Building a multiplayer game world with autonomous Fable-class models
Spawn runs autonomous Fable agents that ship live code changes hourly, spending $3M/month on tokens
“A loop this tight only works if it never stops, so we treat an hour without a ship as a SEV-0, our most severe kind of incident.”
Spawn, a multiplayer voxel game where players prompt the world into existence, is being built almost entirely by a swarm of Fable-powered autonomous agents that read production errors, file their own bug reports, and ship code changes hourly. The company spends over $3 million per month on AI tokens — 30x their payroll — treating any gap in shipping as a critical incident. This is one of the most concrete public examples of fully autonomous, production-grade agentic software development at scale.