'Claude Mythos 5.5' spotted hidden in Anthropic's website HTML, launch rumored next week
haider1 · x · 2026-11-02
'Claude Mythos 5.5' was found in the HTML source of Anthropic's official website — including a hidden page heading and desktop/mobile image references (visible in the screenshot). The tip, shared via kimmonismus, suggests Anthropic may already be preparing Mythos and Fable 5.5 for release next week regardless of whether OpenAI ships something. Unconfirmed leak.
Related event: Anthropic Site Code Leaks Claude Mythos 5.5, With Fable 5.5 Also Surfacing(11 posts)→
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