Anthropic (ANTH.PVT) launched its most powerful AI model yet on Tuesday. Called Claude Fable 5, the software is the first of the company’s so-called Mythos-class models.
Anthropic initially revealed its Claude Mythos Preview in April, noting that it proved particularly adept at finding vulnerabilities across every major operating system and web browser, despite not being designed for cybersecurity.
To combat the potential threat that Mythos-like AI models could be used to break into critical infrastructure systems, Anthropic launched Project Glasswing, a collaboration between the company, Amazon (AMZN) Web Services, Apple (AAPL), Google (GOOG, GOOGL), Cisco (CSCO), Microsoft (MSFT), JPMorgan Chase (JPM), and other organizations.
As part of the effort, Anthropic provided the firms with early access to Mythos Preview so they could use it to find and address vulnerabilities in their software.
Unlike Mythos Preview, however, Anthropic said Claude Fable 5 will receive a general public release. That’s because the company said it has instituted safeguards in the model that block responses to “high-risk areas” such as cybersecurity and biology.
If users ask questions about those topics, they’ll receive responses from Anthropic’s Claude Opus 4.8 model.
The company said it conducted extensive testing to determine whether users can trick Fable 5 into providing answers it shouldn’t. Anthropic said it also ran an external “bug bounty” program with more than 1,000 hours of testing, during which no one found a universal jailbreak for the model.
It also worked with external organizations to see if they could trick the model, to no avail.
In addition to Claude Fable 5, Anthropic said users that were given access to Mythos Preview as part of Project Glasswing will be upgraded to Mythos 5.
The company said it will cost $10 per million token inputs and $50 per million output tokens to access both Fable 5 and Mythos 5.
Anthropic’s latest models come a week after the company announced it filed confidential paperwork for its initial public offering.
Email Daniel Howley at dhowley@yahoofinance.com. Follow him on Twitter at @DanielHowley.
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