Model and API retirements

Within 30 days64Firm dates ahead558

64 within 30 days · 558 firm dates ahead

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

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

Vendor page

Dates

Checked Nov 9, 2026 on GitHub's page
RetiredJun 29, 2026 (retired)
ReplacementLatest Claude Opus model in fast mode
What it isClaude Opus 4.6 (fast mode) (preview) stopped answering on GitHub Copilot.
Sourcedocs.github.com/en/copilot/reference/ai-models/supported-models

Changes

ReplacementUnverified

GitHub changed the replacement for Claude Opus 4.6 (fast mode) (preview) from Claude Opus 4.8 (fast mode) (preview) to Latest Claude Opus model in fast mode.

Oct 5Source

Around the same time on GitHub Copilot

GitHub
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GPT-4.1

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retiredJun 1
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GPT-5.2

Stopped answering on GitHub Copilot.

retiredJun 5
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GPT-5.2-Codex

Stopped answering on GitHub Copilot.

retiredJun 5
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Gemini 2.5 Pro

Stopped answering on GitHub Copilot.

retiredJul 31
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Gemini 3 Flash

Stopped answering on GitHub Copilot.

retiredJul 31