Back in April, Anthropic announced it had built a new AI model, called Mythos, that had an unprecedented ability to find gaps in cybersecurity systems. Citing the risk of the powerful new model falling into the wrong hands, the company initially withheld its public release, only slowly granting access to a small group of early testers through a project known as Project Glasswing. Today, Mythos finally made its first public debut—albeit in a considerably nerfed fashion. Anthropic announced Tuesday that it’s releasing a new model called Claude Fable 5, described in a company blog post as “a Mythos-class model made safe for general use.” The new model’s capabilities across tasks like coding, vision, tool use, legal analysis, and scientific research “exceed those of every model we’ve ever made generally available,” the company wrote. (The implication there is that the most powerful version of Mythos is capable of more, but that it hasn’t (yet) been deemed fit for public availability.) “The longer and more complex the task, the larger Fable 5’s lead over our other models.”
The company has also launched another model called Mythos 5, which has the same capabilities as Fable 5, minus some of the safeguards. That model, however, is for the time being only available to the small cohort of organizations that are part of Project Glasswing, but Anthropic said access will be expanded soon.
