Problem

A few observations when trying to use AI Bridge with opencode

• gpt-5-codex first screenshot needs v1/responses (May get fixed by Implement the OpenAI /v1/responses #16)
• gpt-5 and gpt-4o 2nd screenshot. Unsupported parameter "max_tokens". Use "max_completion_tokens" instead.
• gpt-4.1 works smoothly

Now I think this could be the same issue with the Cursor not working with GPT-5 and only working with GPT-4.1 #32

GPT-5 Codex

GPT-5 and GPT-4o

How to Reproduce

1. opencode auth login --> Choose Other --> Name it aibridge-openai --> Paste Coder Token
2. Then create a file opencode.json with the following content

   {
     "$schema": "https://opencode.ai/config.json",
     "provider": {
       "aibridge-openai": {
         "npm": "@ai-sdk/openai-compatible",
         "name": "AI Bridge",
         "options": {
           "baseURL": "https://dev.coder.com/api/experimental/aibridge/openai/v1"
         },
         "models": {
           "gpt-5": {
             "name": "GPT-5"
           },
           "gpt-5-codex": {
             "name": "GPT-5 Codex"
           },
           "gpt-4.1": {
             "name": "GPT-4.1"
           },
           "gpt-4o": {
             "name": "GPT 4o"
           }
         }
       }
     }
   }