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Best of N is triggered when you explicitly ask for it in your prompt — for example, best of 3, best of 5, or best of 10. Mux interprets that as a request to launch N sibling sub-agents on the same task. The parent does brief setup, waits for the child runs, then synthesizes the strongest result. Use it when you care more about answer quality than speed. In practice it often improves:
  • plans
  • deep analysis
  • debugging
  • code review
  • anomaly detection in production metrics
  • hard math or proof-style work
It tends to help most when the first plausible answer is often incomplete.

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Good fits

  • Gnarly debugging: multiple plausible root causes, weak logs, or flaky repro steps
  • Deep math: different solution paths may unlock the problem
  • Code review: broader coverage of correctness, tests, design, and edge cases
  • Production metrics: several competing explanations for an anomaly
Start with best of 3 or best of 5. Larger batches cost more and take longer, but can pay off on high-stakes or unusually open-ended problems.