Building a multiplayer game world with autonomous Fable-class models

Summary

Jacob Sansbury describes how Spawn, a massively multiplayer game where players use prompts to Savi, an in-game AI, to modify the world, is developed autonomously by Fable-powered agents that change live code and ship to production hourly. He reports spending over $3 million per month on tokens, and says a security review applied with GPT-6 Astra disabled every feature until fixes were made.

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