Unverified50% confidenceBenchmarkExact time
In the controlled experiment by De Oliveira et al., PPO won on all tasks except CartPole; GRPO's group weighting mechanism did not yield better performance than a naive batch mean.
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10/14/2026
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UnverifiedThe work of De Oliveira et al. (arXiv:2511.03527) compared critic-free methods with PPO on five classic control tasks.71% similarUnverifiedGRPO's success on reasoning models depends on a specific set of conditions: terminal reward, replayable environment, pretrained priors; when these conditions do not hold, no one takes over the work borne by the removed critic, and degradation appears.62% similarUnverifiedGroup-relative advantage is the core mechanism of methods such as GRPO, which computes each output's relative advantage using the within-group mean reward as a baseline, replacing the value function that is difficult to estimate in traditional RL.61% similarUnverifiedOracle-based diagnostic evaluation finds that GRPO relying solely on final-answer rewards barely improves perception ability, with accuracy gains primarily coming from the language reasoning side.59% similarUnverifiedThere is a Pareto frontier trade-off among reasoning depth, response speed, and cost efficiency, with no single model able to simultaneously achieve optimal performance on all task dimensions.55% similar
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