Release dates
— Claude Fable 5 reached general availability alongside Mythos 5. ↗
Claude Fable 5
A Mythos-class model made generally available with conservative safeguards for software engineering, research, and complex knowledge work.
MODEL NUMBER014
- First public date
- 2026-06-09
- Organization
- Anthropic
- Family
- Claude
01
Specifications
Only published specifications are shown.
- Input modalities
- Text · Image
- Open weights
- No
- Status
- Legacy
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
Model capabilities
Long-horizon agentCoding
Product features
Research
Unclassified tags
Adaptive safeguards
04
Release history
Claude Fable 5 reached general availability alongside Mythos 5.
View source05
Related models
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06
Sources
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