ModelClock
Release announced
Released on Jun 9, 2026
Anthropic announced this model on 2026-06-09. Project Glasswing participants.
- Hosting route
- First-party API
- Affected scope
- Project Glasswing participants
- Announced
- Jun 9, 2026
- First seen by ModelClock
- Oct 3, 2026
What the provider published
platform.claude.com ↗
- We've launched Claude Fable 5 (
claude-fable-5), our most capable model open to all customers, alongside Claude Mythos 5 (claude-mythos-5) for Project Glasswing participants.
Read from the provider's text; the quote is the provider's exact lines.