Claude Sonnet 3.5 retirement date and replacement

Name: Claude Sonnet 3.5 retires (GitHub Copilot)
Start: 2025-11-06
End: 2025-11-06

GitHub Copilot · Model · retired Nov 6, 2025 (retired)Unverified

Dates

Checked Sep 25, 2026 on GitHub's page

Retired	Nov 6, 2025 (retired)
Replacement	Claude Haiku 4.5
Notice	Retirement date; Model retirement history
Source	docs.github.com/en/copilot/reference/ai-models/supported-models

Date	Change	Source
Sep 25	Announced2025-11-06UnverifiedRetirement date; Model retirement historySource	Source

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