RSA-896
The gist
Researcher Stephen A. Weis factored RSA-896, a 270-digit semiprime, using Anthropic's Claude AI.
The record moved 862 to 896 bits, but deployed keys face no new threat.
How it unfolded
- 1991 -2007The RSA Factoring Challenge ran; the $75,000 prize once attached to RSA-896 is long gone.
- Sep 3, 2026Eric Lu of Cognition used Devin AI agents to factor the 862-bit RSA-260 number, setting the previous record.
- Sep 19, 2026Stephen A. Weis factored RSA-896, a 270-decimal-digit semiprime, with help from Anthropic's Claude; the run finished on September 19, 2026.