Anthropic has officially released Claude Fable 5 for everyone.
This marks the public availability of the version of Anthropic’s most powerful Mythos-class AI model. Previously, companies labeled the model “too dangerous” for general use.
In April, the tool was launched privately, causing alarm among technology, financial and government leaders.
Acknowledging the risks, Anthropic said: “Launching a model with this capability carries risks. Without safeguards, Fable 5’s capabilities in areas such as cybersecurity could be misused to cause serious harm. Therefore, we have released the model with safeguards that mean queries on some topics will receive a response from our next most capable 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 implemented through Project Glasswing in partnership with the US government.
In its first tests, Mythos identified more than 10,000 critical security flaws.
Prices and availability
The model is priced at $10 per million tokens in and $50 per million tokens out. It is priced less than half the cost of the previous version.
Anthropic’s private valuation is reportedly approaching $1 trillion as it prepares for an unexpected public offering.
