Author

Toshihiko Yamasaki

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Preprint Aug 2026

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

Task-CoEvolve builds on the observation that tasks on which candidate harnesses disagree are more informative for distinguishing among them than tasks that are consistently solved or failed, and uses variance-weighted sampling based on past outcomes to focus evaluation on tasks near the capability frontier.

Atsuyuki Miyai, Kiyoharu Aizawa, Toshihiko Yamasaki · 5 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. · 1 citation