This Week in Cognitive Revolution (Apr 27 - May 3, 2026)

This week, This Week in Cognitive Revolution explored the practical mechanics of reinforcement learning fine-tuning with CoreWeave's Kyle Corbitt, who broke down the GRPO framework, rubric design, and environment setup that teams use to steer model behavior at scale. The episode surfaced a central tension in modern AI development: the challenge of defining what we want models to optimize for without accidentally incentivizing them to game the metrics we've created. Corbitt's discussion of reward hacking and its mitigation offers a window into how practitioners are thinking about alignment problems in real production systems.