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Anthropic's (ANTHRO) latest AI model, Claude Mythos, which is also its most powerful, was revealed through a data leak, according to Fortune.

Reports of the new model went public the same night that the Amazon (AMZN) and Google-backed (GOOGL)(GOOG) startup won a court order blocking a Trump Administration ban on government use of its artificial intelligence technology after arguing the move could cost the company billions in revenue.

Anthropic has already allowed some select customers early access to test the new model, the report said. Details of Mythos became known due to a cache of documents that were stored in the company's content management system. It included not-yet published blog posts and other information, such as details for a planned invite-only CEO summit in Europe later this year. Anthropic has since taken steps to secure the data. It was exposed due to a "human error" in the CMS configuration.

"We're developing a general-purpose model with meaningful advances in reasoning, coding, and cybersecurity," an Anthropic spokesperson said, according to the report. "Given the strength of its capabilities, we're being deliberate about how we release it."

"Mythos is a new name for a new tier of model: larger and more intelligent than our Opus models -- which were, until now, our most powerful," according to an unpublished blog post on the new model. "We chose the name to evoke the deep connective tissue that links together knowledge and ideas."

"Although Mythos is currently far ahead of any other AI model in cyber capabilities, it presages an upcoming wave of models that can exploit vulnerabilities in ways that far outpace the efforts of defenders," it read.

Anthropic PBC is also reportedly weighing an initial public offering as soon as October, as it competes with rival OpenAI (OPENAI) in the IPO race.

Data leak reveals Anthropic's latest secret model, Claude Mythos: report