Weights & Biases
Build better models faster.
- Headquarters
- San Francisco, California
- Employees
- 201–500
- Founded
- 2017
- Business Model
- B2B
- Website
- wandb.ai
- Total Funding
- $150.0M
- Last Round
- $50.0M Growth EquityAug 2023
- Rounds
- 2
About
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.
Tech & App Stack
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Aug 2023
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