Summary
Sonnet 5.5 became available to Copilot Pro, Pro+, Max, Business and Enterprise users, subject to gradual rollout and administrator controls. GitHub lists availability across Visual Studio Code, Visual Studio, Copilot CLI, the coding agent, the Copilot app, github.com, mobile, JetBrains, Xcode and Eclipse.
Why it matters
The rollout makes a new coding model broadly interchangeable across the developer tools where teams already manage repositories, reviews and agent sessions.
Related coverage
- Claude Sonnet 5.5 launches with a major coding-efficiency jump
- GitHub Copilot CLI 1.0.89 expands model choice and MCP resilience
- Claude Code 2.1.284 makes Sonnet 5.5 the default and hardens MCP recovery