Github Copilot Enterprise integration is broken

[Femumme]

Description

Since version v1.3.0, the GitHub Copilot Enterprise integration is broken.

Whenever a request is made, this error occurs:

"undefined/chat/completions" cannot be parsed as a URL.

Plugins

None

OpenCode version

v1.3.0

Steps to reproduce

1. Upgrade to Opencode v1.3.0 or higher
2. Try any query using Github Copilot Enterprise

Screenshot and/or share link

Operating System

macOs 26.3.1

Terminal

iTerm2

[github-actions]

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

• GitHub Copilot Enterprise works in 1.2.4 but fails in 1.3.0 with 400 Bad Request on GHE chat/completions #18935: GitHub Copilot Enterprise broken since v1.3.0 (400 Bad Request on GHE chat/completions endpoint — same regression, open issue)
• GitHub Copilot Enterprise works in 1.2.4 but fails in 1.3.0 with 400 Bad Request #18937: Same issue as above (closed duplicate of GitHub Copilot Enterprise works in 1.2.4 but fails in 1.3.0 with 400 Bad Request on GHE chat/completions #18935)

Both describe GitHub Copilot Enterprise failing after upgrading to v1.3.0, which appears to be the same underlying regression you're experiencing. The error differs slightly (400 Bad Request vs. undefined/chat/completions URL parse error), but both point to a regression in the enterprise provider/model mapping introduced in v1.3.0. Please follow #18935 for updates.

[Femumme]

That is correct - duplication of #18935