# GitHub — GitHub Copilot weekly releases — August 31

- Company: GitHub (github.com)
- Announced: 2026-09-04T21:05:01+00:00
- Category: capability-change
- Coverage: not counted
- Announcement: yes
- Group: announcements
- Source: https://github.blog/changelog/2026-09-04-github-copilot-weekly-releases-august-31
- Record: https://forck.live/items/8397-github-copilot-weekly-releases-august-31
- Subject: Copilot
- Models affected: Claude Fable 5.1, Gemini 3.8 Flash

GitHub Copilot expands model choice with Claude Fable 5.1 and Gemini 3.8 Flash, adds content exclusions, makes the Copilot harness generally available in JetBrains, introduces Agent Merge in public preview, and adds experimental multi-root workspaces, chat backgrounds, and chat sessions.

## Evidence

Verbatim from https://github.blog/changelog/2026-09-04-github-copilot-weekly-releases-august-31:

> This week, GitHub Copilot expands model choice and content protections, while VS Code adds new ways to manage agent sessions and get pull requests merge-ready.

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Record: https://forck.live/items/8397-github-copilot-weekly-releases-august-31
Catalogue: https://forck.live/llms.txt
Current issue: https://forck.live/feed.md