Weights & Biases, a San Francisco-based MLOps platform founded in 2017, has raised $250 million across multiple funding rounds, reaching a $1.25 billion valuation as of August 2023. Backed by major investors such as Sapphire Ventures, Bond Capital, Coatue, and Insight Partners, the company empowers machine learning teams with visualization, tracking, and collaboration tools. Its most recent Series C round of $50 million led by Daniel Gross and Nat Friedman fuels the expansion of its ML experiment management and LLM-focused tools like W&B Prompts.