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thinking options type cannot be disabled Claude Code

Quick fix

Upgrade cc-switch to v3.16.4 or later; the agent automatically strips the reasoning_effort parameter conflicting with DeepSeek.

Symptom

Section titled “Symptom”
Error output
API Error: 400 thinking options type cannot be disabled when reasoning_effort is set

Cause

Section titled “Cause”

When running Dynamic Workflows or sub-agents in Claude Code, the system forces `thinking: { type: "disabled" }`. When cc-switch forwards requests to the DeepSeek endpoint, if it also carries the `reasoning_effort` or `output_config.effort` parameter, the DeepSeek API rejects the request with a 400 error due to mutual exclusivity between these parameters. Since users typically map all models to DeepSeek, simply switching models does not bypass this issue.

Fix

Section titled “Fix”

  1. Upgrade cc-switch to v3.16.4 or later.

  2. Ensure DeepSeek requests are routed through cc-switch's local routing; the new version automatically cleans conflicting parameters at the forwarding layer.

Affected Versions

Section titled “Affected Versions”
ToolClaude Code
Versioncc-switch < 3.16.4 (已在 v3.16.4 修复)
PlatformsmacOS

Source Issues

Section titled “Source Issues”

This page is distilled from 2 real issues

FAQ

Section titled “FAQ”
Can switching models or lowering the effort level resolve this error?
No. Because cc-switch maps all models to the same DeepSeek backend, and Claude Code workflows force thinking to be disabled, any request carrying the reasoning_effort parameter triggers a conflict. You must upgrade cc-switch to enable automatic parameter cleaning.
Do other models besides DeepSeek encounter this problem?
Using the Anthropic official API with the Opus model has similar issues, but switching to Sonnet bypasses them. However, when using cc-switch to map everything to DeepSeek, all requests trigger this conflict.
Section titled “Related problems”
api failed deserialize json body intoDepending on the error: roll Claude Code back, upgrade cc-switch, turn the local proxy off, or stop sending unsupported fields.7 issues mergedAPI Error: 400 Param Incorrect Claude CodeUpgrade CC Switch to v3.16.2+ to fix 400 errors caused by missing reasoning_content in MiMo thinking mode.2 issues mergedRequest body format invalid error - Claude CodeUpgrade cc-switch and enable the Rectifier, or add MAX_THINKING_TOKENS=0, for compatibility with third-party API formats.4 issues merged

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