claude-code - 💡(How to fix) Fix [BUG] WebSearch tool fails with "deepseek-reasoner does not support this tool_choice" for all Chinese and English queries [1 participants]

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anthropics/claude-code#58590Fetched 2026-05-14 03:44:21
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Error Message

API Error: 400 deepseek-reasoner does not support this tool_choice

Error Messages/Logs

API Error: 400 deepseek-reasoner does not support this tool_choice

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Preflight Checklist

  • I have searched existing issues and this hasn't been reported yet
  • This is a single bug report (please file separate reports for different bugs)
  • I am using the latest version of Claude Code

What's Wrong?

API Error: 400 deepseek-reasoner does not support this tool_choice

What Should Happen?

WebSearch工具应该正常返回中文和英文的搜索结果,包括网页标题、URL和摘要。

Error Messages/Logs

Steps to Reproduce

  1. 在Claude Code会话中,使用WebSearch工具发起任意中文查询,例如:
    • 股权回购 创始股东 责任上限 以股权为限 典型判决案例
    • 民法典第466条 合同解释 案例 股权投资
  2. 同样发起任意英文查询,例如: - equity redemption founder liability cap China court case
  3. 观察返回结果
  4. 实际结果:所有查询均返回: API Error: 400 deepseek-reasoner does not support this tool_choice

备注:该错误与具体查询内容无关,中文和英文、简单和复杂查询均受影响。经多次重试(超过10次)确认,非偶发问题。

Claude Model

None

Is this a regression?

Yes, this worked in a previous version

Last Working Version

No response

Claude Code Version

Claude Code v2.1.140

Platform

Anthropic API

Operating System

macOS

Terminal/Shell

Terminal.app (macOS)

Additional Information

No response

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