AReaL: Ant Reasoning Reinforcement Learning for LLMs

AReaL (Ant Reasoning RL) is a fully open-sourced, scalable, and efficient reinforcement learning training system for large language models developed at the RL Lab, Ant Research, built upon the open-source project RealHF. We fully commit to open-source by releasing training details, data, and infra required to reproduce all the models with the desired performances. AReaL aims to help everyone build their own AI agents easily and affordably. Our team loves milk tea as it is delicious, customizable, and affordable. We hope you all enjoy our project just like how you enjoy A-ReaL-milk-tea.🧋

AReaL Highlights

• 🛠️ Open & Reproducible: We will continuously release all code, datasets, and training recipes for RL training LLMs .
• 🚀 Scalability: AReaL can seamlessly adapt to different computational resource settings, ranging from 1 single node to 1K GPUs.
• 🔪 Cutting-Edge Performances: AReaL can produce models with cutting-edge reasoning capabilities. We are actively working on other domains, such as coding and agent, as well.

News

[2025/04/27] 🔥 We've built a documentation website using the amazing DeepWiki tool. Check the link to know and ask about AReaL!

[2025/03/31] (v0.2, Boba) Our milestone release Boba! Please call it A-ReaL-Boba! This release includes much accelerated training with SGLang support and SOTA 7B and 32B models on math reasoning.

[2025/02/24] (v0.1) Our initial release includes reproducible results for 1.5B and 7B LRMs. Check our v0.1 technical blog.

AReaL-boba Milestones and Highlights

In our boba release, we highlight the 3 most important milestones:

• Full SGLang support and a collection of efficiency improvements
• A SOTA 7B math reasoning model AReaL-boba-RL-7B and the corresponing training data AReaL-boba-106k.
• A particularly competitive 32B model AReaL-boba-SFT-32B that can be trained with extremely low cost. (Training Data: AReaL-boba-SFT-200)

For the complete training and model details, please check our v0.2 technical blog.

SGLang support with 1.5x speedup on 7B Training

Thanks to a series of system-level optimizations, AReaL v0.2 improves its end-to-end training performance by up to 73%.

In the following table, we show the convergence time under different resource settings:

Model Size	1.5B	1.5B	1.5B	7B	7B	32B (SFT)
#GPU	8	32	128	32	128	64
Step	250	250	250	400	400	300
Time (h)	~240	~69	~27	~252	~90	~3.5

SOTA 7B model using RL in math reasoning

Model	AIME 2024	AIME 2025	GPQA-Diamond
O1-Preview	56.7	-
R1-Distill-Qwen-7B	55.0	39.7	47.1
Light-R1-7B-DS	56.7	44.9	40.9
AReaL-boba-RL-7B 🤗	61.9	48.3	47.6

We use R1-Distill-Qwen-7B as our base model. After RL training, the pass@1 scores on AIME 2024 and AIME 2025 improve by 6.9 and 8.6 points, respectively, achieving SOTA performance among 7B models in mathematical reasoning. We have released the training data at AReaL-boba-106k.

Although our dataset primarily consists of math and logic problems, we observed that RL training led to measurable improvements on the challenging STEM benchmark GPQA. We plan to open-source more datasets in the future, including code, STEM, and other domains. All the reported numbers are re-evaluated using our evaluation code with more details in our blog.

Approaching QwQ-32B performances using only 200 data samples

Model	AIME 2024
R1-Distill-Qwen-32B	72.6
QwQ-32B	78.9
AReaL-boba-SFT-32B 🤗	78.8

Building upon R1-Distill-Qwen-32B, we replicate QwQ-32B's inference performance on AIME 2024 using just 200 data points via Supervised Fine-Tuning (SFT). We have released the training data at AReaL-boba-SFT-200.

Getting Started

Quick Start

# Train the distilled 7B model
python3 -m realhf.apps.quickstart ppo-math \
  --config examples/configs/7B-distill/ppo-7B-distill-gpus-128.yaml

# Evaluate the 7B model
python evaluation/eval_and_aggregate.py \
  --model_path ${MODEL_PATH} \
  --output_path ${OUTPUT_PATH} \
  --data_names aime24,aime25 \
  --prompt_type AReaL-boba \
  --output_path outputs --temperature 1.0

Resources

• Tutorial
• Tutorial (中文)

Future Plan

AReaL is under active development. We will have major releases in a weekly manner. We also highly appreciate efforts from the community as well. Here we highlight our future research and development plan.

System Development

• Support for SGLang.
• RL training with coding problems.
• Asynchronous generation and RL training.
• Optimizations for distributed training: expert parallel and zero-bubble pipelining.
• RL for vision-language models (VLM).
• Function calling and agent capabilities.

Algorithm Development

• RL training receipes for 1.5B and 7B models.
• A complete RL training receipe for 32B models.
• Sample-efficient multi-task RL algorithms.
• Agentic capabilities with end-to-end RL.
• Stable RL training for larger MOE models.

Acknowledgement

We would like to remark that major contributors are from RL Lab at Ant Research and Institute for Interdisciplinary Information Sciences, Tsinghua University.

Our team has also received invaluable assistance from the Super Computing Technology (SCT) team at Ant Group, particularly in large-scale cluster operations and maintenance.

We also appreciate all the pioneer works from the community, particularly the ReaLHF project from OpenPsi Inc. and many other projects, including but not limited to, DeepScaleR, Open-Reasoner-Zero, OpenRLHF, verl, SGLang, QwQ, Light-R1, and DAPO.

Citation

@inproceedings{mei2025real,
  author       = {Mei, Zhiyu and Fu, Wei and Li, Kaiwei and Wang, Guangju and Zhang, Huanchen and Wu, Yi},
  title        = {ReaL: Efficient RLHF Training of Large Language Models with Parameter Reallocation},
  booktitle    = {Proceedings of the Eighth Conference on Machine Learning and Systems,
                  MLSys 2025, Santa Clara, CA, USA, May 12-15, 2025},
  publisher    = {mlsys.org},
  year         = {2025},
}

@misc{areal2025,
  author = {RL Lab, Ant Research},
  title = {AReaL: Ant Reasoning RL},
  year = {2025},
  publisher = {GitHub},
  journal = {GitHub repository},
  howpublished = {\url{https://github.com/inclusionAI/AReaL}},
}