Simon Willison’s Weblog

Largest known prime number (via) Discovered on 12th October 2024 by the Great Internet Mersenne Prime Search. The new largest prime number is 2^136279841-1 - 41,024,320 digits long.

Posted 2nd January 2025 at 7:39 am

Recent articles

Highlights from my appearance on the Data Renegades podcast with CL Kao and Dori Wilson - 26th November 2025
Claude Opus 4.5, and why evaluating new LLMs is increasingly difficult - 24th November 2025
sqlite-utils 4.0a1 has several (minor) backwards incompatible changes - 24th November 2025

Monthly briefing

Sponsor me for $10/month and get a curated email digest of the month's most important LLM developments.

Pay me to send you less!

Sponsor & subscribe