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Claude Opus 4.6 (fast mode) (preview) retirement date and replacement

GitHub Copilot · Model · retired Jun 29, 2026 (retired)Unverified

Vendor page

Dates

Checked Sep 25, 2026 on GitHub's page
RetiredJun 29, 2026 (retired)
ReplacementClaude Opus 4.8 (fast mode) (preview)
NoticeRetirement date; Model retirement history
Sourcedocs.github.com/en/copilot/reference/ai-models/supported-models

Changes

DateChange
Sep 25Announced2026-06-29UnverifiedRetirement date; Model retirement historySource

Around the same time on GitHub Copilot

GitHub
  • GPT-4.1UnverifiedGitHub CopilotModelGPT-5.54mo agoJun 1
  • GPT-5.2UnverifiedGitHub CopilotModelGPT-5.54mo agoJun 5
  • GPT-5.2-CodexUnverifiedGitHub CopilotModelGPT-5.3-Codex4mo agoJun 5
  • Gemini 2.5 ProUnverifiedGitHub CopilotModelGemini 3.8 Flash56d agoJul 31
  • Gemini 3 FlashUnverifiedGitHub CopilotModelGemini 3.6 Flash56d agoJul 31

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