feat: add OpenAI Responses API endpoint support#219
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Add /v1/responses and /responses endpoints that forward requests directly to GitHub Copilot's responses API. This enables support for responses-only models like gpt-5.4 and gpt-5.3-codex.
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@Alex1Yuan Duplicated with #170. You can use https://github.com/caozhiyuan/copilot-api (includes many advanced features). This repository hasn't been maintained for half a year. |
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Get it, thank you. |
wenbo97
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Jun 18, 2026
…ress + endpoint router Make /responses-only Copilot models (gpt-5.3-codex, gpt-5.5) reachable for the Codex /v1/responses client, which previously 400'd with unsupported_api_for_model because the proxy translated every surface down to /chat/completions. - get-models.ts: surface supported_endpoints + capabilities.supports.reasoning_effort (previously dropped from the Model type) - lib/endpoint-router.ts (new): modelSupportsEndpoint() reads the live catalog - services/copilot/create-responses.ts (new): native POST /responses egress through the existing copilotFetch chokepoint (preserves 401-retry; diverges from PR ericc-ch#219 raw fetch) - routes/responses/handler.ts: passthrough (no translation) when the target model is /responses-native; existing Codex->Claude translate-down path unchanged - routes/models/route.ts: expose supported_endpoints in /models output - tests: endpoint-router + create-responses unit tests; fix pre-existing create-chat-completions test (missing copilotTokenExpiresAt fired a token refresh) - docs: mark P0 done + live-verified; .gitignore traces-*/; dev script drops --trace Live-verified on :4142 against the enterprise backend: Codex->gpt-5.3-codex/gpt-5.5/ gpt-5.4 (incl. streaming + tool calls), Codex->claude translate-down, CC->claude unchanged. bun test: 61 pass. Unlocks Codex -> all model groups. CC -> gpt-5.5/codex (Messages->Responses bridge) remains P1.1. Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
wenbo97
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Document WHY the two cross-protocol fidelity-matrix paths are structurally lossy for reasoning/thinking, backed by two adversarially-verified deep-research rounds (45 primary sources, zero counterexamples) plus live byte-level probes against the real enterprise Copilot backend. New: docs/universal-proxy/cross-protocol-reasoning-research.md - Root cause is dual: cryptographic opacity (signature/encrypted_content bound to issuer) AND missing target field (OpenAI Chat Completions has no thinking_blocks). - Per-gateway behavior table (OpenAI/Anthropic/LiteLLM/OpenRouter/claude-code-router/ Portkey/codex-responses-bridge): all carry reasoning same-protocol only, drop it, or fabricate a fake signature (CCR uses Date.now()). - 4 live probes: Copilot rejects store:true (no server-side state), reasoning id is an encrypted blob with empty content/summary, same-protocol replay works, CC→Claude signature is native Anthropic passthrough. - Refuted claims retained for honesty (incl. retracting "omission is officially sanctioned" — only "pass unchanged when included" survives verification). DESIGN.md: drop two upstream PR ericc-ch#219 process references (out of scope for this self-use fork) and link footnote 2 to the new research doc. Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
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Summary
/v1/responsesand/responsesendpoints that forward requests directly to GitHub Copilot's responses APIChanges
src/services/copilot/create-responses.ts— Copilot responses API clientsrc/routes/responses/route.ts— Route registration with error handlingsrc/routes/responses/handler.ts— Request handler (streaming + non-streaming)src/server.ts— Register new endpointsTest plan
tsc --noEmit)unsupported_api_for_modelerror