Azure GPT-5 model: "max_tokens" parameter not supported, need "max_completion_tokens" instead #22623

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1. hueifeng

   added

   bugSomething isn't workingSomething isn't working

   on Apr 15, 2026
2. github-actions commented on Apr 15, 2026

   

   github-actionsBot

   on Apr 15, 2026 – with GitHub Actions

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

   • BUG: gpt-5 azure Unsupported parameter: 'max_tokens' #1697: Same error - Azure GPT-5 'max_tokens' not supported, needs 'max_completion_tokens'
   • @ai-sdk/openai-compatible max_tokens error for GPT 5.x #5421: Same error with @ai-sdk/openai-compatible and GPT 5.x models requiring max_completion_tokens

   Please review these issues to see if your problem is already tracked, and if so, consider adding any additional context there.
3. kobicovaldev commented on Apr 15, 2026

   

   kobicovaldev

   on Apr 15, 2026

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   Similar to what I am seeing here #22374
4. rekram1-node

   self-assigned this

   on Apr 23, 2026
5. refex commented on Apr 28, 2026

   

   refex

   on Apr 28, 2026

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   I solved it using this config

   {
     "$schema": "https://opencode.ai/config.json",
     "model": "azure-foundry/gpt-5.4-2",
     "theme": "opencode",
     "autoupdate": true,
     "provider": {
       "azure-foundry": {
         "type": "openai-compatible",
         "options": {
           "apiKey": "<api-key>",
           "baseURL": "https://myfoundry.services.ai.azure.com/api/projects/myfoundryproject/openai/v1"
         },
         "models": {
           "gpt-5.4-2": {
             "name": "gpt-5.4-2",
             "limit": { "context": 128000, "output": 16000 }
           }
         }
       }
     }
   }

   and a custom opencode plugin

   export const AzureFix = async () => {
     return {
       "chat.params": async (input, output) => {
         output.maxOutputTokens = undefined
       },
     }
   }

   👍React with 👍2Reacted by linchengfu and Ricky
6. darthbeeius

   added a commit that references this issue on Apr 29, 2026

   feat(provider): add Chat Completions API mode for gateway/proxy provi…

   ...

   9a4aeb6
7. thdxr

   removed

   bugSomething isn't workingSomething isn't working

   on May 3, 2026
8. ArchiTecCTT commented on Jun 18, 2026

   

   ArchiTecCTT

   on Jun 18, 2026

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   Related: filed a cloudflare-ai-gateway-specific report in #32776 (built-in provider + pi-ai detectCompat forces max_tokens for all gateway traffic; opencode.jsonc compat overrides ignored).
9. github-actions commented on Aug 18, 2026

   

   github-actionsBot

   on Aug 18, 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.
10. github-actions

    closed this as not plannedon Aug 18, 2026