Sebastian Raschka • 4/19/2025

The State of Reinforcement Learning for LLM Reasoning

This article explores the latest developments in using reinforcement learning (RL) to improve reasoning in LLMs. It discusses why new flagship models like GPT-4.5 received muted reactions, contrasting them with reasoning-focused models from competitors and OpenAI's o3. The piece provides a technical deep dive into RL methods, algorithms like PPO and GRPO, reward modeling, and lessons from recent research papers on training reasoning models.

0 comments

#Reinforcement Learning #Model Training #Ppo