CoreWeave, Inc., a leading AI cloud platform, announced a definitive agreement to acquire OpenPipe Inc., a Bellevue-based startup specializing in reinforcement learning (RL) for AI agent training, on September 3, 2025. This strategic move strengthens CoreWeave’s position in the AI infrastructure market, building on its recent acquisition of Weights & Biases.
Acquirer: CoreWeave, Inc. (NASDAQ: CRWV), the AI Hyperscaler™.
Target: OpenPipe Inc., a leader in reinforcement learning (RL) for AI agents.
Key Technology: OpenPipe’s Agent Reinforcement Trainer (ART) toolkit and tools for adapting AI models to novel tasks.
Strategic Impact: Enhances CoreWeave’s AI cloud platform with advanced RL capabilities for scalable, reliable AI systems.
Terms: Financial details of the acquisition were not disclosed.
Stock Impact: CoreWeave’s stock (CRWV) closed at $88.93 on September 4, 2025, per the finance card above.
CoreWeave, known for its high-performance AI cloud infrastructure, will integrate OpenPipe’s advanced RL technologies, including the widely used open-source Agent Reinforcement Trainer (ART) toolkit. OpenPipe’s platform enables developers to train AI agents that learn from experience, improving accuracy, performance, and reliability. Brian Venturo, CoreWeave’s Co-founder and Chief Strategy Officer, stated, “By combining OpenPipe’s advanced self-learning tools with CoreWeave’s high-performance AI cloud, we’re expanding our platform to give developers at AI labs and beyond an important advantage in building scalable intelligent systems”.
OpenPipe, founded in 2022 and backed by a $6.7 million seed round in March 2024 from investors like Costanoa Ventures and Y Combinator, democratizes RL by simplifying custom model training for enterprises. Kyle Corbitt, OpenPipe’s Co-founder and CEO, noted, “Our technology helps customers train highly reliable agents, bridging the gap between prototype and production”. The acquisition includes OpenPipe’s team and customer base transitioning to CoreWeave.
This acquisition aligns with CoreWeave’s strategy to deepen vertical integration, following its March 2025 acquisition of Weights & Biases. OpenPipe’s RL expertise enhances CoreWeave’s ability to offer flexible, high-performance solutions for AI labs and enterprises building custom AI agents. Reinforcement learning, which rewards models for correct outputs, is critical for agentic and reasoning tasks, addressing the growing demand for tailored AI solutions. The integration of OpenPipe’s tools with CoreWeave’s GPU-optimized infrastructure positions the company to compete with major players like AWS and Microsoft Azure in the AI cloud market.
While acquisition terms were not disclosed, CoreWeave’s stock performance reflects market confidence, with a market cap of $45.6 billion as of September 4, 2025, despite a recent decline from a high of $187.00 to $88.93 (see finance card above). The acquisition follows CoreWeave’s $11.9 billion deal to provide AI infrastructure to OpenAI and a $2.3 billion debt financing, signaling robust growth plans. OpenPipe’s RL capabilities are expected to drive synergies, particularly for enterprise customers seeking cost-effective, high-performance AI systems.
CoreWeave, founded in 2017, is a leading AI cloud platform providing accelerated computing solutions for enterprises and AI labs. Operating data centers across the US and Europe, it was named a TIME100 most influential company and featured on the Forbes Cloud 100 in 2024.
OpenPipe, established in 2022, is a Y Combinator-backed platform for training reliable AI agents using reinforcement learning. Its ART toolkit is a preferred framework for developers, enabling efficient, low-latency AI model deployment.
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