Simon Willison • 1/19/2026

Scaling long-running autonomous coding

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The article details an experiment by Cursor using hundreds of concurrent autonomous coding agents to build a web browser from scratch. The agents, coordinated by planners and judges, wrote over a million lines of code. It discusses the results, initial skepticism, and how the project compares to predictions about AI's role in complex software development.

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#software development #autonomous agents #ai coding
Scaling long-running autonomous coding

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