reasoning_content not sent when using @ai-sdk/openai-compatible with deepseek-reasoner #6040

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1. aaudin90

   added

   bugSomething isn't workingSomething isn't working

   on Dec 23, 2025
2. github-actions commented on Dec 23, 2025

   

   github-actionsBot

   on Dec 23, 2025 – with GitHub Actions

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

   • DeepSeek 3.2: Missing reasoning_content #4947: DeepSeek 3.2: Missing reasoning_content - Similar issue with missing reasoning_content field
   • Deepseek missing "reasoning_content" field ; deepseek_reasoner model erroring out #5027: Deepseek missing "reasoning_content" field; deepseek_reasoner model erroring out - Same error with deepseek_reasoner model
   • DeepSeek API requires reasoning_content but opencode does not preserve or forward it #5332: DeepSeek API requires reasoning_content but opencode does not preserve or forward it - Issue about not forwarding reasoning_content
   • DeepSeek V3.2 : reasoning_content not cleared from message history on new turns, causing excess token usage and violating API spec #5577: DeepSeek V3.2: reasoning_content not cleared from message history on new turns - Related issue about reasoning_content handling

   Feel free to ignore if this addresses a specific case with @ai-sdk/openai-compatible that differs from these issues.
3. github-actions

   assigned

   rekram1-node

   on Dec 23, 2025
4. rekram1-node commented on Dec 23, 2025

   

   rekram1-node

   on Dec 23, 2025

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   If you are making a custom model that needs reasoning content you need to tell us this in your config so just add:

   “interleaved”: {
   “field”: “reasoning_content”
   }

   to your model options and it should work
5. rekram1-node

   removed

   bugSomething isn't workingSomething isn't working

   on Dec 23, 2025
6. rekram1-node commented on Dec 23, 2025

   

   rekram1-node

   on Dec 23, 2025

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   Here is what you need to set:

   {
     "$schema": "https://opencode.ai/config.json",
     "provider": {
       "my-proxy": {
         "npm": "@ai-sdk/openai-compatible",
         "options": {
           "baseURL": "http://localhost:8001/v1",
         },
         "models": {
           "deepseek-reasoner": {
             "id": "deepseek-reasoner",
             "name": "DeepSeek Reasoner",
             "interleaved": {
               "field": "reasoning_content",
             },
           },
         },
       },
     },
   }
   

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7. rekram1-node

   closed this as completedon Dec 23, 2025
8. aaudin90 commented on Dec 24, 2025

   

   aaudin90

   on Dec 24, 2025

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   It works, thx