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Anthropic launches Claude Fable 5 and Mythos 5
A shared model reaches users through general and restricted access tiers.
Model labAnthropic
AnthropicTopics
OCCURRED9 Jun 2026
PUBLIC ACCOUNT9 Jun 2026
EVIDENCEFirst-party account
About these dates
Date of the developer announcement or dated release record.
Anthropic introduced Fable 5 for general availability and Mythos 5 for selected partners, describing gains in coding, scientific work and longer tasks. Both use the same underlying model, with different safeguards and access conditions. Anthropic ↗
Anthropic subsequently reported that Fable 5 access had been suspended on June 12 following US export controls and restored globally on July 1. Anthropic ↗
Sources & attribution
- Organizational disclosure 9 Jun 2026Anthropic launches Claude Fable 5 and Mythos 5 ↗
Anthropic. Original developer announcement.
- Organizational disclosure 30 Jun 2026Redeploying Fable 5 ↗
Anthropic. Original developer announcement.