The author tests Anthropic’s Mythos-class model, Claude 5 Fable, on tasks from epic poems to complex isochrone maps and research calibration software. Fable autonomously delegates work to cheaper agents, executes multi‐hour workflows, and produces sophisticated outputs, but its decision process remains a black box, shifting the user’s role from hands‐on builder to outcome judge.

Security researchers found that Anthropic’s new Mythos AI model was reachable by unauthorized users through exposed API endpoints. This lapse could expose sensitive prompts and responses, prompting Anthropic to investigate and strengthen its access controls.

Jack Clark, Anthropic’s co-founder and head of public benefit, confirmed the company briefed the Trump administration on its withheld Mythos model due to its powerful cybersecurity capabilities. He downplayed the Pentagon’s “supply-chain risk” label while defending continued government engagement and also discussed AI’s potential impact on jobs and higher education.

Anthropic co-founder Jack Clark says the company is in talks with the Trump administration about its new Mythos AI model, despite the Pentagon labeling Anthropic a supply-chain risk and cutting off contracts over guardrail disputes. Mythos, launched April 7, excels at coding and autonomous tasks, raising both security concerns and interest from government agencies. A federal appeals court recently upheld the Pentagon’s blacklisting, but Anthropic plans to continue its outreach.