MythosLM

Independent reference. Not affiliated with, endorsed by, or sponsored by Anthropic PBC. Details.

Claude Mythos: the independent reference for Anthropic’s Mythos-class AI models

What Claude Mythos is, where it stands, and how the pieces fit: plain-language explainers, side-by-side comparisons, live availability mirrors and a glossary for the Mythos-class large language models — Mythos Preview, Fable 5, Mythos 5 and Project Glasswing. Sourced, dated and original — 60 pages and growing.

Mythos / Fable access: Suspended Details →

Derived from live data (Anthropic Statuspage) as of . Canonical verdict: anthropicmythos.ai/status ↗.

For breaking news and the canonical live verdict, see our sister site anthropicmythos.ai ↗.

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What is… What is Claude Mythos? Claude Mythos is Anthropic's Mythos-class AI model tier — the level above Opus. What the large language model covers, who can use it, and its status. What is… What is Claude Fable 5? Claude Fable 5 is the public, safeguarded edition of Anthropic's June 2026 Mythos-class model. Same model as Mythos 5, with safety classifiers. Availability & status Is Claude Fable 5 available? Whether Claude Fable 5 is available right now depends on live data — Anthropic's status page drives the verdict. Here's the context and where to check. Comparisons Fable 5 vs Mythos 5: Same Model, Different Safeguards Fable 5 and Mythos 5 share one underlying model — the only real difference is safeguards. Here's what changes and which edition you'd actually use. Project Glasswing Project Glasswing, Explained A plain-language overview of Project Glasswing: Anthropic's restricted program for Mythos-class access, who it serves, how it's priced, and its current status. Specs & benchmarks Fable 5 Pricing: $10/$50 per Million Tokens Explained Fable 5 pricing breakdown: $10 input / $50 output per million tokens after the intro window, free for Pro/Max/Team/Enterprise Jun 9-22, then usage-based.

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