Weights and Biases

Weights & Biases (W&B) is the AI developer platform used by ML teams to build, train, and deploy AI models and applications with confidence. The platform offers experiment tracking, hyperparameter optimization, dataset versioning, model registry, and LLM observability tools. W&B's product suite includes Models (for traditional ML workflows), Weave (for LLM/agent evaluation and monitoring), and Training (serverless fine-tuning). Customers include OpenAI, Microsoft, Canva, and Toyota. The company is headquartered in San Francisco and serves thousands of organizations worldwide.