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Research questionHow can GRPO avoid reinforcing guessed correct answers in bounded-answer and search tasks?GRPO derives rollout advantages from within-group reward statistics, so a correct guess can receive the same strong learning signal as a correctly reasoned solution. Repeated updates may therefore favor guess-like behavior rather than reliable reasoning.
AI Agents
Machine Learning
Reasoning
Reinforcement Learning
Latest papersRecent research connected to this question, newest first.Spurious Advantage Hidden in GRPOThe source addresses reinforcement learning with verifiable rewards, including bounded-answer math, open-answer tasks containing bounded cases, and search agents with many paths to the same answer. It reports evidence on math and search-agent benchmarks at different scales, but does not establish behavior beyond those settings.research paper · Sep 3, 2026
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