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arXiv · 2605.24110

EvoCode-Bench: Evaluating Coding Agents in Multi-Turn Iterative Interactions

Haiyang Shen·Xuanzhong Chen·Wendong Xu·Yun Ma·Liang Chen·Kuan Li
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Abstract

Coding agents are increasingly used as iterative development partners, but most benchmarks still evaluate one specification followed by one final assessment. This leaves out a basic question: can an agent keep its own codebase working as requirements change? We introduce EvoCode-Bench, a benchmark of 26 stateful coding tasks and 227 evaluated rounds. Each task preserves the agent's workspace for 5-15 rounds, states requirements through observable behavior, and uses cumulative executable tests to check new requirements and still-active prior ones. We evaluate 13 coding agents with two metrics: MT@4, a four-attempt fail-stop multi-round score, and SR, a single-round score from a reference-completed prior state. For most agents, SR exceeds MT@4 by 22-40 points. The gap also changes rankings: the highest-SR agent (78.9) ranks only third in persistent execution (44.0 MT@4). Even the strongest agents achieve only about 50% success on multi-turn metrics, and aggregate pass rate drops below half of round-1 performance by round 5. Failure analysis shows tier-dependent behavior: weaker agents fail early, while stronger agents survive long enough to expose specification-tracking and regression failures. We release the benchmark data and Harbor multi-turn infrastructure.

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Haiyang Shen, Xuanzhong Chen, Wendong Xu, Yun Ma, Liang Chen, Kuan Li. 2026-05-22. EvoCode-Bench: Evaluating Coding Agents in Multi-Turn Iterative Interactions. https://arxiv.org/abs/2605.24110

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