GPT-5.4 is generally available in GitHub Copilot - GitHub Changelog
… May.07 Retired Upcoming deprecation of GPT-4.1 copilot May.07 Retired Claude Sonnet 4 deprecated copilot May.07 Improvement Rubber Duck in GitHub Copilot CLI now supports more models copilot May.06 Improvement Enterprise-managed plugins in GitHub Copilot CLI are now in public preview client apps co…