Anthropic said Claude improved eight quantum circuit designs, including reductions in qubits and gates, with some gains reaching an order of magnitude.

Anthropic said Claude found new quantum circuit designs that improve on the best published versions across eight tasks, with some gains reaching an order of magnitude or more. The company said the results could reduce the qubits and gates needed for useful quantum applications, a constraint that has kept many algorithms beyond current hardware.

In a research note published on 16 Oct. 2026, Anthropic said it gave Claude plain-language specifications for eight circuits spanning chemistry, optimization, physics simulation, number theory and numerical computing, along with an automated evaluator that checked correctness and scored each design. The company said Claude Mythos 5 worked in a closed loop, proposing designs, receiving feedback, and improving them without human input between rounds.

Anthropic said the model produced novel circuits that used both fewer qubits and fewer gates than the best previously published algorithms. In one case involving elliptic-curve point addition, the company said Claude developed a new reversible modular inversion method after 53 hours of work with limited human prompting. Anthropic said one of the resulting designs used 12% more qubits than the smallest prior design but required 17 times fewer gates, while broader variants expanded the Pareto frontier of available trade-offs.

The company also said Claude redesigned a key step in decoded quantum interferometry, a quantum optimization approach. According to Anthropic, Claude replaced the extended Euclidean algorithm with Berlekamp-Massey decoding and reduced the decoder's gate count by a factor of 12 versus Google Quantum AI's previous construction.

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