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Reason is the best coding agent, in the cloud or locally. Give it a task and it writes code, runs tests and opens a pull request. Use Reason from the Mac app, terminal, web or Slack, with your choice of models and connected subscriptions. Start free on your own computer. Our published GPT-6 Astra evaluation scores 65.1 on the Coding Agent Index vs Codex’s 62.5, at 22% lower cost per solved task.