DeepSeek V4 Pro SiliconFlow Bad Request: The reasoning_content in the thinking mode must be passed back to the API. #28974

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1. github-actions

   assigned

   rekram1-node

   on May 23, 2026
2. github-actions commented on May 23, 2026

   

   github-actionsbot

   on May 23, 2026 – with GitHub Actions

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

   • [BUG] DeepSeek reasoning_content not preserved across tool calls, causing HTTP 400 error #28945: DeepSeek reasoning_content not preserved across tool calls, causing HTTP 400 error
   • [Bug]: Opencode Zen v1.15.7 - DeepSeek HTTP 400 caused by missing reasoning_content #28890: DeepSeek HTTP 400 caused by missing reasoning_content
   • Bug: DeepSeek reasoning_content missing on session continuation (v1.15.7) #28716: DeepSeek reasoning_content missing on session continuation
   • thinking is enabled but reasoning_content is missing in assistant tool call message at index ... #25758: thinking is enabled but reasoning_content is missing in assistant tool call message
   • DeepSeek thinking mode: reasoning_content not passed back for tool call turns, causing 400 errors #24722: DeepSeek thinking mode: reasoning_content not passed back for tool call turns, causing 400 errors

   This error has been reported many times. Please search existing issues before filing a new one, and consider adding a "+1" reaction or a comment to an existing issue instead.
3. ListenLove commented on May 23, 2026

   

   ListenLove

   on May 23, 2026 · Hidden as outdated

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4. anggaaryas commented on May 28, 2026

   

   anggaaryas

   on May 28, 2026

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   i found something interesting. The problem is the Provider! After i remove provider (deepseek). Now i can use this model again, but not discounted. sad
5. rekram1-node commented on May 29, 2026

   

   rekram1-node

   on May 29, 2026

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   if people are hitting this plz send sessions:

   opencode export > session.json

   do not run /export
6. MocLG commented on May 29, 2026

   

   MocLG

   on May 29, 2026

   Last edited by MocLG

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   @rekram1-node I am getting same issue, here is output of your command(one note I am using deepseek v4 pro via openrouter with native deepseek endpoint):
   session.json
7. github-actions commented on Jul 29, 2026

   

   github-actionsbot

   on Jul 29, 2026 – with GitHub Actions

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   To stay organized issues are automatically closed after 60 days of no activity. If the issue is still relevant please open a new one.
8. github-actions

   closed this as not plannedon Jul 29, 2026