WEIGHTS & BIASES, A COREWEAVE COMPANY

Weights & Biases is now part of CoreWeave

Weights & Biases gives AI teams the tools to track experiments, evaluate models, and improve them with confidence. As part of CoreWeave, it now lives in CoreWeave Forge: one connected environment to build, train, evaluate, and run models and agents.

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The acquisition, in plain terms

CoreWeave acquired Weights & Biases, Inc. (W&B) on May 5, 2025. Weights & Biases, founded in San Francisco in 2017 by Lukas Biewald, Chris Van Pelt, and Shawn Lewis, builds the AI developer platform that more than 1 million AI practitioners at 1,400+ companies, including OpenAI, Meta, and NVIDIA, use to track experiments and evaluate models. Weights & Biases now operates as part of CoreWeave (Nasdaq: CRWV) and is a product within CoreWeave Forge.

WHAT THE ACQUISITION MEANS

What this means for you

The same news reads differently depending on where you sit. Here's the version that applies to you.

EXISTING WEIGHTS & BIASES CUSTOMER

Your day-to-day doesn't change

Your account, projects, teams, and API keys stay the same. As of September 30, 2026, Free, Pro, and Enterprise SaaS accounts now sign in through CoreWeave Forge with the credentials you already use. Self-hosted and dedicated-instance accounts remain unchanged.

EXISTING COREWEAVE CUSTOMER

What the acquisition opens up for CoreWeave customers

CoreWeave Forge brings Weights & Biases experiment tracking and evaluation together with Training, Inference, Registry, and CoreWeave Sandboxes. Your teams can build, train, evaluate, and run models and agents in one connected environment, next to the infrastructure you already run on.

Evaluating either

Powerful separately, better together

Weights & Biases brings the tools AI teams use to track, evaluate, and improve models. CoreWeave brings the AI cloud built for the most demanding workloads. Together in CoreWeave Forge, you get one place to run the whole AI loop. Weights & Biases stays cloud-agnostic so you can work wherever your workloads live.

BETTER TOGETHER

Why the combination matters

Proven at scale

More than 1 million AI practitioners at 1,400+ companies use Weights & Biases, and teams have tracked more than 1 billion runs on the platform.

One connected loop

CoreWeave Forge connects Weights & Biases with Training, Inference, Registry, and Sandboxes, so teams move from experiment to production without switching tools.

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Any model, framework, or cloud

Weights & Biases stays cloud-agnostic, so you keep working wherever your workloads run.

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IN THEIR WORDS

From the people leading it

Three inference paths built on the award-winning CoreWeave Cloud. Move between them as your workloads evolve—without replatforming—so you always get predictable performance and infrastructure-aligned economics.

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Today's announcement accelerates our ability to power AI innovation with the scale, performance, and expertise that meets the demands of accelerated computing. It also builds on our recent IPO, creating new vectors for growth and broadened capabilities as a combined company. I am incredibly impressed by what the Weights & Biases team has achieved as the AI developer platform. Their relentless innovative spirit, customer obsession, and engineering excellence are traits that CoreWeave has always prioritized and will continue to do so as we enable AI builders in the inference era. Now with Weights & Biases, I have no doubt that we will push the boundaries of what's possible with AI for our customers.

Michael Intrator, co-founder and CEO, CoreWeave

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We expect that this combination will allow us to better serve our developers by accelerating investment in the Weights & Biases platform, maintaining our commitment to interoperability, and unlocking new valuable features by combining the hardware and software layers of the new AI tech stack. Together with CoreWeave, we believe we can empower customers to realize the potential of AI. I'm looking forward to combining our talented teams and complementary strengths—and for all that we will accomplish now that we've joined forces.

Lukas Biewald, SVP of AI, CoreWeave

FAQS

Frequently asked questions

NEWSROOM

Newsroom

The same news reads differently depending on where you sit. Here’s the version that applies to you.

PRESS RELEASE

CoreWeave Completes Acquisition of Weights & Biases

PRESS RELEASE

CoreWeave and Weights & Biases Announce New Products and Capabilities, Helping AI Developers Iterate Faster on Models and Agents

PRESS RELEASE

CoreWeave ARIA Launches as an AI Research and Iteration Agent With Autonomous Research and Collaborative Intelligence

CONTACT

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Existing customer support

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Media inquiries

Press and analyst questions about the acquisition go to CoreWeave Media.

Weights & Biases is now part of CoreWeave