The State of Reinforcement Learning for LLM Reasoning

A lot has happened this month, especially with the releases of new flagship models like GPT-4.5 and Llama 4. But you might have noticed that reactions to these releases were relatively muted. Why? One reason could be that GPT-4.5 and Llama 4 remain conventional models, which means they were trained without explicit reinforcement learning for reasoning.Meanwhile, competitors such as xAI and Anthropic have added more reasoning capabilities and features into their models. For instance, both the xAI...