River AI launches custom losses on River API

River AI@river_ai_incOct 30, 2026

Custom losses are now live on the River API. Write your objective in PyTorch. Our Symbolic Engine compiles and runs it end-to-end across GPUs, handling efficient execution and memory usage. Learn more and see it in action with decision models and score centering:

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Launched Oct 30, 2026View post

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We've raised $1.1B to build AI that is owned and shaped by each of us. Check out the article published by the The New York Times that explains River AI's mission and where we're going next. Our first product is the River API which allows anyone to build custom agents and LLMs https://t.co/kKcDEDuUIz

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