Crossing the Reward Bridge: Expanding RL with Verifiable Rewards Across Diverse Domains
This work addresses the problem of applying RL to noisy, unstructured domains for AI practitioners, representing an incremental but substantial improvement in RLVR's scalability.
The paper tackles the challenge of extending reinforcement learning with verifiable rewards (RLVR) to diverse real-world domains without structured reference answers, achieving significant performance gains over state-of-the-art models like Qwen2.5-72B and DeepSeek-R1-Distill-Qwen-32B across domains such as medicine and economics.
Reinforcement learning with verifiable rewards (RLVR) has demonstrated significant success in enhancing mathematical reasoning and coding performance of large language models (LLMs), especially when structured reference answers are accessible for verification. However, its extension to broader, less structured domains remains unexplored. In this work, we investigate the effectiveness and scalability of RLVR across diverse real-world domains including medicine, chemistry, psychology, economics, and education, where structured reference answers are typically unavailable. We reveal that binary verification judgments on broad-domain tasks exhibit high consistency across various LLMs provided expert-written reference answers exist. Motivated by this finding, we utilize a generative scoring technique that yields soft, model-based reward signals to overcome limitations posed by binary verifications, especially in free-form, unstructured answer scenarios. We further demonstrate the feasibility of training cross-domain generative reward models using relatively small (7B) LLMs without the need for extensive domain-specific annotation. Through comprehensive experiments, our RLVR framework establishes clear performance gains, significantly outperforming state-of-the-art open-source aligned models such as Qwen2.5-72B and DeepSeek-R1-Distill-Qwen-32B across domains in free-form settings. Our approach notably enhances the robustness, flexibility, and scalability of RLVR, representing a substantial step towards practical reinforcement learning applications in complex, noisy-label scenarios.