Anthropic Releases and Temporarily Suspends Claude Fable 5
Quick Answer
Anthropic's Claude Fable 5, the first public model in the Mythos class, was launched on June 9, 2026, but was quickly suspended due to a U.S.
Quick Take
government export directive. It features a 1 million token context window, advanced autonomy for long-horizon tasks, and a mandatory 30-day data retention policy, causing friction with partners like Microsoft.
Key Points
- Claude Fable 5 has a 1 million token context window and 128,000 output tokens per request.
- The model is priced at $10 per million input tokens and $50 per million output tokens.
- Mandatory 30-day data retention policy created conflicts, notably with Microsoft’s zero-retention standard.
- Fable 5 was temporarily suspended after a jailbreak was flagged to the White House.
- Anthropic's Project Glasswing identified over 10,000 critical vulnerabilities in a month.
Source Excerpt
On June 9, 2026, Anthropic launched Claude Fable 5, a model designed for long-horizon tasks, but it was taken offline shortly after due to a U. S. government export directive. It shares architecture wi
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