Latest frontier models — Use Claude Opus 5.5, GPT-6 Sol, and GPT-6 Luna through supported providers, including GitHub Copilot. See Choose a Model.
Grok 4.7 by default for xAI — New xAI sessions now default to Grok 4.7. See Provider Authentication.
Added
Added inherited Claude Opus 5.5, GPT-6 Sol, and GPT-6 Luna support for GitHub Copilot.
Added inherited GPT-6 Sol and GPT-6 Luna support for OpenAI API keys and OpenAI Codex subscriptions.
Added inherited Claude Opus 5.5 support for Anthropic with adaptive thinking and a 1M context window.
Changed
Changed the default xAI model to Grok 4.7.
Fixed
Fixed split-turn compaction summaries being refused by Claude Fable 5.1 by clearly separating the conversation and using continuation-oriented instructions (#9908 by @davidbrai).
Fixed missing or invalid --mode values being silently ignored instead of reporting an error and exiting with a nonzero status (#9045).
Fixed inherited image-only user messages being rejected by some OpenAI-compatible providers because they included an empty text part (#9797).
Fixed inherited Anthropic OAuth requests reporting an outdated Claude Code version.