Models & Labs
Claude Haiku 5.5 arrives in GitHub Copilot
GitHub Changeloghigh confidence
Why it matters
- →Haiku 5.5 offers a faster, cheaper alternative to Sonnet 5 for routine coding tasks in Copilot.
- →Availability across major IDEs and mobile apps expands its utility for developers.
- →Admin controls allow enterprises to manage model access and costs effectively.
Anthropic has made Claude Haiku 5.5 generally available in GitHub Copilot, positioning the lightweight model for fast, high-volume coding tasks such as subagents and terminal operations. According to early testing, Haiku 5.5 matches the performance of Claude Sonnet 5 on many coding tasks while using fewer tokens and steps. The model is accessible to Pro, Business, and Enterprise users across major IDEs including VS Code, JetBrains, and Xcode, with a gradual rollout beginning now. Administrators can manage access through Copilot settings, where new models are enabled by default unless explicitly disabled.
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Earlier coverage that leads up to this article, and what followed. Lines connect each piece to the closest one after it, converging here.
How we got here
- 1GitHub Copilot App Now Supports Any Model Provider
Matt Wolfe · June 10, 2026 · Related
- 2Anthropic launches Claude Sonnet 5 for affordable AI agents
TechCrunch AI · June 30, 2026 · Related
- 3Claude Opus 5.5 arrives in GitHub Copilot
GitHub Changelog · September 22, 2026 · Same story
- 4Anthropic releases official Claude Code playbook for Opus 5.5
Duncan Rogoff · September 23, 2026 · Related
- 5Claude Sonnet 5.5 arrives in GitHub Copilot
GitHub Changelog · September 28, 2026 · Same story
- 6Anthropic Sonnet 5.5 narrows gap with Opus at half price
The Rundown AI · September 29, 2026 · Related
- 7Claude Code v2.1.284 adds Sonnet 5.5
Claude Code Releases · September 30, 2026 · Same story
- 8Anthropic Releases Claude Sonnet 5.5 and Code Mods
Matt Wolfe · October 2, 2026 · Related
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