Anthropic has officially released Claude Fable 5 for everyone.
This marks the public availability of Anthropic’s most powerful Mythos-class AI model release. Previously, companies called the model “too dangerous” for general use.
In April, the tool was privately released to the public, alarming technology, financial and government executives.
Acknowledging the risks, Anthropic said: “Releasing such a high-performance model carries risks. Without safeguards, Fable 5’s capabilities in areas such as cybersecurity could be misused and cause serious harm. So we released the model with safeguards that mean queries on certain topics will instead be answered by our highest-performing model, Claude Opus 4.8.”
Limited access for cyber defenders
Anthropic also launched Claude Mythos 5 for a small group of cyber defenders and infrastructure providers, the same model without cybersecurity restrictions. The tool is deployed via the Glasswing project in association with the US government.
During its initial testing, Mythos identified more than 10,000 critical security vulnerabilities.
Pricing and availability
The model costs $10 per million input tokens and $50 per million output tokens. This price is less than half the price of the previous version.
Anthropic’s private valuation is reportedly near $1 trillion as it prepares for an unexpected public offering.
