Copilot CLI v1.0.83 adds Fable 5.1 support and multi-model agent fallback

copilot-cli-release-app[bot] · ghdev · 2026-09-04

github/copilot-cli v1.0.83 adds support for claude-fable-5.1, lets custom agents list multiple models tried in order with model-policy: required, adds CIMD support for MCP OAuth sign-in, Windows 11 taskbar session cards, enterprise forceLoginOrgs pinning, and sandboxed dev-tool path access (toggleable). Bug fixes cover MCP tools after server restarts, session locks, thinking-signature fallbacks for Anthropic sessions, and more.

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