Unverified50% confidenceFactExact time
Anthropic's Mythos-class model was ready as early as February, but full availability was delayed until June, during which time it was provided only to a few partners for cyber defense.
1
Sources
50%
Confidence
Short-term (~14 days)
Relevance
10/21/2026
First Seen
Valid until: 11/4/2026
Sources
Related Entities
Related Claims
UnverifiedA leaker claims that Anthropic partners have recently been granted access to Fable 5.5, speculating that the model may be released next week.55% similarUnverifiedOpenAI's notice states that fine-tuned versions of these models follow the same retirement schedule as the base models, namely January 14, 2027.55% similar
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