Claude Mythos 5 produced quantum-circuit designs that Anthropic says improved on published designs across eight tasks. One elliptic-curve point-addition circuit used about 17 times fewer gates while using 12% more qubits; a Reed–Solomon decoder for the DQI optimization algorithm used about 12 times fewer gates. Claude also developed a reversible modular-inversion method that avoids storing branch history. Anthropic says it implemented and verified the approach in software. The results have not been validated on actual quantum hardware, so the improvements remain circuit-design results, not demonstrated hardware performance. Anthropic’s research · WuBlockchain’s summary