diff --git a/src/server/routes/proxy/chat.stream.test.ts b/src/server/routes/proxy/chat.stream.test.ts
index f566a57..ed1e39b 100644
--- a/src/server/routes/proxy/chat.stream.test.ts
+++ b/src/server/routes/proxy/chat.stream.test.ts
@@ -3193,6 +3193,8 @@ describe('chat proxy stream behavior', () => {
     expect(response.statusCode).toBe(200);
     expect(response.body).toContain('"finish_reason":"error"');
     expect(response.body).toContain('[DONE]');
+    expect(recordSuccessMock).not.toHaveBeenCalled();
+    expect(recordFailureMock).toHaveBeenCalledTimes(1);
   });
 
   it('preserves non-stream function_call output when /v1/chat/completions falls back to /v1/responses', async () => {
diff --git a/src/server/routes/proxy/chat.ts b/src/server/routes/proxy/chat.ts
index b7886ad..60ed69c 100644
--- a/src/server/routes/proxy/chat.ts
+++ b/src/server/routes/proxy/chat.ts
@@ -366,6 +366,7 @@ async function handleChatProxyRequest(
         const streamSession = openAiChatTransformer.proxyStream.createSession({
           downstreamFormat,
           modelName,
+          successfulUpstreamPath,
           onParsedPayload: (payload) => {
             if (payload && typeof payload === 'object') {
               parsedUsage = mergeProxyUsage(parsedUsage, parseProxyUsage(payload));
@@ -389,9 +390,32 @@ async function handleChatProxyRequest(
           if (String(selected.site.platform || '').trim().toLowerCase() === 'gemini-cli') {
             fallbackData = unwrapGeminiCliPayload(fallbackData);
           }
-          streamSession.consumeUpstreamFinalPayload(fallbackData, fallbackText, reply.raw);
+          const streamResult = streamSession.consumeUpstreamFinalPayload(fallbackData, fallbackText, reply.raw);
 
           const latency = Date.now() - startTime;
+          if (streamResult.status === 'failed') {
+            tokenRouter.recordFailure(selected.channel.id);
+            logProxy(
+              selected,
+              requestedModel,
+              'failed',
+              200,
+              latency,
+              streamResult.errorMessage,
+              retryCount,
+              downstreamPath,
+              parsedUsage.promptTokens,
+              parsedUsage.completionTokens,
+              parsedUsage.totalTokens,
+              0,
+              null,
+              successfulUpstreamPath,
+              clientContext,
+              logDownstreamApiKeyId ? downstreamApiKeyId : null,
+            );
+            return;
+          }
+
           const resolvedUsage = await resolveProxyUsageWithSelfLogFallback({
             site: selected.site,
             account: selected.account,
@@ -443,9 +467,32 @@ async function handleChatProxyRequest(
         const reader = String(selected.site.platform || '').trim().toLowerCase() === 'gemini-cli' && upstreamReader
           ? createGeminiCliStreamReader(upstreamReader)
           : upstreamReader;
-        await streamSession.run(reader, reply.raw);
+        const streamResult = await streamSession.run(reader, reply.raw);
 
         const latency = Date.now() - startTime;
+        if (streamResult.status === 'failed') {
+          tokenRouter.recordFailure(selected.channel.id);
+          logProxy(
+            selected,
+            requestedModel,
+            'failed',
+            200,
+            latency,
+            streamResult.errorMessage,
+            retryCount,
+            downstreamPath,
+            parsedUsage.promptTokens,
+            parsedUsage.completionTokens,
+            parsedUsage.totalTokens,
+            0,
+            null,
+            successfulUpstreamPath,
+            clientContext,
+            logDownstreamApiKeyId ? downstreamApiKeyId : null,
+          );
+          return;
+        }
+
         const resolvedUsage = await resolveProxyUsageWithSelfLogFallback({
           site: selected.site,
           account: selected.account,
diff --git a/src/server/routes/proxy/endpointFlow.test.ts b/src/server/routes/proxy/endpointFlow.test.ts
index fc621b0..8ae89a3 100644
--- a/src/server/routes/proxy/endpointFlow.test.ts
+++ b/src/server/routes/proxy/endpointFlow.test.ts
@@ -185,6 +185,22 @@ describe('executeEndpointFlow', () => {
     expect(fetchMock).toHaveBeenCalledTimes(1);
   });
 
+  it('uses proxyUrl for the default fetch path when no dispatch hook is provided', async () => {
+    fetchMock.mockResolvedValueOnce(toUndiciResponse(new Response(JSON.stringify({ ok: true }), {
+      status: 200,
+      headers: { 'content-type': 'application/json' },
+    })));
+
+    await executeEndpointFlow({
+      siteUrl: 'https://example.com',
+      proxyUrl: 'https://proxy.internal/base',
+      endpointCandidates: ['responses'],
+      buildRequest: () => requestFor('/v1/responses'),
+    });
+
+    expect(fetchMock.mock.calls[0]?.[0]).toBe('https://proxy.internal/base/v1/responses');
+  });
+
   it('returns normalized final error when all endpoints fail', async () => {
     fetchMock.mockResolvedValueOnce(toUndiciResponse(new Response(JSON.stringify({
       error: { message: 'upstream_error', type: 'upstream_error' },
diff --git a/src/server/routes/proxy/endpointFlow.ts b/src/server/routes/proxy/endpointFlow.ts
index 1ed1bc4..03e5e42 100644
--- a/src/server/routes/proxy/endpointFlow.ts
+++ b/src/server/routes/proxy/endpointFlow.ts
@@ -63,6 +63,12 @@ type ExecuteEndpointFlowInput = {
   onDowngrade?: (ctx: EndpointAttemptContext & { errText: string }) => void | Promise<void>;
 };
 
+function buildAbsoluteUrl(base: string, path: string): string {
+  const normalizedBase = base.replace(/\/+$/, '');
+  const normalizedPath = path.replace(/^\/+/, '');
+  return normalizedPath ? `${normalizedBase}/${normalizedPath}` : normalizedBase;
+}
+
 export async function executeEndpointFlow(input: ExecuteEndpointFlowInput): Promise<EndpointFlowResult> {
   const endpointCount = input.endpointCandidates.length;
   if (endpointCount <= 0) {
@@ -80,7 +86,10 @@ export async function executeEndpointFlow(input: ExecuteEndpointFlowInput): Prom
   for (let endpointIndex = 0; endpointIndex < endpointCount; endpointIndex += 1) {
     const endpoint = input.endpointCandidates[endpointIndex] as UpstreamEndpoint;
     const request = input.buildRequest(endpoint, endpointIndex);
-    const targetUrl = buildUpstreamUrl(input.siteUrl, request.path);
+    const defaultTarget = buildUpstreamUrl(input.siteUrl, request.path);
+    const targetUrl = input.proxyUrl
+      ? buildAbsoluteUrl(input.proxyUrl, request.path)
+      : defaultTarget;
 
     let response = input.dispatchRequest
       ? await input.dispatchRequest(request, targetUrl)
diff --git a/src/server/routes/proxy/responses.codex-oauth.test.ts b/src/server/routes/proxy/responses.codex-oauth.test.ts
index 483ce51..cc7d66a 100644
--- a/src/server/routes/proxy/responses.codex-oauth.test.ts
+++ b/src/server/routes/proxy/responses.codex-oauth.test.ts
@@ -16,10 +16,14 @@ const resolveProxyUsageWithSelfLogFallbackMock = vi.fn(async ({ usage }: any) =>
 }));
 const refreshOauthAccessTokenSingleflightMock = vi.fn();
 const recordOauthQuotaResetHintMock = vi.fn();
+const insertedProxyLogs: Record<string, unknown>[] = [];
 const dbInsertMock = vi.fn((_arg?: any) => ({
-  values: () => ({
-    run: () => undefined,
-  }),
+  values: (values: Record<string, unknown>) => {
+    insertedProxyLogs.push(values);
+    return {
+      run: () => undefined,
+    };
+  },
 }));
 
 vi.mock('undici', () => ({
@@ -117,6 +121,7 @@ describe('responses proxy codex oauth refresh', () => {
     refreshOauthAccessTokenSingleflightMock.mockReset();
     recordOauthQuotaResetHintMock.mockReset();
     dbInsertMock.mockClear();
+    insertedProxyLogs.length = 0;
 
     selectChannelMock.mockReturnValue({
       channel: { id: 11, routeId: 22 },
@@ -431,4 +436,35 @@ describe('responses proxy codex oauth refresh', () => {
     expect(secondBody.store).toBe(false);
     expect(secondBody.stream).toBe(true);
   });
+
+  it('does not record success when a streaming responses request ends with response.failed', async () => {
+    fetchMock.mockResolvedValue(createSseResponse([
+      'event: response.created\n',
+      'data: {"type":"response.created","response":{"id":"resp_codex_failed","model":"gpt-5.4","created_at":1706000000,"status":"in_progress","output":[]}}\n\n',
+      'event: response.failed\n',
+      'data: {"type":"response.failed","response":{"id":"resp_codex_failed","model":"gpt-5.4","status":"failed","error":{"message":"tool execution failed"}}}\n\n',
+      'data: [DONE]\n\n',
+    ]));
+
+    const response = await app.inject({
+      method: 'POST',
+      url: '/v1/responses',
+      payload: {
+        model: 'gpt-5.4',
+        input: 'hello codex',
+        stream: true,
+      },
+    });
+
+    expect(response.statusCode).toBe(200);
+    expect(response.body).toContain('response.failed');
+    expect(response.body).not.toContain('response.completed');
+    expect(recordSuccessMock).not.toHaveBeenCalled();
+    expect(recordFailureMock).toHaveBeenCalledTimes(1);
+    expect(insertedProxyLogs.at(-1)).toMatchObject({
+      status: 'failed',
+      httpStatus: 200,
+    });
+    expect(String(insertedProxyLogs.at(-1)?.errorMessage || '')).toContain('tool execution failed');
+  });
 });
diff --git a/src/server/routes/proxy/responses.ts b/src/server/routes/proxy/responses.ts
index fe73c68..6edc5ff 100644
--- a/src/server/routes/proxy/responses.ts
+++ b/src/server/routes/proxy/responses.ts
@@ -457,9 +457,32 @@ export async function responsesProxyRoute(app: FastifyInstance) {
               reply.raw.write(chunk);
             },
           });
-          await streamSession.run(reader, reply.raw);
+          const streamResult = await streamSession.run(reader, reply.raw);
 
           const latency = Date.now() - startTime;
+          if (streamResult.status === 'failed') {
+            tokenRouter.recordFailure(selected.channel.id);
+            logProxy(
+              selected,
+              requestedModel,
+              'failed',
+              200,
+              latency,
+              streamResult.errorMessage,
+              retryCount,
+              downstreamPath,
+              parsedUsage.promptTokens,
+              parsedUsage.completionTokens,
+              parsedUsage.totalTokens,
+              0,
+              null,
+              successfulUpstreamPath,
+              clientContext,
+              logDownstreamApiKeyId ? downstreamApiKeyId : null,
+            );
+            return;
+          }
+
           const resolvedUsage = await resolveProxyUsageWithSelfLogFallback({
             site: selected.site,
             account: selected.account,
diff --git a/src/server/transformers/openai/chat/proxyStream.ts b/src/server/transformers/openai/chat/proxyStream.ts
index 15af7ad..54161ae 100644
--- a/src/server/transformers/openai/chat/proxyStream.ts
+++ b/src/server/transformers/openai/chat/proxyStream.ts
@@ -14,6 +14,7 @@ type StreamReader = {
 type ChatProxyStreamSessionInput = {
   downstreamFormat: DownstreamFormat;
   modelName: string;
+  successfulUpstreamPath: string;
   onParsedPayload?: (payload: unknown) => void;
   writeLines: (lines: string[]) => void;
   writeRaw: (chunk: string) => void;
@@ -23,6 +24,11 @@ type ResponseSink = {
   end(): void;
 };
 
+type ChatProxyStreamResult = {
+  status: 'completed' | 'failed';
+  errorMessage: string | null;
+};
+
 export function createChatProxyStreamSession(input: ChatProxyStreamSessionInput) {
   const downstreamTransformer = input.downstreamFormat === 'claude'
     ? anthropicMessagesTransformer
@@ -39,6 +45,36 @@ export function createChatProxyStreamSession(input: ChatProxyStreamSessionInput)
     ? createOpenAiChatAggregateState()
     : null;
   let finalized = false;
+  let terminalResult: ChatProxyStreamResult = {
+    status: 'completed',
+    errorMessage: null,
+  };
+
+  const extractFailureMessage = (payload: unknown, fallback = 'upstream stream failed'): string => {
+    if (payload && typeof payload === 'object' && !Array.isArray(payload)) {
+      const record = payload as Record<string, unknown>;
+      if (record.error && typeof record.error === 'object' && !Array.isArray(record.error)) {
+        const message = (record.error as Record<string, unknown>).message;
+        if (typeof message === 'string' && message.trim()) return message.trim();
+      }
+      if (typeof record.message === 'string' && record.message.trim()) return record.message.trim();
+      if (record.response && typeof record.response === 'object' && !Array.isArray(record.response)) {
+        const responseError = (record.response as Record<string, unknown>).error;
+        if (responseError && typeof responseError === 'object' && !Array.isArray(responseError)) {
+          const message = (responseError as Record<string, unknown>).message;
+          if (typeof message === 'string' && message.trim()) return message.trim();
+        }
+      }
+    }
+    return fallback;
+  };
+
+  const markFailed = (payload: unknown, fallbackMessage?: string) => {
+    terminalResult = {
+      status: 'failed',
+      errorMessage: extractFailureMessage(payload, fallbackMessage),
+    };
+  };
 
   const finalize = () => {
     if (finalized) return;
@@ -51,7 +87,12 @@ export function createChatProxyStreamSession(input: ChatProxyStreamSessionInput)
       return;
     }
 
-    if (input.downstreamFormat === 'openai' && chatAggregateState && chatAggregateState.choices.size > 0) {
+    if (
+      input.downstreamFormat === 'openai'
+      && terminalResult.status !== 'failed'
+      && chatAggregateState
+      && chatAggregateState.choices.size > 0
+    ) {
       const needsTerminalFinishChunk = Array.from(chatAggregateState.choices.values())
         .some((choice) => !choice.finishReason);
       if (needsTerminalFinishChunk) {
@@ -109,6 +150,12 @@ export function createChatProxyStreamSession(input: ChatProxyStreamSessionInput)
     }
 
     if (parsedPayload && typeof parsedPayload === 'object') {
+      const payloadType = typeof (parsedPayload as Record<string, unknown>).type === 'string'
+        ? String((parsedPayload as Record<string, unknown>).type)
+        : '';
+      if (payloadType === 'response.failed' || payloadType === 'error') {
+        markFailed(parsedPayload);
+      }
       const normalizedEvent = downstreamTransformer.transformStreamEvent(parsedPayload, streamContext, input.modelName);
       if (input.downstreamFormat === 'openai' && chatAggregateState) {
         applyOpenAiChatStreamEvent(chatAggregateState, normalizedEvent);
@@ -129,10 +176,18 @@ export function createChatProxyStreamSession(input: ChatProxyStreamSessionInput)
   };
 
   return {
-    consumeUpstreamFinalPayload(payload: unknown, fallbackText: string, response?: ResponseSink) {
+    consumeUpstreamFinalPayload(payload: unknown, fallbackText: string, response?: ResponseSink): ChatProxyStreamResult {
       if (payload && typeof payload === 'object') {
         input.onParsedPayload?.(payload);
       }
+      if (payload && typeof payload === 'object' && !Array.isArray(payload)) {
+        const payloadType = typeof (payload as Record<string, unknown>).type === 'string'
+          ? String((payload as Record<string, unknown>).type)
+          : '';
+        if (payloadType === 'response.failed' || payloadType === 'error') {
+          markFailed(payload);
+        }
+      }
       if (input.downstreamFormat === 'openai') {
         const normalizedFinal = openAiChatOutbound.normalizeFinal(payload, input.modelName, fallbackText);
         streamContext.id = normalizedFinal.id;
@@ -156,8 +211,9 @@ export function createChatProxyStreamSession(input: ChatProxyStreamSessionInput)
       }
       finalize();
       response?.end();
+      return terminalResult;
     },
-    async run(reader: StreamReader | null | undefined, response: ResponseSink) {
+    async run(reader: StreamReader | null | undefined, response: ResponseSink): Promise<ChatProxyStreamResult> {
       const lifecycle = createProxyStreamLifecycle<ParsedSseEvent>({
         reader,
         response,
@@ -166,6 +222,7 @@ export function createChatProxyStreamSession(input: ChatProxyStreamSessionInput)
         onEof: finalize,
       });
       await lifecycle.run();
+      return terminalResult;
     },
   };
 }
diff --git a/src/server/transformers/openai/responses/proxyStream.ts b/src/server/transformers/openai/responses/proxyStream.ts
index 14ebc71..7fbc9e3 100644
--- a/src/server/transformers/openai/responses/proxyStream.ts
+++ b/src/server/transformers/openai/responses/proxyStream.ts
@@ -13,6 +13,11 @@ type ResponseSink = {
   end(): void;
 };
 
+type ResponsesProxyStreamResult = {
+  status: 'completed' | 'failed';
+  errorMessage: string | null;
+};
+
 type ResponsesProxyStreamSessionInput = {
   modelName: string;
   successfulUpstreamPath: string;
@@ -33,20 +38,58 @@ function isRecord(value: unknown): value is Record<string, unknown> {
   return !!value && typeof value === 'object';
 }
 
+function getResponsesStreamFailureMessage(payload: unknown, fallback = 'upstream stream failed'): string {
+  if (isRecord(payload)) {
+    if (isRecord(payload.error) && typeof payload.error.message === 'string' && payload.error.message.trim()) {
+      return payload.error.message.trim();
+    }
+    if (typeof payload.message === 'string' && payload.message.trim()) {
+      return payload.message.trim();
+    }
+    if (isRecord(payload.response) && isRecord(payload.response.error) && typeof payload.response.error.message === 'string' && payload.response.error.message.trim()) {
+      return payload.response.error.message.trim();
+    }
+  }
+  return fallback;
+}
+
 export function createResponsesProxyStreamSession(input: ResponsesProxyStreamSessionInput) {
   const streamContext = openAiResponsesStream.createContext(input.modelName);
   const responsesState = createOpenAiResponsesAggregateState(input.modelName);
   let finalized = false;
+  let terminalResult: ResponsesProxyStreamResult = {
+    status: 'completed',
+    errorMessage: null,
+  };
 
   const finalize = () => {
     if (finalized) return;
     finalized = true;
+    terminalResult = {
+      status: 'completed',
+      errorMessage: null,
+    };
     input.writeLines(completeResponsesStream(responsesState, streamContext, input.getUsage()));
   };
 
+  const fail = (payload: unknown, fallbackMessage?: string) => {
+    if (finalized) return;
+    finalized = true;
+    terminalResult = {
+      status: 'failed',
+      errorMessage: getResponsesStreamFailureMessage(payload, fallbackMessage),
+    };
+    input.writeLines(failResponsesStream(responsesState, streamContext, input.getUsage(), payload));
+  };
+
+  const closeOut = () => {
+    if (finalized) return;
+    finalize();
+  };
+
   const handleEventBlock = (eventBlock: ParsedSseEvent): boolean => {
     if (eventBlock.data === '[DONE]') {
-      finalize();
+      closeOut();
       return true;
     }
 
@@ -71,8 +114,7 @@ export function createResponsesProxyStreamSession(input: ResponsesProxyStreamSes
       || payloadType === 'response.failed'
     );
     if (isFailureEvent) {
-      input.writeLines(failResponsesStream(responsesState, streamContext, input.getUsage(), parsedPayload));
-      finalized = true;
+      fail(parsedPayload);
       return true;
     }
 
@@ -97,15 +139,16 @@ export function createResponsesProxyStreamSession(input: ResponsesProxyStreamSes
   };
 
   return {
-    async run(reader: StreamReader | null | undefined, response: ResponseSink) {
+    async run(reader: StreamReader | null | undefined, response: ResponseSink): Promise<ResponsesProxyStreamResult> {
       const lifecycle = createProxyStreamLifecycle<ParsedSseEvent>({
         reader,
         response,
         pullEvents: (buffer) => openAiResponsesStream.pullSseEvents(buffer),
         handleEvent: handleEventBlock,
-        onEof: finalize,
+        onEof: closeOut,
       });
       await lifecycle.run();
+      return terminalResult;
     },
   };
 }