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AutoHarness: improving LLM agents by automatically synthesizing a code harness

arXiv – CS AI|Xinghua Lou, Miguel L\'azaro-Gredilla, Antoine Dedieu, Carter Wendelken, Wolfgang Lehrach, Kevin P. Murphy|
🤖AI Summary

Researchers developed AutoHarness, a technique where smaller LLMs like Gemini-2.5-Flash can automatically generate code harnesses to prevent illegal moves in games, outperforming larger models like Gemini-2.5-Pro and GPT-5.2-High. The method eliminates 78% of failures attributed to illegal moves in chess competitions and demonstrates superior performance across 145 different games.

Key Takeaways
  • Smaller LLMs can automatically synthesize code harnesses to prevent illegal actions that larger models frequently make.
  • The technique eliminated all illegal moves across 145 different TextArena games using iterative code refinement.
  • Gemini-2.5-Flash with AutoHarness outperformed larger models like Gemini-2.5-Pro and GPT-5.2-High on game tasks.
  • The method can generate entire policies in code, removing the need for LLM inference during decision-making.
  • This approach offers better performance while being more cost-effective than using larger models.
Mentioned in AI
Models
GeminiGoogle
Read Original →via arXiv – CS AI
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