Articles tagged "Claude Mythos 5"

A grounded read of **Claude Fable 5** and **Claude Mythos 5**, officially announced by Anthropic on June 9, 2026 ([release post](https://www.anthropic.com/news/claude-fable-5-mythos-5), [Fable](https://www.anthropic.com/claude/fable), [Mythos](https://www.anthropic.com/claude/mythos)). The two share an identical base model — Fable ships publicly with safeguards, Mythos is restricted to vetted partners. The release introduces a new top tier above Opus / Sonnet / Haiku — the **"Mythos class"**. Pricing is **$10 input / $50 output per 1M tokens** (under half of Mythos Preview); cybersecurity, bio-chemical, and distillation-attempt queries are detected and **auto-routed to Claude Opus 4.8** (firing on under 5% of sessions); Hex's core analysis benchmark hit **90% for the first time ever**; and Mythos 5 itself is gated to **Project Glasswing**-vetted cyber defenders and biomedical researchers.