Hidden Claude Mythos 5.5 line found on Anthropic’s site
A hidden mention of Claude Mythos 5.5 sits on Anthropic’s official Mythos page, according to a post by the X account kimmonismus, which quotes it as “Our most capable model class for cybersecurity and biology research.” The evidence is one page string spotted by one account. The poster labels the idea of a release next week, with Fable 5.5 alongside, as speculation.
The public page lists Claude Mythos 5 as the latest update to Mythos Preview, with gains in cybersecurity, biology and healthcare benchmarks. It’s available only to a small group of vetted partners.
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