
Weights & Biases
Founded Year
2017Stage
Acquired | AcquiredTotal Raised
$250MValuation
$0000About Weights & Biases
Weights & Biases operates as an artificial intelligence (AI) developer platform that provides tools for machine learning and artificial intelligence. The company offers products for building, fine-tuning, and deploying machine learning models, as well as tools for software developers to track and evaluate large language model applications. It serves the AI and machine learning sectors within the technology industry. It was founded in 2017 and is based in San Francisco, California. In March 2025, Weights & Biases was acquired by CoreWeave.7B.
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ESPs containing Weights & Biases
The ESP matrix leverages data and analyst insight to identify and rank leading companies in a given technology landscape.
The large language model (LLM) application development market provides frameworks, tools, and platforms for building, customizing, and deploying applications powered by pre-trained language models. Companies in this market offer solutions for fine-tuning models on domain-specific data, creating prompt engineering workflows, developing retrieval-augmented generation systems, and orchestrating LLM-p…
Weights & Biases named as Leader among 15 other companies, including Cohere, Anthropic, and LlamaIndex.
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Research containing Weights & Biases
Get data-driven expert analysis from the CB Insights Intelligence Unit.
CB Insights Intelligence Analysts have mentioned Weights & Biases in 6 CB Insights research briefs, most recently on May 1, 2025.

May 1, 2025 report
State of AI Q1’25 Report
Apr 3, 2025 report
State of Venture Q1’25 Report
Mar 6, 2025
The AI agent market map
Sep 29, 2023
The machine learning operations (MLOps) market map
Aug 31, 2023
The responsible AI market mapExpert Collections containing Weights & Biases
Expert Collections are analyst-curated lists that highlight the companies you need to know in the most important technology spaces.
Weights & Biases is included in 5 Expert Collections, including AI 100 (All Winners 2018-2025).
AI 100 (All Winners 2018-2025)
300 items
Winners of CB Insights' 5th annual AI 100, a list of the 100 most promising private AI companies in the world.
Generative AI
2,314 items
Companies working on generative AI applications and infrastructure.
AI 100 (2024)
100 items
Artificial Intelligence
10,047 items
AI agents
374 items
Companies developing AI agent applications and agent-specific infrastructure. Includes pure-play emerging agent startups as well as companies building agent offerings with varying levels of autonomy. Not exhaustive.
Latest Weights & Biases News
Jun 27, 2025
About us Weights & Biases: the AI developer platform.Build better models faster, fine-tune LLMs, develop GenAI applications with confidence, all in one system of record developers are excited to use. W&B Models is the MLOps solution used by foundation model builders and enterprises who are training, fine-tuning, and deploying models into production. W&B Weave is the LLMOps solution for software developers who want a lightweight but powerful toolset to help them track and evaluate LLM applications.Weights & Biases is trusted by over a 1,000 companies to productionize AI at scale including teams at OpenAI, Meta, NVIDIA, Cohere, Toyota, Square, Salesforce, and Microsoft.Sign up for a 30-day free trial today at http://wandb.me/trial. Website Industry Products Locations 🚨 Today, we announced our first product announcements post- CoreWeave acquisition.On stage at Fully Connected, we unveiled three major product updates that help teams build and deploy AI with more confidence, speed, and visibility. Here’s the rundown:🛠️ Announcement #1: Infrastructure ObservabilityOur new integration with CoreWeave's Mission Control, automatically pulls GPU & network error alerts right into W&B dashboards.📊 Announcement #2: W&B Weave Online EvaluationsShip smarter. Monitor live traces and score your AI agents in real time post-deployment. Diagnose issues faster, improve behavior on the fly, and boost agent reliability.⚡️ Announcement #3: W&B Inference powered by CoreWeaveOne console. Open-source LLMs. Powered by the most reliable GPUs in the industry. Pick your models in the Weave Playground or via API. Public preview is live — with a free tier included as well!We’re just getting started. 💪Full details of everything announced here: https://lnkd.in/gx4QweVe
Weights & Biases Frequently Asked Questions (FAQ)
When was Weights & Biases founded?
Weights & Biases was founded in 2017.
Where is Weights & Biases's headquarters?
Weights & Biases's headquarters is located at 400 Alabama Street, San Francisco.
What is Weights & Biases's latest funding round?
Weights & Biases's latest funding round is Acquired.
How much did Weights & Biases raise?
Weights & Biases raised a total of $250M.
Who are the investors of Weights & Biases?
Investors of Weights & Biases include CoreWeave, Generative AI Accelerator Challenge, Coatue, Bloomberg Beta, Insight Partners and 14 more.
Who are Weights & Biases's competitors?
Competitors of Weights & Biases include Chalk, Traceloop, 2021.AI, VESSL AI, LangWatch and 7 more.
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Compare Weights & Biases to Competitors

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Fiddler focuses on artificial intelligence (AI) observability and responsible AI governance in the technology sector. The company provides services such as monitoring, explainable AI, and analytics to support the performance and integrity of machine learning models and large language models. Fiddler serves sectors that need AI governance and risk management, including government and financial services. It was founded in 2018 and is based in Palo Alto, California.

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