# GitHub — GitHub Copilot weekly releases — September 21

- Company: GitHub (github.com)
- Announced: 2026-09-25T16:42:48+00:00
- Category: capability-change
- Coverage: not counted
- Announcement: yes
- Group: announcements
- Source: https://github.blog/changelog/2026-09-25-github-copilot-weekly-releases-september-21
- Record: https://forck.live/items/13897-github-copilot-weekly-releases-september-21
- Subject: Copilot
- Models affected: Claude Opus 5.5, GPT-6 Sol, GPT-6 Luna, Grok 4.7

GitHub Copilot added Claude Opus 5.5, GPT-6 Sol, GPT-6 Luna, and Grok 4.7 to its model lineup, with availability varying by plan. Local sandboxing for agents entered public preview, and assisted approvals for agent sessions also reached public preview. Updates extended to Copilot in Slack, Microsoft Teams, JetBrains, and VS Code, including model switching mid-conversation, duplicate issue detection, and shared organization skills.

## Evidence

Verbatim from https://github.blog/changelog/2026-09-25-github-copilot-weekly-releases-september-21:

> Limit agents’ access to files, networks, and credentials with local sandboxing, now in public preview.

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Record: https://forck.live/items/13897-github-copilot-weekly-releases-september-21
Catalogue: https://forck.live/llms.txt
Current issue: https://forck.live/feed.md