Overview
A Mythos-class model made generally available with conservative safeguards for software engineering, research, and complex knowledge work.
Claude Fable 5
A Mythos-class model made generally available with conservative safeguards for software engineering, research, and complex knowledge work.
MODEL NUMBER010
- Release date
- 2026-06-09
- Organization
- Anthropic
- Family
- Claude
01
Specifications
Only published specifications are shown.
02
Overview
Why it mattered
Fable 5 reflects a move toward layered deployment safeguards, including model fallback, rather than a single refusal policy.
03
Architecture & capabilities
Key capabilities
Long-horizon agentCodingResearchAdaptive safeguards
04
Release history
Claude Fable 5 reached general availability alongside Mythos 5.
View source05
Related models
Select a card to view the related model.
No related models recorded yet
06