language, license, library_name, base_model, tags, pipeline_tag

language	license	library_name	base_model	tags	pipeline_tag
en	apache-2.0	transformers	Qwen/Qwen3-4B	agent tool-use reinforcement-learning GRPO math code reasoning	text-generation

SOD-GRPO_teacher-4B

About

SOD-GRPO_teacher-4B is a 4B agentic reasoning model trained with GRPO (Group Relative Policy Optimization), serving as the teacher model in the SOD distillation framework.

This model is used to distill smaller student models (SOD-0.6B and SOD-1.7B) via the SOD method, which introduces adaptive step-level weighting to handle cascading error propagation in tool-integrated reasoning.

Model Information

Attribute	Value
Base Model	Qwen3-4B
Training Pipeline	Cold-Start SFT → GRPO
Parameters	4B

Related Models

Model	Description
SOD-0.6B	SOD-distilled 0.6B student
SOD-1.7B	SOD-distilled 1.7B student
SOD-GRPO_teacher-4B	GRPO-trained 4B teacher model (this model)

Performance

We report average@32 over 5 runs on challenging math, science, and code benchmarks.

Method	AIME 2024	AIME 2025	GPQA-Diamond	LiveCodeBench-v6	Average
GRPO (This Model)	67.60	60.42	55.19	63.13	61.59

Distilled Students

Model	AIME 2024	AIME 2025	GPQA-Diamond	LiveCodeBench-v6	Average
SOD-0.6B	20.84	26.13	22.19	27.72	24.22
SOD-1.7B	50.83	41.72	38.72	40.63	42.98

Acknowledgement

We sincerely thank the authors of DemyAgent-4B and the paper "Demystifying Reinforcement Learning in Agentic Reasoning" (arXiv:2510.11701) for their contribution.

Citation

@article{zhong2026sod,
  title={SOD: Step-wise On-policy Distillation for Small Language Model Agents},
  author={Zhong, Qiyong and Zheng, Mao and Song, Mingyang and Lin, Xin and Sun, Jie and Jiang, Houcheng and Wang, Xiang and Fang, Junfeng},
  journal={arXiv preprint arXiv:2605.07725},
  year={2026}
}