# Anthropic Uses Claude to Solve Nine-Loop Physics Calculation

Claude ran largely unsupervised for days in Claude Science to calculate a nine-loop scattering amplitude at a total cost of a few thousand dollars.

- The calculation broke the previous eight-loop record in the planar N=4 super-Yang-Mills model set by SLAC's Lance Dixon and collaborators.
- Lance Dixon independently verified Claude's nine-loop result.
- The calculation was completed from a single prompt based on a challenge from physicist @4gravitons.

## Why it matters

Theoretical physicists can use AI agents to execute multi-day, complex calculations that previously exceeded human computational limits at academic budgets.

## Sources

- [Anthropic: Anthropic Uses Claude to Solve Nine-Loop Physics Calculation](https://x.com/AnthropicAI/status/2103541577083719888)

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Summarized by dstilled on 2026-09-25. https://dstilled.ai/story/4f87b178-bcde-4ff4-8727-d7d33b877b78