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CoreWeave acquires agent-training startup OpenPipe

CoreWeave, which provides cloud servers to large companies training AI models, has struck an agreement to acquire OpenPipe, a 2-year-old Y Combinator-backed startup that helps enterprises develop customized AI agents with reinforcement learning, the companies announced on Wednesday. “Reinforcement learning is emerging as a pivotal force to strengthen model performance on agentic and reasoning tasks,” said Brian Venturo, Co-founder of CoreWeave, in a statement to TechCrunch. “By combining OpenPi

Reinforcement learning, explained with a minimum of math and jargon

It’s Agent Week at Understanding AI! This week I’m going to publish a series of articles explaining the most important AI trend of 2025: agents! Today is a deep dive into reinforcement learning, the training technique that made agentic models like Claude 3.5 Sonnet and o3 possible. Today’s article is available for free, but some articles in the series—including tomorrow’s article on MCP and tool use—will be for paying subscribers only. I’m offering a 20 percent discount on annual subscriptions