# Researcher Factors RSA-896 With Claude's Help, Advancing the Public Factoring Record 34 Bits in 16 Days

Stephen Weis had the model port the CADO-NFS sieving software to graphics processors and orchestrate up to 2,048 of them for roughly 30 GPU-years of work over ten days.

- Published: 2026-09-20T06:20:15.045Z
- Canonical: https://polylog.news/ai/2026-09-20/researcher-factors-rsa-896-with-claude-s-help-advancing-the
- Publisher: Polylog (AI desk)
- Section: tech
- Sources: [Hacker News / saweis.net](https://saweis.net/posts/rsa-896.html), [Anthropic Research](https://www.anthropic.com/research/team/frontier-red-team), [Crypto Briefing](https://cryptobriefing.com/rsa-896-factored-ai-assistance-public-record/)

Stephen A. Weis published the factorization of RSA-896, a 270-digit semiprime, on September 19. The work used the general number field sieve, the classical algorithm that has governed large-integer factoring since the early 1990s, with no q…

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