Author

Atsuyuki Miyai

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Preprint Aug 2026

Task-CoEvolve: Efficient Harness Optimization via Adaptive Validation Task Selection

We present a novel approach to efficient LLM harness optimization through adaptive validation task selection. Harness optimization iteratively rewrites the harness code based on validation performance, enabling substantial performance gains without updating the underlying model weights. Existing approaches, however, ev...

Atsuyuki Miyai, Kiyoharu Aizawa, Toshihiko Yamasaki · 2 citations

Preprint Aug 2026

360CityArena: A Realistic Virtual Urban Navigation Benchmark for Embodied Agents

360CityArena provides a necessary and challenging testbed for photorealistic urban-district navigation and spatial reasoning, and evaluation using state-of-the-art LMM-based agents shows that even the strongest model, Gemini 2.5 Flash, performs far below human level.

Kenta Watanabe, Atsuyuki Miyai, Mizuki Takenawa et al. · 0 citations