Claude Mythos 5.5 page notation… User guide based on version 5.1

The article reports that Anthropic's Claude Mythos page now displays "Claude Mythos 5.5" in its title, while the announcement list and usage guidance still present Mythos 5.1 as the latest model in the family. As of the 2nd, the page describes the Mythos line as the company's most capable models for cybersecurity and biology research, with the first announcement item dated October 6 covering an expanded cyber verification program and a September 1 entry introducing Mythos 5.1 as the newest Mythos-series model. Eligibility and pricing information also remain based on Mythos 5.1, and Anthropic's model documentation lists only Mythos 5.1 and Mythos 5, with no model ID or separate specifications for Mythos 5.5. The discrepancy suggests a possible early or unintended page update ahead of a formal release. What to watch next: whether Anthropic publishes a model ID, pricing, and specifications for Mythos 5.5, or reverts the page to the 5.1-based documentation.