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AI summary
Written by AI from the official notes. Check them for exact details.Anthropic released Claude Fable 5 and Claude Mythos 5, enhancing model capabilities and context handling.
- Claude Fable 5 is the most capable widely released model.
- Claude Mythos 5 is available for Project Glasswing participants.
- Both models support a 1M token context window by default.
- Models have a maximum output of 128k tokens.
- Always-on adaptive thinking is included.
Why it matters: Users seeking advanced AI capabilities should explore these new models for improved performance.
Full release notes
We've launched Claude Fable 5 (claude-fable-5), our most capable widely released model, alongside Claude Mythos 5 (claude-mythos-5) for Project Glasswing participants. Both models support a 1M token context window by default, 128k max output tokens, and always-on adaptive thinking. See Introducing Claude Fable 5 and Claude Mythos 5 for capabilities, API changes, and availability.