Anthropic Says Research Version of Claude Raised Proven Lower Bound on Riemann Hypothesis Zeros to 67.2%

Anthropic said an unreleased research version of its Claude model helped push a long-standing mathematical benchmark tied to the Riemann hypothesis, raising the proven lower bound on the share of nontrivial zeros satisfying the conjecture from 41.6% to 67.2%. The company disclosed the result on August 10, 2026, stressing that the model did not solve the celebrated open problem but instead delivered a verifiable improvement on a related, well-defined quantity.