GitHub’s changelog from today puts Claude Haiku 5.5 in Copilot’s model picker, including Visual Studio Code, Copilot CLI, the cloud agent, and github.com. Business and Enterprise admins can keep it off by turning off default model enablement or by disabling this model. Rollout is gradual.

Auto is another table. I fetched the live supported models markdown (HTTP Date Thu, 08 Oct 2026 01:03:29 GMT, no last-modified). Haiku 5.5 is GA in the main list. Auto still lists Claude Haiku 4.5 and does not list 5.5. The minimum IDE versions row for Haiku 5.5 is TBD on Visual Studio Code, Visual Studio, JetBrains, Xcode, and Eclipse. I didn’t open Copilot.

Pricing already has the 100k split: $0.10 input at or under 100k tokens, $0.50 over.