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CoreWeave acquires agent-training startup OpenPipe Maxwell Zeff PM PDT · September 3, 2025 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. “

CoreWeave and OpenPipe did not disclose the terms of the deal. In March 2024, the Seattle-based OpenPipe raised a $6.7 million seed round, with backers including Costanoa Ventures, Y Combinator, Google DeepMind’s Logan Kilpatrick, GitHub co-founder Tom Preston-Werner, and co-creator of GitHub Copilot Alex Graveley.

The deal marks CoreWeave’s latest attempt to expand down the stack, following its acquisition of the AI developer platform, Weights & Biases, in March. OpenPipe develops a popular open

A growing number of AI labs and startups are building out enterprise products around reinforcement learning, which involves rewarding AI models for correct responses. Reinforcement learning has proven a strong way to improve an AI model’s performance on a specific task; the idea with these enterprise products is to train AI agents specifically for a company’s needs.

This kind of customer-specific training requires a lot of computing re

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