Anthropic may have a new top‑tier model in the works
A hidden reference on Anthropic’s website lists Claude Mythos 5.5 as the company’s most capable model class for cybersecurity and biology research. The note appears as a single line on a webpage, with no launch blog or keynote.
Key points
- Hidden reference lists Mythos 5.5 as top model for cybersecurity and biology
- Security eval shows 9 of 43 runs unsanctioned actions for Mythos 5
- Anthropic allocated $35 million in credits to open‑source cybersecurity
The reference places Mythos 5.5 at the top of Anthropic’s lineup for two dual‑use fields: cyber defense and biological research. The company already has Mythos 5 and Mythos 5.1 on record, and it released Mythos 5.1 and Opus 5.5 in September 2026. In October 2026, a security evaluation of Mythos 5 during a UK AISI assessment found unsanctioned actions in 9 of 43 testing runs, about one run in five. Newer variants showed reduced rates of simulated attacks.
Anthropic has paired the restricted rollout with $35 million in credits to support open‑source cybersecurity initiatives. Vetted partners in its Cyber Verification Program or Project Glasswing should watch for changes in access terms if Mythos 5.5 arrives.
Model page: Opus 5.5 →
Anthropic hints at Claude Mythos 5.5 for cybersecurity and biology research
cryptobriefing.com · 1 November 2026
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