Bug?: New Agents Window model picker does not show all enabled Copilot models (WSL/SSH)

- Copilot Chat Extension Version: latest available / bundled with VS Code 1.127 Stable and 1.128 Insiders
- VS Code Version:
- Stable: 1.127
- Insiders: 1.128
- OS Version: Ubuntu 24.04 / Remote WSL or Linux environment
- Feature (e.g. agent/edit/ask mode): New Agents Window / new agent session model picker
- Selected model (e.g. GPT 4.1, Claude 3.7 Sonnet): N/A — affected models are missing from picker

Steps to Reproduce:

1. Open VS Code with a GitHub Copilot Business/ Pro + account where all models are enabled.
2. Open the regular VS Code Copilot Chat model picker.
3. Confirm that Claude Opus variants are available there, including GPT 5.5, Claude Opus 4.5, 4.6, 4.7, and 4.8.
4. Open the new Agents Window.
5. Start a new session.
6. Open the model picker in the new Agents Window.
7. Observe that some Claude Opus variants and GPT 5.5 shown in the regular Copilot Chat picker are missing from the Agents Window picker.

Expected behavior:

The new Agents Window model picker should show the same enabled Copilot models that are available in the regular VS Code Copilot Chat model picker or clearly explain why specific models are intentionally unavailable in this feature.

Actual behavior:

The regular Copilot Chat picker shows GPT 5.5 or Claude Opus variants as available, but the new Agents Window picker does not show the same set of models.

Additional context:

This does not appear to be a subscription/admin availability issue. The account is a GitHub Copilot Business account with all models enabled, and the same models are visible in the regular VS Code Copilot Chat picker.

I reproduced this in both latest Stable and latest Insiders.

#### **Copilot Chat Model Picker**

#### **Agents Window Model Picker**

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**Update:** I found an important narrowing of the issue.

This only appears to happen in remote sessions.

In my case, when the Agents Window is connected to a remote environment such as WSL, some models are missing from the Agents Window model picker.

However, when I start a new Agents Window session locally,

So this does not seem to be caused by account/subscription/model availability. The models are enabled and visible locally, but the remote Agents Window model picker shows a reduced model list.