Anthropic just shipped Claude Fable 5 (June 9, 2026).
This is the public version of their powerful Mythos model, now available with strong built-in safeguards. It’s state-of-the-art across the board, with standout performance in:
- Software engineering (80.3% SWE-Bench Pro)
- Long-context agentic workflows
- Vision and complex reasoning
- Large, multi-day projects
Developers are already reporting it one-shots full apps and handles massive codebases better than anything before.
Model name for API: claude-fable-5
It’s significantly stronger than Opus 4.8 on hard tasks, though more expensive. Perfect for serious coding, refactoring, and autonomous agent work.
If you’re building real products, go try it in Claude or Cursor today.
What are you planning to build with it first?
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