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LoopArena: Benchmarking Models as Runtime Controllers for Loop Engineering

Research LLM Agents

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Merged summary

TL;DR - LoopArena benchmarks language models acting as runtime Controllers that guide a fixed coding agent through long-running development tasks. Its best full-task strict success rate is only 24.69%, highlighting substantial room to improve agentic loop control.

  • Separates the Controller’s guidance quality from the Worker coding agent’s execution ability.
  • Evaluates control at three levels: execution-validated next-step selection, repeated control over task slices, and complete end-to-end tasks.
  • Controllers reduce estimated inference costs by an average of 64.4% in paired comparisons.
  • The lower-cost Type II evaluation closely matches the main controller ranking, with Spearman’s ρ of 0.9747.

Sources (1)

LoopArena: Benchmarking Models as Runtime Controllers for Loop Engineering

arXiv cs.AI Yi Wang, Haopeng Zhang, Chengxiang Huang, Rui Dai, Kaikui Liu, Piotr Koniusz, Xiangxiang Chu 2026-08-28 arXiv:2608.28281
Public signals Hugging Face upvotes 98
Providers: Hugging Face · Upvotes 98 OpenAlex · N/A Publisher · N/A Semantic Scholar · N/A X · N/A Fetched 2026-09-25 14:25:52.064594 UTC

TL;DR - LoopArena benchmarks language models acting as runtime Controllers that guide a fixed coding agent through long-running development tasks. Its best full-task strict success rate is only 24.69%, highlighting substantial room to improve agentic loop control.

  • Separates the Controller’s guidance quality from the Worker coding agent’s execution ability.
  • Evaluates control at three levels: execution-validated next-step selection, repeated control over task slices, and complete end-to-end tasks.
  • Controllers reduce estimated inference costs by an average of 64.4% in paired comparisons.
  • The lower-cost Type II evaluation closely matches the main controller ranking, with Spearman’s ρ of 0.9747.
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