Frontier LLMs drop from 83% to 43% once reasoning has to chain across domains

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[2607.18438] Relay-Bench: Evaluating LLMs on Multi-Domain Reasoning Chains

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arXiv:2607.18438 (cs)

[Submitted on 20 Jul 2026]

Title:Relay-Bench: Evaluating LLMs on Multi-Domain Reasoning Chains

Authors:Liam Swayne<br>View a PDF of the paper titled Relay-Bench: Evaluating LLMs on Multi-Domain Reasoning Chains, by Liam Swayne

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Abstract:Introducing Relay-Bench, an unsaturated, holistic, text-only benchmark that measures LLMs' ability to complete an assortment of tasks from distinct domains in a single prompt. The leading model, GPT-5.5 (xHigh), scores 43.3%. The test set entirely consists of composite problems: groups of single-domain subproblems that are strung together into challenges that require reasoning across multiple domains in combination. Many of these problems then have layers of complexity added through prompt encoding and deliberate context bloat. Domains tested include visual reasoning, coding, math, information extraction (with a focus on web search), problem-solving, general knowledge, and data analysis. No restrictions are imposed outside of the model harness, and models are explicitly encouraged to leverage code-execution, web searches, and all available tools. All problems are composed of two to thirteen subproblems and do not require multi-modal input or output.

Comments:<br>21 pages, 7 figures

Subjects:

Computation and Language (cs.CL); Artificial Intelligence (cs.AI); Machine Learning (cs.LG)

Cite as:<br>arXiv:2607.18438 [cs.CL]

(or<br>arXiv:2607.18438v1 [cs.CL] for this version)

https://doi.org/10.48550/arXiv.2607.18438

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arXiv-issued DOI via DataCite (pending registration)

Submission history<br>From: Liam Swayne [view email]<br>[v1]<br>Mon, 20 Jul 2026 18:46:17 UTC (2,313 KB)

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