Spawn multiplayer game world built by autonomous Fable agents costing $3M+ monthly in tokens
Jacob Sansbury describes building Spawn, a massively multiplayer game world where players use prompts to modify the environment, developed autonomously by a swarm of Fable-powered agents. The agents cost over $3 million in tokens per month, about 30x payroll, and directly change live code, shipping to production hourly while reading every error, bug report, and metric themselves.
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Simon Willison
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. I fired it up on my phone for a few minutes and was able to prompt a castle into existence, then a dragon, then ride the dragon to fly around that castle. By Jacob's telling, Spawn is now being developed autonomously by a swarm of Fable-powered agents costing over $3 million in tokens per month ("we spend 30x payroll on AI tokens"). Our agents change the live code directly and ship to production hourly, so they read every error, bug report and metric themselves. About 60% of our work starts from a production error, a Savi bug report (Savi is the AI you build games with in S
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