Asuka-Bench: Benchmarking Code Agents on Underspecified User Intent and Multi-Round Refinement

Abstract:Existing code-generation benchmarks score a single mapping from a complete prompt to a one-shot output. However, real web development is different. Users seldom write a full spec at the start; many requirements only become clear once they look at an intermediate result and react to it. We present Asuka-Bench, a benchmark that pairs underspecified user intent with multi-round refinement, grounded in browser-rendered behavior. Each task is resolved through a closed loop: a Code Agent generates a web project, a UI Agent executes test cases on the deployed site, and a User LLM turns evaluation outcomes into natural-language feedback for the next round. The benchmark comprises 50 web tasks with 784 evaluation criteria and 2402 expected outcomes. We benchmark 8 LLMs across 2 agent frameworks. The results separate models clearly: weighted Task Pass Rate varies by 38 percentage points and models also differ substantially in their ability to repair from feedback. Asuka-Bench is also far from saturated: even the strongest model completes only 52% of projects after three rounds.

Software Engineering (cs.SE); Computation and Language (cs.CL)

arXiv:2606.05920 [cs.SE]

(or arXiv:2606.05920v1 [cs.SE] for this version)

https://doi.org/10.48550/arXiv.2606.05920 Focus to learn more arXiv-issued DOI via DataCite (pending registration)

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