Anthropic model discovers state-of-the-art quantum circuits

What happened.Anthropic published research demonstrating that Claude Mythos 5 designed quantum circuits that cut gate counts up to 17 times over prior benchmarks.
Why it matters.Quantum computing teams face severe hardware limits in coherence time and gate fidelity. Automated circuit discovery proves foundation models can optimize esoteric low-level algorithms that human mathematicians failed to spot.
The technical specifications:
- Evolutionary search: Researchers ran an automated loop using Python evaluators across eight quantum compilation problems without human intervention between rounds.
- Gate reduction: The model discovered architectures reducing Toffoli gate requirements from 4 times to over 9,000 times on seven of eight benchmark tasks.
- Divsteps algorithm: In prime-field modular inversion, the system adapted classical integer divsteps to yield reversible circuits with minimal qubit overhead.