Weights & Biases Funding History

Weights & Biases develops tools for tracking machine learning experiments, evaluating models and managing them during development. It is part of CoreWeave.

Company Overview

Weights & Biases

Infrastructure for AI Agents
AI Model Evaluation

Official Website

Weights & Biases Funding Timeline

Oct 15, 2021
Series C
US$135 million
Source · en.wikipedia.org ↗
Feb 1, 2021
Series B
US$45 million
Led by Insight Partners.
Source · en.wikipedia.org ↗

Weights & Biases Founding Team

Lukas Biewald
Co-founder of Weights & Biases.
Status: activeReviewed: 2026-11-05
Chris Van Pelt
Co-founder of Weights & Biases.
Status: activeReviewed: 2026-11-05

Weights & Biases Products

W&B Weave
AI application platform from Weights & Biases providing agent-native tracing, sessions, datasets, evaluations and online signals.
Official Website ↗
Details and Sources
Status: activeReviewed: 2026-10-17