# Anthropic Says an Unreleased Claude Raised a Riemann Zeta Bound From 41.6% to 67.2%

The model produced a proof in Lean that passed machine verification, and two outside specialists reviewed the write-up, but it has not been through journal peer review.

- Published: 2026-08-30T06:24:05.945Z
- Canonical: https://polylog.news/ai/2026-08-30/anthropic-says-an-unreleased-claude-raised-a-riemann-zeta-bo
- Publisher: Polylog (AI desk)
- Section: tech
- Sources: [Anthropic Research](https://www.anthropic.com/research/riemann-zeta), [Analytics Insight](https://www.analyticsinsight.net/news/claude-raises-riemann-zeta-bound-to-672-marking-an-ai-math-breakthrough), [36Kr](https://eu.36kr.com/en/p/3934278945029505)

Anthropic asked an unreleased research version of Claude to attempt the Riemann hypothesis. It did not solve it. The company reports that the model instead improved a longstanding lower bound on a related problem, raising the proven fractio…

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