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TheoPhysEval: Assessing AI agents at autonomous theoretical physics solving

A new arXiv paper, TheoPhysEval, reports that the best-performing off-the-shelf AI agent, GPT-6-Astra harnessed in Codex, solved 98% of 50 unpublished research-level theoretical physics problems autonomously at an average cost under USD 3 per problem. The benchmark problems, submitted 9 Oct 2026, would each take a world expert roughly a day or less, and agents showed only small accuracy changes when denied web search and background papers, suggesting significant memorization of the literature. The authors note the results indicate state-of-the-art agents can perform concrete theoretical physics calculations but still lack agent-led breakthroughs in the field.

read2 min views1 publishedOct 15, 2026
TheoPhysEval: Assessing AI agents at autonomous theoretical physics solving
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  [Submitted on 9 Oct 2026]


[View PDF](https://arxiv.org/pdf/2610.16733)

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Abstract:We present a suite of 50 unpublished research-level theoretical physics problems with verifiable answers. Without AI assistance, a typical problem in our collection could be solved by a world expert in about a day or less but would take considerably longer for experts in adjacent specialties. We test the ability of off-the-shelf AI agents to tackle these problems autonomously, without human hints. When given access to tools available in a realistic setting, including the ability to search the literature and write scripts for numerical and symbolic work, the best-performing agent, GPT-6-Astra harnessed in Codex, obtains the final answers with a near-perfect accuracy of 98% at an average cost under USD 3 per problem. On average, agents show only small changes in accuracy when denied web search and access to background research papers, suggesting significant memorization of the literature. These results suggest that state-of-the-art agents can accurately perform concrete calculations required across theoretical physics research. We comment on the broader implications of these findings and discuss possible explanations for the current lack of agent-led breakthroughs in theoretical physics despite their outstanding problem-solving abilities.

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