Recent progress in reasoning models has substantially advanced long-horizon mathematical and scientific problem solving, with several systems now reaching gold-medal-level performance on International Mathematical Olympiad (IMO) and International Physics Olympiad (IPhO) problems. In this paper, we introduce a simple and unified recipe for converting a post-trained reasoning backbone into a rigorous olympiad-level solver. The recipe first uses a reverse-perplexity curriculum for SFT to instill rigorous proof-search and self-checking behaviors, then scales these behaviors through a two-stage RL pipeline that progresses from RL with verifiable rewards to more delicate proof-level RL, and finally boosts solving performance with test-time scaling. Applying this recipe, we train a 30B-A3B backbone with SFT on around 340K sub-8K-token trajectories followed by 200 RL steps. The resulting model, SU-01, supports stable reasoning on difficult problems with trajectories exceeding 100K tokens, while achieving gold-medal-level performance on mathematical and physical olympiad competitions, including IMO 2025/USAMO 2026 and IPhO 2024/2025. It also demonstrates strong generalization of scientific reasoning to domains beyond mathematics and physics.
@article{arxiv.2605.13301,
title = {Achieving Gold-Medal-Level Olympiad Reasoning via Simple and Unified Scaling},
author = {Yafu Li and Runzhe Zhan and Haoran Zhang and Shunkai Zhang and Yizhuo Li and Zhilin Wang and Jiacheng Chen and Futing Wang and Xuyang Hu and Yuchen Fan and Bangjie Xu and Yucheng Su and Xinmiao Han and Chenxi Li and Haodi Lei and Yufeng Zhao and Zejin Lin and Qianjia Cheng and Tong Zhu and Xiaoye Qu and Ganqu Cui and Peng Ye and Yun Luo and Zhouchen Lin and Yu Qiao and Bowen Zhou and Ning Ding and Yu Cheng},
journal= {arXiv preprint arXiv:2605.13301},
year = {2026}
}