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[Bug] v1.14.28 DeepSeek V4 thinking mode: content[].thinking must be passed back to API in multi-turn conversations #24803
Description
Description
Bug Description
When using DeepSeek V4 Flash with thinking mode enabled, multi-turn conversations fail with:
Bad Request: {"error":{"message":"The content[].thinking in the thinking mode must be passed back to the API.","type":"invalid_request_error","param":null,"code":"invalid_request_error"}}
Environment
- OpenCode Version: 1.14.28
- Model: deepseek-v4-flash
- Provider: deepseek (configured with
@ai-sdk/openai-compatible) - API Endpoint: https://api.deepseek.com/anthropic/messages
Steps to Reproduce
- Configure deepseek-v4-flash model with thinking mode enabled
- Start a conversation with the model
- First turn works fine - model responds
- Second turn (continuing the conversation) fails with the above 400 error
Expected Behavior
The thinking content should be preserved and passed back to the API in subsequent requests, allowing multi-turn conversations to work correctly.
Actual Behavior
The first API call succeeds, but the second call fails with a 400 error indicating that content[].thinking is not being passed back.
Additional Context
- This appears to be related to issue DeepSeek thinking mode: reasoning_content must be passed back to API on conversation continuation #24104 and [DeepSeek V4] reasoning_content not round-tripped — 400 error on multi-turn tool calls #24190 which address
reasoning_contentfor OpenAI-compatible endpoint - The attached session.json shows the error occurring on the second turn
Plugins
No response
OpenCode version
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Steps to reproduce
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Screenshot and/or share link
Operating System
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Terminal
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Reacted by froooze
Activity
github-actions commentedon Apr 28, 2026
This issue might be a duplicate of existing issues. Please check:
content[].thinkingin the thinking mode must be passed back to the API.","type":"invalid_request_error","param":null,"code":"invalid_request_error"}} #24791: Same exact error message —content[].thinkingmust be passed back to the API, DeepSeek thinking mode multi-turnPlease review the above issues and comment there if your situation matches, to help consolidate the discussion.
CHesketh76 commentedon Apr 28, 2026
Running into the same issue on Version 1.14.28.
zzk203 commentedon Apr 28, 2026
Thank you, it works fine after adding interleaved. @rekram1-node
zzk203 commentedon Apr 28, 2026
froooze commentedon Apr 30, 2026
rekram1-node commentedon Apr 30, 2026
@froooze please supply more information: