Spawn game world is modified live by Fable-class agents
Original title: Building a multiplayer game world with autonomous Fable-class models
Willison says a phone prompt created a castle and a rideable dragon; agent spend is put above $3 million.
Simon Willison reviews Jacob Sansbury’s account of building Spawn, a massively multiplayer game whose in-game agent, Savi, lets players change the world with prompts. Willison says he briefly created a castle, then a dragon, and flew the dragon around the castle. By Sansbury’s account, as relayed here, Spawn is now developed by a swarm of autonomous Fable-powered agents costing over $3 million. The feed snippet ends mid-sentence.
Unconfirmed: The post is a truncated feed snippet, and the agent cost above $3 million is Jacob Sansbury’s claim as retold by Willison.
- Players prompt the in-game agent Savi to modify the shared game world.
- Willison describes the piece as agentic engineering against frontier models.
- The development-cost figure is Sansbury’s telling, not an audited total.
- AI models
- Fable
From the original article
How I Built the Most AI-Pilled Company in the World Don't be put off by the clickbait headline, this piece by Jacob Sansbury describing how they are building Spawn is a fascinating exploration of the bleeding edge of what's possible with agentic engineering against frontier models. Spawn is a massively multiplayer gaming environment where players can use prompts (to the in-game agent, Savi) to modify the game world.
simonwillison.net
A short excerpt; the article and its images belong to the publisher. Summary, key facts and assessment above are AI-written from the article and can be wrong.