List models uses incorrect URL for GitHub Enterprise.

[Divitum]

Describe the bug

Copilot CLI on an enterprise account attempts to list models using a non-enterprise URL and gets 401 unauthorized.

Affected version

GitHub Copilot CLI 1.0.81.

Steps to reproduce the behavior

1. Run copilot -p "hello" on an enterprise account and a company VPN.
2. It immediately responds with:

Error: Authentication failed (Request ID: 554C:1ECD:2F6B18C:3939587:6A9160A9)

Your GitHub token may be invalid, expired, or lacking the required permissions.

To resolve this, try the following:
  • Start 'copilot' and run the '/login' command to re-authenticate
  • If using a Fine-Grained PAT, ensure it has the 'Copilot Requests' permission enabled
  • If using COPILOT_GITHUB_TOKEN, GH_TOKEN or GITHUB_TOKEN environment variable, verify the token is valid and not expired
  • Run 'gh auth status' to check your current authentication status

3. Check the session logs, and see it attempts to list models from non-enterprise url api.githubcopilot.com

2026-08-28T12:16:10.529Z [DEBUG] [rust:hyper_util::client::legacy::pool] pooling idle connection for ("https", copilot-api.company.ghe.com)
2026-08-28T12:16:10.530Z [DEBUG] [rust:rmcp::transport::streamable_http_client] server doesn't support sse, skip common stream
2026-08-28T12:16:11.290Z [DEBUG] [rust:hyper_util::client::legacy::pool] pooling idle connection for ("https", api.githubcopilot.com)
2026-08-28T12:16:11.293Z [ERROR] Error loading models: Error: 401 "unauthorized: AuthenticateToken authentication failed\n"

Expected behavior

List models should go to the enterprise endpoint and authorization should not fail.

Additional context

• Copilot chat mode works as expected.
• I do have all host and token environment variables appropriately set.
• Operating System: MacOS Tahoe 26.5.1
• Shell: ZSH
• Logs: process-1787919365074-31888.sanitized.log