diff --git a/docs/ARCHITECTURE.md b/docs/ARCHITECTURE.md
index dc9146bd3a..80960c7212 100644
--- a/docs/ARCHITECTURE.md
+++ b/docs/ARCHITECTURE.md
@@ -765,8 +765,8 @@ Detailed request payload capture stores up to four JSON payload stages per route
 
 - raw request received from the client
 - translated request actually sent upstream
-- provider response reconstructed as JSON (including streamed event sequences when applicable)
-- final client response returned by OmniRoute
+- provider response reconstructed as JSON; streamed responses are compacted to the final summary plus stream metadata
+- final client response returned by OmniRoute; streamed responses are stored in the same compact summary form
 
 ## Security-Sensitive Boundaries
 
diff --git a/open-sse/utils/stream.ts b/open-sse/utils/stream.ts
index b8c788036e..4c30fe3782 100644
--- a/open-sse/utils/stream.ts
+++ b/open-sse/utils/stream.ts
@@ -11,7 +11,10 @@ import {
   COLORS,
 } from "./usageTracking.ts";
 import { parseSSELine, hasValuableContent, fixInvalidId, formatSSE } from "./streamHelpers.ts";
-import { createStructuredSSECollector } from "./streamPayloadCollector.ts";
+import {
+  createStructuredSSECollector,
+  buildStreamSummaryFromEvents,
+} from "./streamPayloadCollector.ts";
 import { STREAM_IDLE_TIMEOUT_MS, HTTP_STATUS } from "../config/constants.ts";
 import {
   sanitizeStreamingChunk,
@@ -655,8 +658,17 @@ export function createSSEStream(options: StreamOptions = {}) {
                   status: 200,
                   usage,
                   responseBody,
-                  providerPayload: providerPayloadCollector.build(),
-                  clientPayload: clientPayloadCollector.build(responseBody),
+                  providerPayload: providerPayloadCollector.build(
+                    buildStreamSummaryFromEvents(
+                      providerPayloadCollector.getEvents(),
+                      sourceFormat,
+                      model
+                    ),
+                    { includeEvents: false }
+                  ),
+                  clientPayload: clientPayloadCollector.build(responseBody, {
+                    includeEvents: false,
+                  }),
                 });
               } catch {}
             }
@@ -811,8 +823,17 @@ export function createSSEStream(options: StreamOptions = {}) {
                 status: 200,
                 usage: state?.usage,
                 responseBody,
-                providerPayload: providerPayloadCollector.build(),
-                clientPayload: clientPayloadCollector.build(responseBody),
+                providerPayload: providerPayloadCollector.build(
+                  buildStreamSummaryFromEvents(
+                    providerPayloadCollector.getEvents(),
+                    targetFormat,
+                    model
+                  ),
+                  { includeEvents: false }
+                ),
+                clientPayload: clientPayloadCollector.build(responseBody, {
+                  includeEvents: false,
+                }),
               });
             } catch {}
           }
diff --git a/open-sse/utils/streamPayloadCollector.ts b/open-sse/utils/streamPayloadCollector.ts
index c5d1446c22..961dfc46ba 100644
--- a/open-sse/utils/streamPayloadCollector.ts
+++ b/open-sse/utils/streamPayloadCollector.ts
@@ -1,4 +1,5 @@
 import { cloneLogPayload } from "@/lib/logPayloads";
+import { FORMATS } from "../translator/formats.ts";
 
 type StructuredSSEEvent = {
   index: number;
@@ -12,6 +13,12 @@ type CollectorOptions = {
   stage?: string;
 };
 
+type BuildOptions = {
+  includeEvents?: boolean;
+};
+
+type JsonRecord = Record<string, unknown>;
+
 function getEventName(payload: unknown): string | undefined {
   if (!payload || typeof payload !== "object" || Array.isArray(payload)) return undefined;
 
@@ -27,6 +34,592 @@ function getEventName(payload: unknown): string | undefined {
   return undefined;
 }
 
+function asRecord(value: unknown): JsonRecord {
+  return value && typeof value === "object" && !Array.isArray(value) ? (value as JsonRecord) : {};
+}
+
+function toString(value: unknown, fallback = ""): string {
+  return typeof value === "string" ? value : fallback;
+}
+
+function toNumber(value: unknown, fallback = 0): number {
+  if (typeof value === "number" && Number.isFinite(value)) return value;
+  if (typeof value === "string" && value.trim().length > 0) {
+    const parsed = Number(value);
+    return Number.isFinite(parsed) ? parsed : fallback;
+  }
+  return fallback;
+}
+
+function normalizeFormat(format?: string | null): string {
+  if (!format) return "";
+  if (format === FORMATS.OPENAI_RESPONSE) return FORMATS.OPENAI_RESPONSES;
+  return format;
+}
+
+function inferFormatFromEvents(
+  events: StructuredSSEEvent[],
+  fallbackFormat?: string | null
+): string {
+  const normalizedFallback = normalizeFormat(fallbackFormat);
+  if (normalizedFallback) return normalizedFallback;
+
+  for (const evt of events) {
+    const payload = asRecord(evt.data);
+    const eventType = toString(payload.type || evt.event);
+
+    if (eventType.startsWith("response.") || payload.object === "response") {
+      return FORMATS.OPENAI_RESPONSES;
+    }
+    if (
+      eventType === "message_start" ||
+      eventType === "content_block_start" ||
+      eventType === "content_block_delta" ||
+      eventType === "message_delta" ||
+      eventType === "message_stop" ||
+      eventType === "ping"
+    ) {
+      return FORMATS.CLAUDE;
+    }
+    if (Array.isArray(payload.candidates) || payload.usageMetadata) {
+      return FORMATS.GEMINI;
+    }
+  }
+
+  return FORMATS.OPENAI;
+}
+
+function mergeUsage(target: JsonRecord, incoming: unknown) {
+  const usage = asRecord(incoming);
+  for (const [key, value] of Object.entries(usage)) {
+    if (typeof value === "number" && Number.isFinite(value)) {
+      if ((target[key] as number | undefined) === undefined || value > 0) {
+        target[key] = value;
+      }
+    } else if (value && typeof value === "object" && !Array.isArray(value)) {
+      target[key] = { ...asRecord(target[key]), ...asRecord(value) };
+    } else if (typeof value === "string" && value.trim().length > 0) {
+      target[key] = value;
+    }
+  }
+}
+
+function tryParseJson(raw: string): unknown {
+  try {
+    return JSON.parse(raw);
+  } catch {
+    return raw;
+  }
+}
+
+function buildOpenAISummary(events: StructuredSSEEvent[], fallbackModel?: string | null): unknown {
+  const payloads = events
+    .map((evt) => asRecord(evt.data))
+    .filter((payload) => Object.keys(payload).length);
+  if (payloads.length === 0) return null;
+
+  const first = payloads[0];
+  const contentParts: string[] = [];
+  const reasoningParts: string[] = [];
+  type ToolCall = {
+    id: string | null;
+    index: number;
+    type: string;
+    function: { name: string; arguments: string };
+  };
+  const toolCalls = new Map<string, ToolCall>();
+  let unknownToolCallSeq = 0;
+  let finishReason = "stop";
+  let usage: JsonRecord | null = null;
+
+  const getToolCallKey = (toolCall: JsonRecord) => {
+    if (Number.isInteger(toolCall.index)) return `idx:${toolCall.index}`;
+    if (toolCall.id) return `id:${toolCall.id}`;
+    unknownToolCallSeq += 1;
+    return `seq:${unknownToolCallSeq}`;
+  };
+
+  for (const chunk of payloads) {
+    const choice = asRecord(Array.isArray(chunk.choices) ? chunk.choices[0] : null);
+    const delta = asRecord(choice.delta);
+
+    if (typeof delta.content === "string" && delta.content.length > 0) {
+      contentParts.push(delta.content);
+    }
+    if (Array.isArray(delta.content)) {
+      for (const part of delta.content) {
+        const partObj = asRecord(part);
+        if (typeof partObj.text === "string" && partObj.text.length > 0) {
+          contentParts.push(partObj.text);
+        }
+      }
+    }
+    if (typeof delta.reasoning_content === "string" && delta.reasoning_content.length > 0) {
+      reasoningParts.push(delta.reasoning_content);
+    }
+
+    if (Array.isArray(delta.tool_calls)) {
+      for (const item of delta.tool_calls) {
+        const toolCall = asRecord(item);
+        const key = getToolCallKey(toolCall);
+        const existing = toolCalls.get(key);
+        const deltaArgs =
+          typeof asRecord(toolCall.function).arguments === "string"
+            ? String(asRecord(toolCall.function).arguments)
+            : "";
+
+        if (!existing) {
+          toolCalls.set(key, {
+            id: typeof toolCall.id === "string" ? toolCall.id : null,
+            index: Number.isInteger(toolCall.index) ? Number(toolCall.index) : toolCalls.size,
+            type: toString(toolCall.type, "function"),
+            function: {
+              name: toString(asRecord(toolCall.function).name, "unknown"),
+              arguments: deltaArgs,
+            },
+          });
+          continue;
+        }
+
+        existing.id = existing.id || (typeof toolCall.id === "string" ? toolCall.id : null);
+        if (
+          (!Number.isInteger(existing.index) || existing.index < 0) &&
+          Number.isInteger(toolCall.index)
+        ) {
+          existing.index = Number(toolCall.index);
+        }
+        if (typeof asRecord(toolCall.function).name === "string" && !existing.function.name) {
+          existing.function.name = String(asRecord(toolCall.function).name);
+        }
+        existing.function.arguments += deltaArgs;
+      }
+    }
+
+    if (typeof choice.finish_reason === "string" && choice.finish_reason.length > 0) {
+      finishReason = choice.finish_reason;
+    }
+    if (chunk.usage && typeof chunk.usage === "object") {
+      usage = { ...asRecord(chunk.usage) };
+    }
+  }
+
+  const message: JsonRecord = {
+    role: "assistant",
+    content: contentParts.length > 0 ? contentParts.join("") : null,
+  };
+  if (reasoningParts.length > 0) {
+    message.reasoning_content = reasoningParts.join("");
+  }
+
+  const finalToolCalls = [...toolCalls.values()].sort((a, b) => a.index - b.index);
+  if (finalToolCalls.length > 0) {
+    finishReason = "tool_calls";
+    message.tool_calls = finalToolCalls;
+  }
+
+  const result: JsonRecord = {
+    id: toString(first.id, `chatcmpl-${Date.now()}`),
+    object: "chat.completion",
+    created: toNumber(first.created, Math.floor(Date.now() / 1000)),
+    model: toString(first.model, fallbackModel || "unknown"),
+    choices: [
+      {
+        index: 0,
+        message,
+        finish_reason: finishReason,
+      },
+    ],
+  };
+
+  if (usage && Object.keys(usage).length > 0) {
+    result.usage = usage;
+  }
+
+  return result;
+}
+
+function buildResponsesSummary(
+  events: StructuredSSEEvent[],
+  fallbackModel?: string | null
+): unknown {
+  const payloads = events
+    .map((evt) => asRecord(evt.data))
+    .filter((payload) => Object.keys(payload).length);
+  if (payloads.length === 0) return null;
+
+  let completed: JsonRecord | null = null;
+  let latestResponse: JsonRecord | null = null;
+  let usage: JsonRecord | null = null;
+  const textParts: string[] = [];
+
+  for (const payload of payloads) {
+    const eventType = toString(payload.type);
+    if (
+      eventType === "response.completed" &&
+      payload.response &&
+      typeof payload.response === "object"
+    ) {
+      completed = asRecord(payload.response);
+    }
+    if (payload.response && typeof payload.response === "object") {
+      latestResponse = asRecord(payload.response);
+    } else if (payload.object === "response") {
+      latestResponse = payload;
+    }
+    if (
+      eventType === "response.output_text.delta" &&
+      typeof payload.delta === "string" &&
+      payload.delta.length > 0
+    ) {
+      textParts.push(payload.delta);
+    }
+    if (payload.usage && typeof payload.usage === "object") {
+      usage = { ...asRecord(payload.usage) };
+    } else if (payload.response && typeof asRecord(payload.response).usage === "object") {
+      usage = { ...asRecord(asRecord(payload.response).usage) };
+    }
+  }
+
+  const picked = completed || latestResponse;
+  if (picked && Object.keys(picked).length > 0) {
+    return {
+      id: toString(picked.id, `resp_${Date.now()}`),
+      object: "response",
+      model: toString(picked.model, fallbackModel || "unknown"),
+      output: Array.isArray(picked.output) ? picked.output : [],
+      usage: picked.usage ?? usage ?? null,
+      status: toString(picked.status, completed ? "completed" : "in_progress"),
+      created_at: toNumber(picked.created_at, Math.floor(Date.now() / 1000)),
+      metadata: asRecord(picked.metadata),
+    };
+  }
+
+  return {
+    id: `resp_${Date.now()}`,
+    object: "response",
+    model: fallbackModel || "unknown",
+    output:
+      textParts.length > 0
+        ? [
+            {
+              type: "message",
+              role: "assistant",
+              content: [{ type: "output_text", text: textParts.join("") }],
+            },
+          ]
+        : [],
+    usage: usage ?? null,
+    status: "completed",
+    created_at: Math.floor(Date.now() / 1000),
+    metadata: {},
+  };
+}
+
+function buildClaudeSummary(events: StructuredSSEEvent[], fallbackModel?: string | null): unknown {
+  const payloads = events
+    .map((evt) => asRecord(evt.data))
+    .filter((payload) => Object.keys(payload).length);
+  if (payloads.length === 0) return null;
+
+  type ClaudeBlock =
+    | { type: "text"; index: number; text: string }
+    | { type: "thinking"; index: number; thinking: string; signature?: string }
+    | {
+        type: "tool_use";
+        index: number;
+        id: string;
+        name: string;
+        input: unknown;
+        inputJson: string;
+      };
+
+  const blocks = new Map<number, ClaudeBlock>();
+  const usage: JsonRecord = {};
+  let messageId = "";
+  let model = fallbackModel || "claude";
+  let role = "assistant";
+  let stopReason = "end_turn";
+  let stopSequence: string | null = null;
+
+  for (const payload of payloads) {
+    const eventType = toString(payload.type);
+    if (eventType === "message_start") {
+      const message = asRecord(payload.message);
+      messageId = toString(message.id, messageId || `msg_${Date.now()}`);
+      model = toString(message.model, model);
+      role = toString(message.role, role);
+      mergeUsage(usage, message.usage);
+      continue;
+    }
+
+    if (eventType === "content_block_start") {
+      const index = toNumber(payload.index, blocks.size);
+      const contentBlock = asRecord(payload.content_block);
+      const blockType = toString(contentBlock.type);
+
+      if (blockType === "thinking") {
+        blocks.set(index, {
+          type: "thinking",
+          index,
+          thinking: toString(contentBlock.thinking),
+          signature:
+            typeof contentBlock.signature === "string" ? contentBlock.signature : undefined,
+        });
+      } else if (blockType === "tool_use") {
+        blocks.set(index, {
+          type: "tool_use",
+          index,
+          id: toString(contentBlock.id, `toolu_${Date.now()}_${index}`),
+          name: toString(contentBlock.name),
+          input: cloneLogPayload(contentBlock.input ?? {}),
+          inputJson: "",
+        });
+      } else {
+        blocks.set(index, {
+          type: "text",
+          index,
+          text: toString(contentBlock.text),
+        });
+      }
+      continue;
+    }
+
+    if (eventType === "content_block_delta") {
+      const index = toNumber(payload.index, 0);
+      const delta = asRecord(payload.delta);
+      const deltaType = toString(delta.type);
+      const existing = blocks.get(index);
+
+      if (deltaType === "input_json_delta") {
+        const toolUse =
+          existing && existing.type === "tool_use"
+            ? existing
+            : {
+                type: "tool_use" as const,
+                index,
+                id: `toolu_${Date.now()}_${index}`,
+                name: "",
+                input: {},
+                inputJson: "",
+              };
+        toolUse.inputJson += toString(delta.partial_json);
+        blocks.set(index, toolUse);
+        continue;
+      }
+
+      if (deltaType === "thinking_delta" || typeof delta.thinking === "string") {
+        const thinking =
+          existing && existing.type === "thinking"
+            ? existing
+            : { type: "thinking" as const, index, thinking: "", signature: undefined };
+        thinking.thinking += toString(delta.thinking);
+        blocks.set(index, thinking);
+        continue;
+      }
+
+      const textBlock =
+        existing && existing.type === "text"
+          ? existing
+          : {
+              type: "text" as const,
+              index,
+              text: "",
+            };
+      textBlock.text += toString(delta.text);
+      blocks.set(index, textBlock);
+      continue;
+    }
+
+    if (eventType === "message_delta") {
+      const delta = asRecord(payload.delta);
+      stopReason = toString(delta.stop_reason, stopReason);
+      stopSequence =
+        typeof delta.stop_sequence === "string" ? String(delta.stop_sequence) : stopSequence;
+      mergeUsage(usage, payload.usage);
+      continue;
+    }
+
+    mergeUsage(usage, payload.usage);
+  }
+
+  const content = [...blocks.values()]
+    .sort((a, b) => a.index - b.index)
+    .flatMap((block) => {
+      if (block.type === "text") {
+        return block.text
+          ? [
+              {
+                type: "text",
+                text: block.text,
+              },
+            ]
+          : [];
+      }
+      if (block.type === "thinking") {
+        return block.thinking
+          ? [
+              {
+                type: "thinking",
+                thinking: block.thinking,
+                ...(block.signature ? { signature: block.signature } : {}),
+              },
+            ]
+          : [];
+      }
+
+      const parsedInput =
+        block.inputJson.trim().length > 0
+          ? tryParseJson(block.inputJson)
+          : cloneLogPayload(block.input);
+      return [
+        {
+          type: "tool_use",
+          id: block.id,
+          name: block.name,
+          input: parsedInput,
+        },
+      ];
+    });
+
+  return {
+    id: messageId || `msg_${Date.now()}`,
+    type: "message",
+    role,
+    model,
+    content,
+    stop_reason: stopReason,
+    ...(stopSequence ? { stop_sequence: stopSequence } : {}),
+    ...(Object.keys(usage).length > 0 ? { usage } : {}),
+  };
+}
+
+function buildGeminiSummary(events: StructuredSSEEvent[], fallbackModel?: string | null): unknown {
+  const payloads = events
+    .map((evt) => asRecord(evt.data))
+    .filter((payload) => Object.keys(payload).length);
+  if (payloads.length === 0) return null;
+
+  const parts: JsonRecord[] = [];
+  const usageMetadata: JsonRecord = {};
+  let modelVersion = fallbackModel || "gemini";
+  let finishReason = "STOP";
+  let role = "model";
+
+  const appendPart = (part: JsonRecord) => {
+    const last = parts[parts.length - 1];
+    if (
+      last &&
+      typeof last.text === "string" &&
+      typeof part.text === "string" &&
+      Boolean(last.thought) === Boolean(part.thought)
+    ) {
+      last.text += part.text;
+      return;
+    }
+    parts.push(part);
+  };
+
+  for (const payload of payloads) {
+    if (typeof payload.modelVersion === "string" && payload.modelVersion.length > 0) {
+      modelVersion = payload.modelVersion;
+    }
+    mergeUsage(usageMetadata, payload.usageMetadata);
+
+    const candidate = asRecord(Array.isArray(payload.candidates) ? payload.candidates[0] : null);
+    if (typeof candidate.finishReason === "string" && candidate.finishReason.length > 0) {
+      finishReason = candidate.finishReason;
+    }
+
+    const content = asRecord(candidate.content);
+    if (typeof content.role === "string" && content.role.length > 0) {
+      role = content.role;
+    }
+
+    if (!Array.isArray(content.parts)) continue;
+    for (const item of content.parts) {
+      const part = asRecord(item);
+      if (part.functionCall && typeof part.functionCall === "object") {
+        parts.push({
+          functionCall: cloneLogPayload(part.functionCall),
+        });
+      } else if (typeof part.text === "string" && part.text.length > 0) {
+        appendPart({
+          text: part.text,
+          ...(part.thought === true ? { thought: true } : {}),
+        });
+      }
+    }
+  }
+
+  return {
+    candidates: [
+      {
+        index: 0,
+        content: {
+          role,
+          parts,
+        },
+        finishReason,
+      },
+    ],
+    ...(Object.keys(usageMetadata).length > 0 ? { usageMetadata } : {}),
+    modelVersion,
+  };
+}
+
+export function buildStreamSummaryFromEvents(
+  events: StructuredSSEEvent[],
+  fallbackFormat?: string | null,
+  fallbackModel?: string | null
+): unknown {
+  const format = inferFormatFromEvents(events, fallbackFormat);
+
+  switch (format) {
+    case FORMATS.OPENAI_RESPONSES:
+      return buildResponsesSummary(events, fallbackModel);
+    case FORMATS.CLAUDE:
+      return buildClaudeSummary(events, fallbackModel);
+    case FORMATS.GEMINI:
+    case FORMATS.GEMINI_CLI:
+    case FORMATS.ANTIGRAVITY:
+      return buildGeminiSummary(events, fallbackModel);
+    default:
+      return buildOpenAISummary(events, fallbackModel);
+  }
+}
+
+export function compactStructuredStreamPayload(payload: unknown): unknown {
+  const record = asRecord(payload);
+  if (record._streamed !== true || !("summary" in record)) {
+    return payload;
+  }
+
+  const streamMeta: JsonRecord = {
+    format: toString(record._format, "sse-json"),
+    stage: toString(record._stage, "response"),
+    eventCount: toNumber(record._eventCount, 0),
+  };
+  if (record._truncated === true) {
+    streamMeta.truncated = true;
+  }
+  if (typeof record._droppedEvents === "number" && record._droppedEvents > 0) {
+    streamMeta.droppedEvents = record._droppedEvents;
+  }
+
+  const summary = cloneLogPayload(record.summary);
+  if (summary && typeof summary === "object" && !Array.isArray(summary)) {
+    return {
+      ...(summary as JsonRecord),
+      _omniroute_stream: streamMeta,
+    };
+  }
+
+  return {
+    summary,
+    _omniroute_stream: streamMeta,
+  };
+}
+
 export function createStructuredSSECollector(options: CollectorOptions = {}) {
   const { maxEvents = 200, maxBytes = 49152, stage } = options;
   const events: StructuredSSEEvent[] = [];
@@ -57,14 +650,19 @@ export function createStructuredSSECollector(options: CollectorOptions = {}) {
       events.push(event);
     },
 
-    build(summary?: unknown) {
+    getEvents() {
+      return events.map((event) => cloneLogPayload(event));
+    },
+
+    build(summary?: unknown, buildOptions: BuildOptions = {}) {
+      const { includeEvents = true } = buildOptions;
       return {
         _streamed: true,
         _format: "sse-json",
         ...(stage ? { _stage: stage } : {}),
         _eventCount: events.length + droppedEvents,
         ...(droppedEvents > 0 ? { _truncated: true, _droppedEvents: droppedEvents } : {}),
-        events,
+        ...(includeEvents ? { events } : {}),
         ...(summary === undefined ? {} : { summary: cloneLogPayload(summary) }),
       };
     },
diff --git a/src/lib/db/detailedLogs.ts b/src/lib/db/detailedLogs.ts
index 0573090227..9de0131e16 100644
--- a/src/lib/db/detailedLogs.ts
+++ b/src/lib/db/detailedLogs.ts
@@ -14,6 +14,7 @@ import {
   serializePayloadForStorage,
   parseStoredPayload,
 } from "../logPayloads";
+import { compactStructuredStreamPayload } from "@omniroute/open-sse/utils/streamPayloadCollector.ts";
 
 export interface RequestDetailLog {
   id?: string;
@@ -52,6 +53,8 @@ export function saveRequestDetailLog(entry: RequestDetailLog): void {
   const db = getDbInstance();
   const id = entry.id ?? uuidv4();
   const timestamp = entry.timestamp ?? new Date().toISOString();
+  const compactProviderResponse = compactStructuredStreamPayload(entry.provider_response);
+  const compactClientResponse = compactStructuredStreamPayload(entry.client_response);
 
   db.prepare(
     `
@@ -66,8 +69,8 @@ export function saveRequestDetailLog(entry: RequestDetailLog): void {
     timestamp,
     serializePayloadForStorage(protectPayloadForLog(entry.client_request)),
     serializePayloadForStorage(protectPayloadForLog(entry.translated_request)),
-    serializePayloadForStorage(protectPayloadForLog(entry.provider_response)),
-    serializePayloadForStorage(protectPayloadForLog(entry.client_response)),
+    serializePayloadForStorage(protectPayloadForLog(compactProviderResponse)),
+    serializePayloadForStorage(protectPayloadForLog(compactClientResponse)),
     entry.provider ?? null,
     entry.model ?? null,
     entry.source_format ?? null,
diff --git a/tests/unit/request-log-payloads.test.mjs b/tests/unit/request-log-payloads.test.mjs
index d06155456c..dc6ae405f7 100644
--- a/tests/unit/request-log-payloads.test.mjs
+++ b/tests/unit/request-log-payloads.test.mjs
@@ -7,8 +7,12 @@ const {
   serializePayloadForStorage,
   parseStoredPayload,
 } = await import("../../src/lib/logPayloads.ts");
-const { createStructuredSSECollector } =
-  await import("../../open-sse/utils/streamPayloadCollector.ts");
+const {
+  createStructuredSSECollector,
+  buildStreamSummaryFromEvents,
+  compactStructuredStreamPayload,
+} = await import("../../open-sse/utils/streamPayloadCollector.ts");
+const { FORMATS } = await import("../../open-sse/translator/formats.ts");
 
 test("normalizes JSON strings before log protection and redacts sensitive keys", () => {
   const protectedPayload = protectPayloadForLog(
@@ -63,3 +67,91 @@ test("structured SSE collector preserves event order and marks truncation", () =
   assert.equal(payload.events[1].event, "response.output_text.delta");
   assert.deepEqual(payload.summary, { done: true });
 });
+
+test("builds compact OpenAI stream summary for detailed logs", () => {
+  const collector = createStructuredSSECollector({ stage: "provider_response" });
+
+  collector.push({
+    id: "chatcmpl_1",
+    object: "chat.completion.chunk",
+    created: 123,
+    model: "gpt-4.1-mini",
+    choices: [{ index: 0, delta: { role: "assistant", content: "Hello " } }],
+  });
+  collector.push({
+    id: "chatcmpl_1",
+    object: "chat.completion.chunk",
+    created: 123,
+    model: "gpt-4.1-mini",
+    choices: [{ index: 0, delta: { content: "world" } }],
+  });
+  collector.push({
+    id: "chatcmpl_1",
+    object: "chat.completion.chunk",
+    created: 123,
+    model: "gpt-4.1-mini",
+    choices: [{ index: 0, delta: {}, finish_reason: "stop" }],
+    usage: { prompt_tokens: 5, completion_tokens: 2, total_tokens: 7 },
+  });
+
+  const summary = buildStreamSummaryFromEvents(
+    collector.getEvents(),
+    FORMATS.OPENAI,
+    "gpt-4.1-mini"
+  );
+  const compact = compactStructuredStreamPayload(
+    collector.build(summary, { includeEvents: false })
+  );
+
+  assert.equal(compact.object, "chat.completion");
+  assert.equal(compact.choices[0].message.content, "Hello world");
+  assert.equal(compact.choices[0].finish_reason, "stop");
+  assert.equal(compact._omniroute_stream.stage, "provider_response");
+  assert.equal(compact._omniroute_stream.eventCount, 3);
+  assert.equal("events" in compact, false);
+});
+
+test("builds compact Claude stream summary for detailed logs", () => {
+  const collector = createStructuredSSECollector({ stage: "provider_response" });
+
+  collector.push({
+    type: "message_start",
+    message: {
+      id: "msg_1",
+      model: "claude-sonnet-4",
+      role: "assistant",
+      usage: { input_tokens: 11 },
+    },
+  });
+  collector.push({
+    type: "content_block_start",
+    index: 0,
+    content_block: { type: "text", text: "" },
+  });
+  collector.push({
+    type: "content_block_delta",
+    index: 0,
+    delta: { type: "text_delta", text: "你好" },
+  });
+  collector.push({
+    type: "message_delta",
+    delta: { stop_reason: "end_turn" },
+    usage: { output_tokens: 7 },
+  });
+
+  const summary = buildStreamSummaryFromEvents(
+    collector.getEvents(),
+    FORMATS.CLAUDE,
+    "claude-sonnet-4"
+  );
+  const compact = compactStructuredStreamPayload(
+    collector.build(summary, { includeEvents: false })
+  );
+
+  assert.equal(compact.type, "message");
+  assert.equal(compact.model, "claude-sonnet-4");
+  assert.deepEqual(compact.content, [{ type: "text", text: "你好" }]);
+  assert.equal(compact.usage.input_tokens, 11);
+  assert.equal(compact.usage.output_tokens, 7);
+  assert.equal(compact._omniroute_stream.eventCount, 4);
+});