Length-Unbiased Sequence Policy Optimization: Revealing and Controlling Response Length Variation in RLVR

Benchmark Model Rank Results
mathematical-reasoning-on-aime24Qwen3-30B-A3B-Instruct (LUSPO)#21Acc: 83.6
multimodal-reasoning-on-mathvistaQwen2.5-VL-7B-Instruct (LUSPO)#49Accuracy: 74.4
multimodal-reasoning-on-mathvisionQwen2.5-VL-7B-Instruct (LUSPO)#52Accuracy: 28.0
mathematical-reasoning-on-math-500Qwen2.5-7B-Base (LUSPO)#97Accuracy: 78.4