GitHub Changelog
6/29/2026

The original title is: "Claude Opus 4.8 (fast mode) is now in preview for GitHub Copilot"
Original: Claude Opus 4.8 (fast mode) is now in preview for GitHub Copilot
Short summary
Claude Opus 4.8 fast mode is rolling out in preview on GitHub Copilot, delivering significantly faster output token speeds while maintaining the same intelligence as standard Opus. The optimization targets code generation workflows in IDE environments. The announcement lacks details on general availability timeline or rollout phases beyond the current preview.
- •Claude Opus 4.8 fast mode now in GitHub Copilot preview
- •Faster output speeds with preserved model intelligence
- •No timeline disclosed for general availability
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