fix(chat): surface thinking traces on Chat Completions - #1692
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Chat Completions clients such as Grok Build send reasoning_effort but not reasoning.summary. The internal Responses parser hides thinking unless summary is set and is not none, so delta.reasoning_content never reached the client. Default summary to auto when the client asked for effort, honor explicit summary / include_reasoning, and leave requests with no reasoning knobs unchanged.
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📝 WalkthroughWalkthroughChat Completions reasoning controls now map to Responses reasoning summaries. Effort-only requests default to ChangesReasoning control translation
Estimated code review effort: 3 (Moderate) | ~20 minutes Merge Risk: ⚪ Minimal · up to The change maps reasoning settings so thinking traces reach Chat Completions clients while preserving existing behavior when no reasoning options are supplied; no actionable merge-blocking risk remains after normal checks. Sequence Diagram(s)sequenceDiagram
participant ChatCompletionsClient
participant ChatInbound
participant ChatCompletionsServer
participant ResponsesRequestParser
ChatCompletionsClient->>ChatInbound: Send reasoning controls
ChatInbound->>ChatInbound: Resolve summary and default to auto
ChatInbound->>ChatCompletionsServer: Emit reasoning configuration
ChatCompletionsServer->>ChatCompletionsServer: Normalize effort against supported ladder
ChatCompletionsServer->>ResponsesRequestParser: Parse normalized reasoning settings
ResponsesRequestParser-->>ChatCompletionsClient: Stream reasoning content or suppress it
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Inline comments:
In `@src/chat/inbound.ts`:
- Around line 216-220: Update resolveReasoningSummary so a validated
reasoning.summary is resolved before applying include_reasoning as a fallback,
ensuring explicit summaries win for both conflicting combinations. Add
regression coverage for include_reasoning true with summary none and
include_reasoning false with summary auto, without changing provider or adapter
contracts.
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📒 Files selected for processing (4)
docs-site/src/content/docs/guides/grok-build.mddocs-site/src/content/docs/reference/proxy-formats.mdsrc/chat/inbound.tstests/chat-completions-endpoint.test.ts
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Reviewed commit: 3f674dc830
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CodeRabbit: resolve a validated reasoning.summary before include_reasoning so conflicting knobs cannot leak or hide traces. Codex: an empty effort ladder means no effort control, not no thinking. Strip only reasoning.effort so include_reasoning / summary-only requests still reach parseRequest.
2 participants
Summary
Grok Build and other Chat Completions clients send
reasoning_effortbut notreasoning.summary. The inbound translator turned that into{ reasoning: { effort } }only. The internal Responses parser treats a missing summary asnoneand setshideThinkingSummary, so thinking deltas never becomedelta.reasoning_content.This is the path Grok Build uses (
api_backend = "chat_completions"). DeepSeek V4 Flash (and other thinking models) still spend reasoning tokens; the traces were swallowed before they reached the client.The translator now defaults
reasoning.summaryto "auto"when the client asked for effort, honors an explicitreasoning.summaryorinclude_reasoning`, and still omits the reasoning object when the client sent no reasoning knobs.Reproduced against a local proxy with DeepSeek V4 Flash:
reasoning_effort: max→ 0 reasoning chars before the changereasoning: { effort: max, summary: auto }→ thinking streameddelta.reasoning_contentVerification
bun run typecheck— passbun test tests/chat-completions-endpoint.test.ts tests/anthropic-reasoning.test.ts tests/routing-policy-surface-parity.test.ts— 112 pass, 0 fail (includes the new summary-mapping cases and the existing Chat Completions → Anthropic JSON Schema round trip)POST /v1/chat/completionswithreasoning_effort: maxafter the same inbound change: 88reasoning_contentchunks / 358 chars (was 0)bun run teston this Windows machine also hit unrelated failures incodex-models-cache-invalidate.test.tsandcodex-native-residue.test.ts(Windows identity lookup + a Bun crash). Those files are outside this diff.Checklist
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New Features
Documentation