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GitHub Copilot's gpt-5-codex model is not accessible via OpenAI /chat/completions endpoint #2778
Closed as duplicate
Description
I'm trying to use GPT-5-Codex within opencode. I have successfully enabled access to the GPT-5-Codex model through my GitHub account settings, but when attempting to use the model in opencode, I'm encounter the below error
AI_APICallError: model gpt-5-codex is not accessible via the /chat/completions endpoint
Steps to Reproduce:
- Enabled GPT-5-Codex model access in GitHub account settings
- Configured OpenCode to use GPT-5-Codex as the model
- Attempted to run opencode with GPT-5-Codex
- Error occurs preventing model usage
Environment
- Opencode version : v0.11.3
- OS: MacOS Tahoe
- Model: gpt-5-codex through github copilot
Activity
github-actions commentedon Sep 25, 2025
This issue might be a duplicate of existing issues. Please check:
Feel free to ignore if none of these address your specific case.