C# SDK - Models list mismatch between SDK downloaded/bundled CLI vs installed system CLI via WinGet

[forestmaxime]

Hi,

Issue context:
Both are connected to the same GH user. When CliPath is null, I do not receive the Opus 4.6 and GPT 5.3 Codex models contrary to when I call it with a specific path pointing to the Copilot CLI installed via WinGet on Windows.

I forced the UseLoggedInUser to false to ensure that it doesn't pick up anything else than the GH Token that I pass in the options from which I do a Device Flow in my application.

CopilotClientOptions options = new()
    {
        GithubToken = token,
        CliPath = cliPath, // passing either null for SDK version OR complete path to WinGet installed version
        UseLoggedInUser = false,
    };

Logs from the DEBUG jsonrpc calls:
Response 1 (first session using CLI via SDK from build directory):

GPT-5.2
GPT-5 mini
GPT-4.1

Response 2 (second session using installed CLI via WinGet):

Claude Opus 4.6
GPT-5.3-Codex
GPT-5.2
GPT-5 mini
GPT-4.1

Expected behavior:
Same list of models returned

[github-actions]

Thanks for reporting this issue, @forestmaxime!

I've labeled this as bug and sdk/dotnet since you're experiencing different model lists depending on whether the .NET SDK uses its bundled CLI versus the WinGet-installed CLI.

This is interesting because both CLIs should be authenticated with the same GitHub token, yet returning different available models. The team will investigate why the bundled CLI isn't exposing Claude Opus 4.6 and GPT-5.3-Codex while the WinGet version does.

A few clarifying questions that might help with debugging:

• What version of the SDK NuGet package are you using?
• What version does the WinGet CLI report (gh copilot --version)?
• Are both CLIs using the same authentication method (you mentioned forcing UseLoggedInUser to false)?

AI generated by Issue Triage Agent

[forestmaxime]

• Currently using Nuget version 0.1.26-preview.0, i had the same issue with a previous stable version
• gh copilot --version is GitHub Copilot CLI 0.0.414
• They are both using the UseLoggedInUser to false