Simon Willison recounts how Spawn uses a Fable model agent swarm to autonomously develop games
Simon Willison recommends Jacob Sansbury's article, which describes how the multiplayer game environment Spawn is autonomously developed by a Fable-driven agent swarm, with monthly token costs exceeding $3 million. The article states that agents directly modify production code and release hourly; about 60% of the work originates from production errors, bug reports submitted by Savi, or feature requests, and failure to ship within an hour is treated as the highest-severity incident. Jacob says that only Fable 5 and 5.1 make this degree of autonomy possible, that Opus 5.5 struggles to handle it, and that when GPT-6 Astra was used to handle security review fixes, it shut down all insecure features, bringing everything to a halt.
Simon Willison recommends Jacob Sansbury's article, which describes how the multiplayer game environment Spawn is autonomously developed by a Fable-driven agent swarm, with monthly token costs exceeding $3 million. The article states that agents directly modify production code and release hourly; about 60% of the work originates from production errors, bug reports submitted by Savi, or feature requests, and failure to ship within an hour is treated as the highest-severity incident. Jacob says th
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