Weights and Biases

Weights and Biases (W&B) is the leading MLOps platform for machine learning experiment tracking, model visualization, hyperparameter optimization, and production model monitoring. Researchers and ML engineers log experiments, compare runs, and share results through a rich visual interface. ML engineers, data scientists, and research teams use W&B to maintain reproducibility in AI development, collaborate on experiment results, and ensure models perform consistently in production. The Reports feature generates shareable documents that combine live charts, text, and media for communicating research findings. W&B has become the standard tool for professional ML development, used by major AI labs including OpenAI, Stability AI, and research universities. Its Prompts tool (for LLM prompt management) and the Weave evaluation framework extend it into LLM application development.