Kimi K2.5 can't enable thinking (reasoning_content missing #12090

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1. 3dot141

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   bugSomething isn't workingSomething isn't working

   on Feb 4, 2026
2. github-actions

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   rekram1-node

   on Feb 4, 2026
3. github-actions

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   zenRelates to ZenRelates to Zen

   on Feb 4, 2026
4. github-actions commented on Feb 4, 2026

   

   github-actionsBot

   on Feb 4, 2026 – with GitHub Actions

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

   • New Kimi 2.5 model is giving error "Extra inputs are not permitted, field: 'reasoning_content', value: []" #11446: New Kimi 2.5 model is giving error "Extra inputs are not permitted, field: 'reasoning_content', value: []" - Reports the exact same reasoning_content error when using Kimi K2.5
   • Kimi K2.5 model ID 'k2p5' bypasses reasoning variants exclusion #11917: Kimi K2.5 model ID 'k2p5' bypasses reasoning variants exclusion - Related issue about Kimi K2.5 reasoning support configuration (CLOSED)

   Feel free to ignore if none of these address your specific case.
5. leosongwei commented on Feb 4, 2026

   

   leosongwei

   on Feb 4, 2026

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   chould be this? vllm-project/vllm#33616
6. docg1701 commented on Feb 4, 2026

   

   docg1701

   on Feb 4, 2026

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   It works fine with opencode-ai@1.1.49 but is broken since 1.1.50. I just checked. Kimi K2.5 got really dumb and non-thinking. Can't make it max/high variants with ctrl+t (which is missing past 1.1.49 in TUI).

   To fix this:
   add "autoupdate": false in ~/.config/opencode/opencode.json
   Then,
   npm install -g opencode-ai@1.1.49

   $ cat ~/.config/opencode/opencode.json 
   {
     "$schema": "https://opencode.ai/config.json",
       "tui": {
         "scroll_speed": 3,
         "scroll_acceleration": {
           "enabled": true
         }
      },
     "autoupdate": false,
     "mcp": {
       "context7": {
         "type": "local",
         "command": [
           "npx",
           "-y",
           "@upstash/context7-mcp",
           "--api-key",
           "ctx7sk-d860989a-2d42-48d6-9da8-4990ba4fd697"
         ],
         "enabled": true
       }
     }
   }
7. rekram1-node commented on Feb 4, 2026

   

   rekram1-node

   on Feb 4, 2026

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   The kimi-for-coding provider has thinking off by default, I merged a fix to make it think by default in next release (consistent w/ other providers)

   The high/max actually makes no difference in thinking u just need to explicitly turn it on for that provider. I merged a "fix" from some external contributor who cited claims from kimi team directly.

   It caused this issue, but @monotykamary fixed it. you can fix temporarily using this:

    "provider": {
       "kimi-for-coding": {
         "models": {
           "k2p5": {
             "options": {
                "thinking": {
                   "type": "enabled",
                   "budgetTokens": 16000 // this is required for ai sdk even tho it doesnt do anything in actuality
                 }
             }
           }
         }
       }
     }
   

   👍React with 👍9Reacted by magicJie, Yes365, Anh Tu Tran, Huakun, Tianyu Du, Jaume Noguera, Andrew A, Omid Sayfun and 0x0000ffff
8. rekram1-node

   marked FIX KIMI K2.5 from "Kimi For Coding" provider NOT having reasoning enabled. #12183 as a duplicate of this issue on Feb 4, 2026
9. 3dot141

   closed this as completedon Feb 5, 2026