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
- Valuation
- $1.3BAug 2023
- Last Round
- $50.0M Growth EquityAug 2023
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.
Sign up to view funding chart
Create a free account to see funding visualizations and detailed round data.
Create Free Account