Claude Mythos 5 designed an elliptic-curve quantum circuit using 17x fewer gates for 12% more qubits.

Andi Gu, a Harvard physics researcher, ran it through Anthropic’s STEM Fellows Program, which pairs scientists with Anthropic staff to test whether Claude can do real research in their field.

Claude wrote circuit designs as code, an evaluator checked and scored them, and Claude kept revising until it beat human-designed records in most of the 8 tasks. Its strongest result made an elusive classical math shortcut work on quantum hardware for the first time, after Claude proved new identities and verified them with formal proofs.