforts
-    : undefined;
+  if (synced) return synced;
+  if (!sm.supportsThinking || !sm.id) return undefined;
+  const registryEfforts = getRegistryThinkingEfforts(ownedBy, sm.id);
+  return registryEfforts && registryEfforts.length > 0 ? [...registryEfforts] : undefined;
 }
 
 /** Build the `capabilities` object for a fresh synced-model catalog entry, or `undefined` when neither flag applies. */
diff --git a/tests/unit/models-catalog-combo-metadata.test.ts b/tests/unit/models-catalog-combo-metadata.test.ts
index c80253c314..1ab884f3d3 100644
--- a/tests/unit/models-catalog-combo-metadata.test.ts
+++ b/tests/unit/models-catalog-combo-metadata.test.ts
@@ -567,3 +567,64 @@ test("mixed DeepSeek combos advertise the efforts accepted by every V4 target",
     ]);
   }
 });
+
+test("Ollama Cloud projects native efforts for base, tagged, and combo models", async () => {
+  const provider = "ollama-cloud";
+  const baseModel = "deepseek-v4-flash";
+  const taggedModel = "deepseek-v4-flash:0731";
+  const narrowModel = "gpt-oss:20b";
+  const nativeEfforts = ["none", "low", "medium", "high", "max"];
+  const narrowEfforts = ["low", "medium", "high"];
+  const connection = await providersDb.createProviderConnection({
+    provider,
+    authType: "apikey",
+    name: "ollama-cloud-native-efforts",
+    apiKey: "ollama-cloud-test-key",
+    isActive: true,
+    testStatus: "active",
+  });
+  await modelsDb.replaceSyncedAvailableModelsForConnection(provider, connection.id, [
+    { id: baseModel, name: "DeepSeek V4 Flash", supportsThinking: true },
+    { id: taggedModel, name: "DeepSeek V4 Flash 0731", supportsThinking: true },
+    {
+      id: narrowModel,
+      name: "GPT-OSS 20B",
+      supportsThinking: true,
+      supportedThinkingEfforts: nativeEfforts,
+    },
+  ]);
+  await combosDb.createCombo({
+    name: "ollama-cloud-native-efforts-combo",
+    strategy: "auto",
+    models: [`${provider}/${baseModel}`, `${provider}/${taggedModel}`],
+  });
+  await combosDb.createCombo({
+    name: "ollama-cloud-narrow-efforts-combo",
+    strategy: "auto",
+    models: [`${provider}/${narrowModel}`],
+  });
+
+  const response = await catalog.getUnifiedModelsResponse(
+    new Request("http://localhost/api/v1/models")
+  );
+  const body = (await response.json()) as { data: Array<Record<string, unknown>> };
+  const capabilitiesFor = (modelId: string) => {
+    const model = body.data.find((item) => item.id === modelId);
+    assert.ok(model, modelId);
+    return model.capabilities as Record<string, unknown>;
+  };
+
+  assert.equal(response.status, 200);
+  for (const modelId of [
+    `ollamacloud/${baseModel}`,
+    `ollamacloud/${taggedModel}`,
+    "ollama-cloud-native-efforts-combo",
+  ]) {
+    const effortTiers = capabilitiesFor(modelId).effort_tiers;
+    assert.deepEqual(effortTiers, nativeEfforts, modelId);
+    assert.equal((effortTiers as string[]).includes("xhigh"), false, modelId);
+  }
+  for (const modelId of [`ollamacloud/${narrowModel}`, "ollama-cloud-narrow-efforts-combo"]) {
+    assert.deepEqual(capabilitiesFor(modelId).effort_tiers, narrowEfforts, modelId);
+  }
+});
diff --git a/tests/unit/ollama-cloud-reasoning-effort-tiers-10788.test.ts b/tests/unit/ollama-cloud-reasoning-effort-tiers-10788.test.ts
index ae7506cbf1..599408ce67 100644
--- a/tests/unit/ollama-cloud-reasoning-effort-tiers-10788.test.ts
+++ b/tests/unit/ollama-cloud-reasoning-effort-tiers-10788.test.ts
@@ -1,6 +1,7 @@
 import { test } from "node:test";
 import assert from "node:assert/strict";
 import { ollama_cloudProvider } from "../../open-sse/config/providers/registry/ollama-cloud/index.ts";
+import { getRegistryThinkingEfforts } from "../../open-sse/config/providerRegistry.ts";
 
 // #10788: ollama-cloud declared supportsReasoning:true on several models
 // (glm-5.1/5.2, deepseek-v4-pro/flash) but never declared
@@ -19,6 +20,7 @@ test("#10788: ollama-cloud reasoning-capable models declare supportedThinkingEff
     Array.isArray(control?.supportedThinkingEfforts) && control.supportedThinkingEfforts.length > 0,
     "control: gpt-oss:20b should already declare supportedThinkingEfforts"
   );
+  assert.deepEqual(control.supportedThinkingEfforts, ["low", "medium", "high"]);
 
   const reasoningModelIds = ["glm-5.1", "glm-5.2", "deepseek-v4-pro", "deepseek-v4-flash"];
   for (const id of reasoningModelIds) {
@@ -33,8 +35,29 @@ test("#10788: ollama-cloud reasoning-capable models declare supportedThinkingEff
     // low|medium|high|max|none — xhigh is rejected and mapped to max.
     assert.deepEqual(
       [...(model?.supportedThinkingEfforts ?? [])],
-      ["low", "medium", "high", "max"],
-      `${id} should declare Ollama Cloud's documented low/medium/high/max vocabulary`
+      ["none", "low", "medium", "high", "max"],
+      `${id} should declare Ollama Cloud's documented none/low/medium/high/max vocabulary`
     );
   }
 });
+
+test("#10788: provider fallback preserves explicit and unrelated vocabularies", () => {
+  assert.deepEqual(getRegistryThinkingEfforts("ollama-cloud", "deepseek-v4-flash:0731"), [
+    "none",
+    "low",
+    "medium",
+    "high",
+    "max",
+  ]);
+  assert.deepEqual(getRegistryThinkingEfforts("ollama-cloud", "gpt-oss:20b"), [
+    "low",
+    "medium",
+    "high",
+  ]);
+  assert.deepEqual(getRegistryThinkingEfforts("deepseek", "deepseek-v4-flash"), [
+    "none",
+    "low",
+    "high",
+    "max",
+  ]);
+});