AReaL

Build and run agents you can see, understand and trust.

The absolute trainer to light up AI agents.

Agent Reinforcement Trainer: train multi-step agents for real-world tasks using GRPO. Give your agents on-the-job training. Reinforcement learning for Qwen3.5, GPT-OSS, Llama, and more!

A Next-Generation Training Engine Built for Ultra-Large MoE Models