Observed arrival · 2026-11-03
Three Claude models, one survival world
An independent experiment puts Claude Opus, Sonnet, and Haiku in a survival world and asks them to build from camp to city.
- For
- Readers of AI behavior experiments and autonomous-agent simulations
- Worth noticing
- The log says the experiment moved off real Minecraft onto its own engine on Oct. 31.
Field notes
The page describes a survival simulation with day-and-night cycles, nighttime monsters, ores, animals, villages for trade, and treasure. Each model gets one life and can plan, divide work, and keep notes; the operators say they fix bugs in the game and agents without steering choices. The visible progress ladder runs from camp through city, while the current tracker says “Nothing built yet.” Log entries include a move to a custom engine and fixes for queued actions and getting stuck in dirt and leaves.
Observed signals
Read the marks
Editorial observations of this landing page, not a rating.
One card from the complete issue