DeepSeek V4 400: The reasoning_content in the thinking mode must be passed back to the API. #24385

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1. Carrie-L

   added

   bugSomething isn't workingSomething isn't working

   on Apr 25, 2026
2. github-actions

   assigned

   rekram1-node

   on Apr 25, 2026
3. github-actions

   added

   coreAnything pertaining to core functionality of the application (opencode server stuff)Anything pertaining to core functionality of the application (opencode server stuff)

   windows

   on Apr 25, 2026
4. github-actions commented on Apr 25, 2026

   

   github-actionsBot

   on Apr 25, 2026 – with GitHub Actions

   Contributor

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   This issue might be a duplicate of existing issues. Please check:

   • Error from provider (DeepSeek): The reasoning_content in the thinking mode must be passed back to the API. #24334: Same error message — "The reasoning_content in the thinking mode must be passed back to the API." with DeepSeek
   • Bug: DeepSeek reasoning_content not passed back in multi-turn conversations #24261: Bug: DeepSeek reasoning_content not passed back in multi-turn conversations
   • [DeepSeek V4] reasoning_content not round-tripped — 400 error on multi-turn tool calls #24190: [DeepSeek V4] reasoning_content not round-tripped — 400 error on multi-turn tool calls

   Please review those issues and add a thumbs-up reaction or comment there rather than opening a new report. If your situation differs meaningfully, please describe how it differs from the existing reports.
5. rekram1-node commented on Apr 26, 2026

   

   rekram1-node

   on Apr 26, 2026

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   I don't see how this is relevant to opencode, also please use english in issues
6. rekram1-node

   closed this as not plannedon Apr 26, 2026
7. kihere commented on May 2, 2026

   

   kihere

   on May 2, 2026

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   我也是同样的问题