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invalid thinking: only type=enabled is allowed for this model Codex

Quick fix

Kimi's deepseek-v4-flash rejects the current thinking parameter; the original post provides no verified solution.

Symptom

Section titled “Symptom”
Error output
CC Switch local proxy failed while handling Codex endpoint /responses. Provider: Kimi; model: deepseek-v4-flash; upstream_status: HTTP 400; cause: invalid thinking: only type=enabled is allowed for this model

Cause

Section titled “Cause”

In this report, Codex called Kimi's deepseek-v4-flash through the CC Switch local proxy, and the upstream returned HTTP 400. The error states that this model accepts only a thinking parameter with type=enabled, indicating that the request's thinking parameter type was not accepted by the model.

This issue is labeled question, and its only follow-up asks, “How was this resolved?” The post does not record a maintainer-confirmed fix, a user-verified workaround, a configuration path, or affected versions; being closed does not itself mean it was fixed.

Fix

Section titled “Fix”

  1. The original post provides no verified solution; continue following the source issue for this model's compatibility requirements for the thinking parameter.

Affected Versions

Section titled “Affected Versions”
ToolCodex
VersionUnknown
PlatformsUnknown

Source Issues

Section titled “Source Issues”

This page is distilled from 1 real issues

FAQ

Section titled “FAQ”
How was this resolved?
The original post provides no verified solution. The known behavior is that Kimi's deepseek-v4-flash accepts only a thinking parameter with type=enabled.
Section titled “Related problems”
CC Switch is currently a black box; users cannot customize processing logicThis is a feature request for programmable routing transformation scripts in CC Switch; the original post has no verifiable official solution.1 issues mergedThe `content[].thinking` in thinking modeSome variants remain unresolved: upgrade to a version with the thinking history normalization fix; for Codex routed through DeepSeek, use a version with the…13 issues mergedSessions may stop responding (JSONL stops being written) — Claude CodeUpdate CC Switch to the latest 4.0 release and retry. If it still hangs, temporarily bypass CC Switch and submit complete reproduction details.1 issues merged

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