$Φ$-Bench: Can Large Language Models Engineer the Infrastructure That Powers Them?

• URL: http://arxiv.org/abs/2609.10226v1
• Date: Wed, 09 Sep 2026 14:23:47 GMT
• Title: $Φ$-Bench: Can Large Language Models Engineer the Infrastructure That Powers Them?
• Abstract summary: $$-Bench is a benchmark for evaluating large language models (LLMs) on engineering the LLM infrastructure stack.<n>$$-Bench is derived from optimization problems studied in frontier research and grounded in real-world code repositories.
• Score: 38.43131935999474
• License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
• Abstract: Large language models (LLMs) have demonstrated remarkable capabilities in reasoning and code generation, raising the prospect that they could assist in developing and optimizing the very infrastructure that powers them. However, existing benchmarks mainly focus on isolated kernels, predefined operators, or pre-specified optimization targets, and therefore fail to evaluate the ability of LLMs to perform open-ended, long-horizon LLM infrastructure engineering. To address this gap, we present $Φ$-Bench, a benchmark for systematically evaluating LLMs on engineering the LLM infrastructure stack. Derived from optimization problems studied in frontier research and grounded in real-world code repositories, $Φ$-Bench provides broad coverage of the LLM infrastructure stack and spans tasks of varying complexity, ranging from localized kernel-level function completion to long-horizon implementation and end-to-end system optimization. Extensive experiments on frontier LLMs reveal their current capabilities and limitations in engineering complex LLM infrastructure, offering insights into the challenges that remain on the path toward autonomous optimization of future AI infrastructure.

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