400 Error using ZenMux with Kimi K2.5: "reasoning_content is missing" #15197

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1. Vwings

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   bugSomething isn't workingSomething isn't working

   on Feb 26, 2026
2. github-actions commented on Feb 26, 2026

   

   github-actionsBot

   on Feb 26, 2026 – with GitHub Actions

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

   • Kimi K2.5 can't enable thinking (reasoning_content missing #12090: Kimi K2.5 can't enable thinking (reasoning_content missing) — same error and model, now closed
   • Why does opencode send reasoning_content in OpenAI-compatible messages, and why does it affect model output? #13130: Why does opencode send reasoning_content in OpenAI-compatible messages — related root cause discussion
   • Kimi 2.5 Reasoning Cutoff/Missing when using NVIDIA API #13515: Kimi 2.5 Reasoning Cutoff/Missing when using NVIDIA API — similar reasoning_content handling issue with Kimi K2.5

   If your issue is distinct from the above, please add a note explaining the difference.
3. github-actions

   assigned

   rekram1-node

   on Feb 26, 2026
4. 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 Feb 26, 2026
5. OpeOginni commented on Feb 26, 2026

   

   OpeOginni

   on Feb 26, 2026

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   @Vwings based on this previous solution #12090 (comment), could you try adding this to the model config in your opencode.json?

    "provider": {
       "zenmux": {
         "models": {
           "moonshotai/kimi-k2.5": {
             "options": {
                "thinking": {
                   "type": "enabled",
                   "budgetTokens": 16000 // this is required for ai sdk even tho it doesnt do anything in actuality
                 }
             }
           }
         }
       }
     }
6. Vwings commented on Feb 27, 2026

   

   Vwings

   on Feb 27, 2026

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   @Vwings based on this previous solution #12090 (comment), could you try adding this to the model config in your opencode.json?

   "provider": {
   "zenmux": {
   "models": {
   "moonshotai/kimi-k2.5": {
   "options": {
   "thinking": {
   "type": "enabled",
   "budgetTokens": 16000 // this is required for ai sdk even tho it doesnt do anything in actuality
   }
   }
   }
   }
   }
   }

   Tried that, but the issue persists with the exact same error message.

   👍React with 👍1Reacted by Luca Donnaloia
7. github-actions commented on Apr 29, 2026

   

   github-actionsBot

   on Apr 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 Apr 29, 2026