Seed1.5-Thinking: Advancing Superb Reasoning Models with Reinforcement Learning
Computation and Language
2025-04-30 v3
Abstract
We introduce Seed1.5-Thinking, capable of reasoning through thinking before responding, resulting in improved performance on a wide range of benchmarks. Seed1.5-Thinking achieves 86.7 on AIME 2024, 55.0 on Codeforces and 77.3 on GPQA, demonstrating excellent reasoning abilities in STEM and coding. Beyond reasoning tasks, the method demonstrates notable generalization across diverse domains. For instance, it surpasses DeepSeek R1 by 8% in win rate on non-reasoning tasks, indicating its broader applicability. Compared to other state-of-the-art reasoning models, Seed1.5-Thinking is a Mixture-of-Experts (MoE) model with a relatively small size, featuring 20B activated and 200B total parameters. As part of our effort to assess generalized reasoning, we develop two internal benchmarks, BeyondAIME and Codeforces, both of which will be publicly released to support future research. Model trial link: https://www.volcengine.com/experience/ark.
Keywords
Cite
@article{arxiv.2504.13914,
title = {Seed1.5-Thinking: Advancing Superb Reasoning Models with Reinforcement Learning},
author = {ByteDance Seed and : and Jiaze Chen and Tiantian Fan and Xin Liu and Lingjun Liu and Zhiqi Lin and Mingxuan Wang and Chengyi Wang and Xiangpeng Wei and Wenyuan Xu and Yufeng Yuan and Yu Yue and Lin Yan and Qiying Yu and Xiaochen Zuo and Chi Zhang and Ruofei Zhu and Zhecheng An and Zhihao Bai and Yu Bao and Xingyan Bin and Jiangjie Chen and Feng Chen and Hongmin Chen and Riwei Chen and Liangqiang Chen and Zixin Chen and Jinsong Chen and Siyan Chen and Kaiyuan Chen and Zhi Chen and Jin Chen and Jiecao Chen and Jinxin Chi and Weinan Dai and Ning Dai and Jiahui Dai and Shihan Dou and Yantao Du and Zhengyin Du and Jianhui Duan and Chen Dun and Ting-Han Fan and Jiazhan Feng and Junda Feng and Ziyuan Feng and Yuwei Fu and Wenqi Fu and Hanjie Fu and Hao Ge and Hongyi Guo and Mingji Han and Li Han and Wenhao Hao and Xintong Hao and Qianyu He and Jerry He and Feng He and Wen Heng and Zehua Hong and Qi Hou and Liang Hu and Shengding Hu and Nan Hu and Kai Hua and Qi Huang and Ziyue Huang and Hongzhi Huang and Zihao Huang and Ting Huang and Wenhao Huang and Wei Jia and Bin Jia and Xiaoying Jia and Yuhua Jiang and Haobin Jiang and Ziheng Jiang and Kaihua Jiang and Chengquan Jiang and Jianpeng Jiao and Xiaoran Jin and Xing Jin and Xunhao Lai and Zheng Li and Xiang Li and Liyi Li and Hongkai Li and Zheng Li and Shengxian Wan and Ya Wang and Yunshui Li and Chenggang Li and Niuniu Li and Siyu Li and Xi Li and Xiao Li and Aoyan Li and Yuntao Li and Nianning Liang and Xinnian Liang and Haibin Lin and Weijian Lin and Ye Lin and Zhicheng Liu and Guanlin Liu and Guanlin Liu and Chenxiao Liu and Yan Liu and Gaohong Liu and Juncai Liu and Chundian Liu and Deyi Liu and Kaibo Liu and Siyao Liu and Qi Liu and Yongfei Liu and Kang Liu and Gan Liu and Boyi Liu and Rui Long and Weiqiang Lou and Chenwei Lou and Xiang Luo and Yao Luo and Caiping Lv and Heyang Lv and Bole Ma and Qianli Ma and Hongzhi Ma and Yiyuan Ma and Jin Ma and Wenchang Ma and Tingting Ma and Chen Mao and Qiyang Min and Zhe Nan and Guanghan Ning and Jinxiang Ou and Haojie Pan and Renming Pang and Yanghua Peng and Tao Peng and Lihua Qian and Lihua Qian and Mu Qiao and Meng Qu and Cheng Ren and Hongbin Ren and Yong Shan and Wei Shen and Ke Shen and Kai Shen and Guangming Sheng and Jinlong Shi and Wenlei Shi and Guang Shi and Shuai Shuai Cao and Yuxin Song and Zuquan Song and Jing Su and Yifan Sun and Tao Sun and Zewei Sun and Borui Wan and Zihan Wang and Xiaohui Wang and Xi Wang and Shuguang Wang and Jun Wang and Qinlong Wang and Chenyuan Wang and Shuai Wang and Zihan Wang and Changbao Wang and Jiaqiang Wang and Shihang Wang and Xuwu Wang and Zaiyuan Wang and Yuxuan Wang and Wenqi Wang and Taiqing Wang and Chengzhi Wei and Houmin Wei and Ziyun Wei and Shufa Wei and Zheng Wu and Yonghui Wu and Yangjun Wu and Bohong Wu and Shuang Wu and Jingqiao Wu and Ning Wu and Shuangzhi Wu and Jianmin Wu and Chenguang Xi and Fan Xia and Yuqiao Xian and Liang Xiang and Boren Xiang and Bowen Xiao and Zhen Xiao and Xia Xiao and Yongsheng Xiao and Chao Xin and Shulin Xin and Yuwen Xiong and Jingjing Xu and Ziwen Xu and Chenyin Xu and Jiayi Xu and Yifan Xu and Wei Xu and Yufei Xu and Shikun Xu and Shipeng Yan and Shen Yan and Qingping Yang and Xi Yang and Tianhao Yang and Yuehang Yang and Yuan Yang and Ximing Yang and Zeyu Yang and Guang Yang and Yifan Yang and Xuesong Yao and Bairen Yi and Fan Yin and Jianian Yin and Ziqiang Ying and Xiangyu Yu and Hongli Yu and Song Yu and Menghan Yu and Huan Yu and Siyu Yuan and Jun Yuan and Yutao Zeng and Tianyang Zhan and Zheng Zhang and Yun Zhang and Mofan Zhang and Wang Zhang and Ru Zhang and Zhi Zhang and Tianqi Zhang and Xinyi Zhang and Zhexi Zhang and Sijun Zhang and Wenqiang Zhang and Xiangxiang Zhang and Yongtao Zhang and Yuyu Zhang and Ge Zhang and He Zhang and Yue Zhang and Renjie Zheng and Ningxin Zheng and Zhuolin Zheng and Yaowei Zheng and Chen Zheng and Xiaoyun Zhi and Wanjun Zhong and Cheng Zhong and Zheng Zhong and Baoquan Zhong and Xun Zhou and Na Zhou and Huan Zhou and Hang Zhu and Defa Zhu and Wenjia Zhu and Lei Zuo},
journal= {arXiv preprint arXiv:2504.13914},
year = {2025}
}