GitHub on X: "⚡️ @AnthropicAI's Claude Haiku 5.5 is now generally available in GitHub Copilot. ➡️ It's a lightweight model designed for fast, high-volume work like subagents, quick edits, and terminal tasks. ➡️ Our early testing showed that it matched Claude Sonnet 5 on many coding tasks while using significantly fewer tokens and steps. Try it out in the GitHub Copilot app, CLI, or @code. https://t.co/aJXg4oAAz8"

GitHub

@github

⚡️ @AnthropicAI's Claude Haiku 5.5 is now generally available in GitHub Copilot. ➡️ It's a lightweight model designed for fast, high-volume work like subagents, quick edits, and terminal tasks. ➡️ Our early testing showed that it matched Claude Sonnet 5 on many coding tasks while using significantly fewer tokens and steps. Try it out in the GitHub Copilot app, CLI, or @code. github.blog/changelog/2026…

Claude Haiku 5.5 in GitHub Copilot - GitHub Changelog

From github.blog

8:40 PM · Oct 7, 2026·

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