Copilot News 09/01/2026 Read AI Rating: High
Claude Fable 5.1 Reaches General Availability in GitHub Copilot
Anthropic's Claude Fable 5.1, the latest model in its Mythos class, is now generally available in GitHub Copilot across 10 surfaces including VS Code, Visual Studio, JetBrains, and Xcode, aimed at long-horizon autonomous coding and deep codebase research.