GitHub Copilot Weekly Releases, October 5: Claude Haiku 5.5, Separate Accounts, Side-by-Side Agent Sessions

GitHub published its weekly Copilot release roundup for the week of October 5, bundling several account, CLI, and VS Code updates.

Details

• Claude Haiku 5.5: now available to Copilot Pro, Pro+, Max, Business, and Enterprise users
• Local sandboxing (GA): restricts what agents can reach — files, networks, and credentials — across Copilot CLI, the Copilot app, and VS Code sessions using Agent Host, at no extra cost
• Separate accounts in the Copilot app: lets users pair one GitHub account for their Copilot license with a different account for accessing repositories, such as an enterprise-provided license used alongside a personal account
• Local model discovery in Copilot CLI: the /model command lists models from a running local Ollama instance alongside configured cloud models
• Side-by-side agent sessions in VS Code 1.141: the Agents window can arrange sessions in a grid to compare results or track multiple tasks at once
• Worktree cleanup in VS Code 1.141: an “Open worktree cleanup” option in chat shows how much disk space inactive session worktrees use and lets users choose which to delete

What happened next

Most individual items in this roundup — Claude Haiku 5.5, local sandboxing GA, and local model discovery — were already covered here as standalone releases; the genuinely new items are the separate-account support and the VS Code 1.141 session-management features (side-by-side sessions and worktree cleanup), continuing GitHub’s incremental polish of multi-session agent workflows.