Summary
On October 7, 2026, GitHub made Anthropic's Claude Haiku 5.5 available as a model choice in GitHub Copilot, giving developers a faster, lower-cost Claude option inside Copilot's chat and agent workflows.
What changed
Claude Haiku 5.5 became selectable as a model in GitHub Copilot.
Why it matters
Adding a small, fast frontier model widens Copilot's model menu toward cheaper, latency-sensitive tasks and reflects GitHub's continued multi-model strategy rather than a single-provider default.
Evidence excerpt
Claude Haiku 5.5 is now available as a model option in GitHub Copilot.