Test of 221 Chats Finds Claude Says '47' as Random Number 92% of the Time

Randal Olson tested three Claude models across 221 fresh sessions asking for a random number between 1 and 100; the answers clustered heavily on 42 and 47, with 47 chosen 92% of the time, revealing systematic bias in LLM randomness.

2026-10-19 ~ 2026-10-19 · 2 related posts

• 221 fresh chats: Claude Sonnet 5.5 says "47" for 92% of random number requests — randal_olson · 2026-10-19
• Source revealed: Claude models' random number picks cluster on 42 and 47 — randal_olson · 2026-10-19