Build better models faster.
Weights & Biases (W&B) is an AI developer platform founded in 2017 by Lukas Biewald, Chris Van Pelt, and Shawn Lewis. It provides tools for experiment tracking, model evaluation, dataset versioning, and LLM observability used by millions of ML practitioners at companies including OpenAI, NVIDIA, and Cohere. W&B was acquired by CoreWeave in May 2025.
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