Anthropic says Claude Mythos 5 designed quantum circuits that used fewer qubits and fewer gates than the best previously published algorithms across eight test problems. The tasks covered chemistry, optimization, physics simulation and number theory.
How Claude searched for cheaper circuits
Researchers gave the model plain-language specifications and put it in a closed loop with an automated evaluator. The evaluator checked whether each proposed circuit was correct, scored its resource use and returned the result for another round. Anthropic says the general experiments ran without human input between iterations, though researchers sometimes had to encourage the model to explore less conservative approaches.
A 53-hour experiment focused on elliptic-curve point addition. With minimal human involvement and occasional prompts, Claude produced a circuit that used 12% more qubits but 17 times fewer gates than the comparison design. That is a trade-off, not an across-the-board reduction.
Another result targeted a decoder used in decoded quantum interferometry. Anthropic reports a twelvefold reduction in gate count. About one in 10,000 sample decodings required more memory than the circuit reserved and failed, which the task's specification allowed.
What the result does not mean
The work improves the instructions a quantum computer would execute. It does not amount to a new quantum processor or proof that a practical machine is ready. Anthropic describes circuit design as only one component of a useful quantum computer.