From the source

GitHub Copilot weekly releases — October 5

Local sandboxing, multi-account support, and Claude Haiku 5.5 added to Copilot.

Capability change

Image published with the post by GitHub — Image from github.blog

GitHub added Claude Haiku 5.5 for Copilot Pro, Pro+, Max, Business, and Enterprise users.

Local sandboxing for agents is now generally available in Copilot CLI, the Copilot app, and VS Code sessions using Agent Host at no extra cost.

The Copilot app now supports separate GitHub accounts for licensing and repositories.

From the source
Limit agents’ access to files, networks, and credentials with local sandboxing, now generally available in Copilot CLI, the Copilot app, and VS Code sessions using Agent Host. This is included with Copilot at no extra cost.
github.blog

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