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Weights & Biases logo — Experiment tracking and hyperparameter sweeps for AI researc...

Weights & Biases

Experiment tracking and hyperparameter sweeps for AI researchers and engineers, by CoreWeave. Part of CoreWeave Forge.

Founded 2017 United States San Francisco, United States 287 employees Acquired Total: $1.95B AI, Data Analytics +2

General Information

Company Name Weights & Biases
Founded Year 2017
Location United States San Francisco, United States
Employees 287
Industries AI, Data Analytics, Developer Tools +1
Funding Stage Acquired
Business Model B2B, SaaS, Platform
Revenue Model Subscription, Usage Based, Freemium
Hiring 12 roles posted in the month to 1 Nov 2026
Offices as of Oct 2026
San Francisco, United States
Social

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Recorded by Bounce Watch from public sources. Every entry below carries the date we observed it, and when we have not looked recently the page says so rather than leaving silence to imply nothing happened.

Feature Release Nov 02, 2026

Weights & Biases launched synced zoom and pan for images in Weights & Biases Models.

Actively Hiring Oct 28, 2026

Hiring for 12 positions in the last 30 days.

Major Customer Win Oct 16, 2026

Weights & Biases has secured Reflection as a customer, with Reflection using Weights & Biases Models in CoreWeave Forge during the training of its new Beam model.

Pricing Changed Oct 07, 2026

Weights & Biases removed plans priced at $10/mo and $25/mo, added **Free** at $0/mo, **Pro** at $60/month, and **Enterprise** plans, effectively raising the price for professionals from $25/mo to $…

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About Weights & Biases

Weights & Biases, founded in 2017, is a leader in the rapidly evolving AI and Data Analytics sectors. Positioned as "The AI developer platform," the company offers a comprehensive suite of tools designed to expedite AI model development, including fine-tuning LLMs and building GenAI applications with robust MLOps solutions.

The platform's components, such as W&B Models and W&B Weave, cater to both foundation model builders and software developers, making it an essential tool for enterprises aiming to transition models into production efficiently. With major players like OpenAI, Meta, and NVIDIA among its clientele, Weights & Biases boasts a significant market trust and adoption, underpinning its prowess in AI and Machine Learning innovation.

Headquartered in the United States, the company made headlines with a $1.70B acquisition investment from CoreWeave in March 2025. Such substantial backing signals confidence in their market trajectory and potential scalability.

Business keywords: MLOps, LLMOps, GenAI Applications, Model Performance Visualization, Experiment Tracking, AI Governance, Model Monitoring, Inference, Model Comparison, Data Quality, AI Observability, Prompt Engineering, Hyperparameter Tuning, Reproducibility, Dataset Versioning

Pricing

as listed on Oct 31, 2026

Free plan · $60/month · Enterprise on request

  • Free: free
  • Pro: $60/month
  • Enterprise: contact sales
Weights & Biases's pricing page

Funding Rounds & Investors (7)

View All
Funding Stage Amount Investors Lead Investors Date
Acquisition $1.70B 1
CoreWeave
01 Mar 2025
Late VC $50.00M 8
Bloomberg Beta Felicis Ventures Insight Partners
Bloomberg Beta, Felicis Ventures +6
01 Aug 2023
Late VC Undisclosed 1
Nvidia
Nvidia
01 May 2022
Series C $135.00M 4
Felicis Ventures Insight Partners
Felicis Ventures, Insight Partners +2
01 Oct 2021
Series B $45.00M 4
Bloomberg Beta Insight Partners Trinity Ventures
Bloomberg Beta, Insight Partners +2
01 Feb 2021
Series B $15.00M 3
Coatue Management, Nat Friedman +1
01 May 2019
Series A $5.00M 2
Bloomberg Beta Trinity Ventures
Bloomberg Beta, Trinity Ventures
01 Jun 2018

Latest News

View All
Weights & Biases is now part of CoreWeave — CoreWeave
Weights & Biases is now part of CoreWeave
CoreWeave Sep 30, 2026
How We Built an Agent That Improves Itself — Zubin Aysola, Weights & Biases｜AI Engineer — Finance.biggo.com
How We Built an Agent That Improves Itself — Zubin Aysola, Weights & Biases｜AI Engineer
Finance.biggo.com Sep 26, 2026
Tim Sweeney: Agent Eval Suites Are the New CI — How Weights & Biases Gates AI Models on a 73% vs 72%... — Finance.biggo.com
Tim Sweeney: Agent Eval Suites Are the New CI — How Weights & Biases Gates AI Models on a 73% vs 72% Score
Finance.biggo.com Sep 26, 2026
An AI Research Agent That Runs Your Experiments — Tim Sweeney, Weights & Biases｜AI Engineer — Finance.biggo.com
An AI Research Agent That Runs Your Experiments — Tim Sweeney, Weights & Biases｜AI Engineer
Finance.biggo.com Sep 23, 2026
CoreWeave CEO says Core Scientific 'not a need to have' as shareholder opposition to deal rises — Cnbc
CoreWeave CEO says Core Scientific 'not a need to have' as shareholder opposition to deal rises
Cnbc Oct 21, 2025

Weights & Biases Alternatives & Competitors

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Weights & Biases vs
Langfuse
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19 employees
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Weights & Biases vs
Pryon
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173 employees
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Compare Weights & Biases vs Pryon
Weights & Biases vs
Airtrain AI
Airtrain AI United States

The AI data platform. Data curation, fine-tuning, evaluation for LLMs.

Seed
11 employees
AI, Cloud Infrastructure
Also compare with: Weights & Biases vs Craft AI Craft AI Weights & Biases vs VAST Data VAST Data View all alternatives

FAQ About Weights & Biases

Experiment tracking and hyperparameter sweeps for AI researchers and engineers, by CoreWeave. Part of CoreWeave Forge.
Weights & Biases was founded in 2017.
Weights & Biases is headquartered in San Francisco, United States.
Weights & Biases operates in AI, Data Analytics, Developer Tools and Machine Learning. Its work centres on MLOps, LLMOps, GenAI Applications and Model Performance Visualization.
Weights & Biases has a B2B, SaaS and Platform business model. Its revenue comes from Subscription, Usage Based and Freemium.
As listed on Weights & Biases's pricing page on Oct 31, 2026: Free plan · $60/month · Enterprise on request (Free: free; Pro: $60/month; Enterprise: contact sales).
Weights & Biases has approximately 287 employees.
Weights & Biases has completed 7 funding rounds, raising a total of $1.95B. The latest funding stage is Acquired.
Top alternatives and competitors to Weights & Biases include Langfuse, Pryon, Airtrain AI, Craft AI, Fiddler AI. These companies operate in related industries and serve comparable markets. You can compare them side by side on Bounce Watch.
Weights & Biases and Langfuse are both companies in similar industries. Compare their funding, team size, growth signals, and market position on Bounce Watch to see which one fits your needs.

Source: BounceWatch company record for Weights & Biases, https://bouncewatch.com/company/weights-biases, updated 12 October 2026. When citing, please name BounceWatch and link this page.

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