Model
Claude Mythos 5.2.
Power
£££
API cost
by Anthropic · released 9 November 2026
In plain English
The same underlying model as Fable, with fewer safeguards and access only for approved organisations.
Good for
Approved high-end cybersecurity and life sciences work.
Things to be aware of
It's a specialist model for verified organisations, not something you'd buy for the office.
What Anthropic says
“Mythos has the same capabilities and specifications as Fable, but restricted availability.”
- Context window
- 1.0M tokens
- Knows up to
- June 2026
- Run it yourself
- No, approved organisations only
- API price
- $8 in / $40 out
- per million tokens