Anthropic faces a trademark suit over the Mythos name

Anthropic has been sued for trademark infringement over the name of Mythos, its restricted-access model line, Reuters reported on November 13. The name in dispute is on a model Anthropic is selling now: Claude Mythos 5.2 came out on November 9, four days before the suit was reported.

The plaintiff and the relief sought were not identified. The case is about what the model is called rather than how it works. It is also separate from the class action over Claude Max “20x usage” ads, which a federal judge in San Francisco declined to dismiss on November 6.

Mythos 5.2 is available only to organizations verified through Anthropic’s programs, such as the Cyber Verification Program, the company’s platform docs say. It has the same specifications and pricing as Claude Fable 5.2, starting at $8 per million input tokens and $40 per million output tokens. Anthropic describes the two as the same underlying model. Where their results differ, the company says, the gap comes from tasks where Fable 5.2’s safeguards step in.