Anthropic Email Reveals Claude Mythos 5.1, Opus 5.5, Sonnet 5.5 in Expanded Cyber Verification Program
Sauers_ · x · 2026-10-20
A user shared an Anthropic email announcing the expanded Cyber Verification Program with three access tiers, now covering the company's most capable cybersecurity models: Claude Mythos 5.1, Claude Opus 5.5, and Claude Sonnet 5.5, plus newly granted Defense Access.
The previously unseen "Claude Mythos 5.1" model name is drawing attention.
More from Models
- Day-one $200 Codex subscriber downgrades for the first time, citing compute shortfall — karmay007 · 2026-10-20
- DeepSeek V4.1 Flash ships a two-stage refusal guardrail, uncensoring effort finds — cephaloform · 2026-10-20
- Meta releases Muse Glimmer, a 30B open-weight agentic model that runs on a single consumer GPU — AIatMeta · 2026-10-20
- Maxwell debuts as 'world's first Code Execution Model', early access open — tri_dao · 2026-10-20
- d1-ultra tops Artificial Analysis Decision Index by a wide margin — JosephJacks_ · 2026-10-20
- Deutsche Bank: Meta's Muse still leads ChatGPT in downloads and DAUs 36 days post-launch — alexandr_wang · 2026-10-20