Anthropic · Claude
Claude Fable 5
ActiveReleased 16 days ago· Jun 9, 2026Multimodal model
First publicly available Mythos-class model (above Opus); Mythos 5 weights with safety classifiers active. 1M context, $10/$50, highest benchmarks of any GA model. Refusals return stop_reason refusal; mandatory 30-day retention.
- API string
- claude-fable-5
- Context window
- 1M ctx
- Knowledge cutoff
- Jan 1, 2026
- Tier
- Flagship
- Released
- Jun 9, 2026
Release & change timeline
1 event- Release
Claude Fable 5 released
First publicly available Mythos-class model; Mythos 5 weights with safety classifiers active.
Part of the Claude version timeline. Catch Me Up — everything that changed across AI & smart home ↗