[Regression] Claude 4.5 Opus disappeared from VS Code dropdown (Works in Visual Studio/IntelliJ)

[ThanhNguyxn]

Description: I am reporting a regression issue. I was previously using Claude 4.5 Opus (Preview) in VS Code without any problems, but it has recently disappeared from the model selector dropdown.

Current State:

My account has access to recent models (GPT-5, Gemini 3 Pro, etc.), and they appear correctly.

However, Claude 4.5 Opus is missing from the list.

My GitHub Copilot settings on the web show "Anthropic Claude Opus 4.5 (Preview)" as Enabled.

Evidence of Issue (Isolated to VS Code Client): The issue is strictly specific to the VS Code client, as verified by the following:

Works in Visual Studio 2022 & IntelliJ: I verified that Claude 4.5 Opus is available and functioning perfectly on my other IDEs.

Portable Mode Test (Clean Environment): I downloaded a fresh VS Code Portable (Zip), created a clean data folder (no settings sync), installed only the Copilot Chat extension, and logged in. Opus 4.5 is still missing.

Troubleshooting Steps Performed (None worked):

Reinstallation: Uninstalled and reinstalled the GitHub Copilot Chat extension multiple times.

Authentication: Signed out and signed back into my GitHub account within VS Code.

Cache Clearing: Deleted the local cache at %APPDATA%\Code\User\globalStorage\github.copilot-chat.

Version Check: Verified I am on the latest version of VS Code and the Extension.

Conclusion: Since the model works in Visual Studio 2022 but fails in a completely fresh VS Code installation, this suggests a specific server-side provisioning error or a disabled feature flag for my User ID on the VS Code endpoint.

Attachments:

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Please investigate why the Opus 4.5 flag was dropped for my VS Code client.

[github-actions[bot]]

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