Weights & Biases
- Company typePrivate
- Founded2016
- HeadquartersSan Francisco, United States
- Headcount251–500
- GTM typeB2B
- OfferingSoftware
Weights & Biases firmographics
Firmographics- Name
- Weights & Biases
- Legal name
- Weights & Biases, Inc.
- Website
- https://wandb.ai
- Company type
- Private
- Founded year
- 2016
- Operating status
- Operating
- Headcount range
- 251–500 employees
- Ownership category
- akta.pro rank
Weights & Biases industry classification
Industry- Product category
- MLOps and LLMOps Platform
- NAICS
- Software Publishers (513210), Software Publishers (5132)
- SIC
- Services-Prepackaged Software (7372)
- akta.pro primary industry
- End-to-End MLOps & ML Platform Suites (HDAAABAA)
- akta.pro secondary industries
- Prompt Engineering, Orchestration & LLMOps Tooling (HDAAACAD), Experiment Tracking, Metadata & Model Registry (HDAAABAC)
Keywords
Where Weights & Biases is headquartered
LocationHeadquarters
- HQ city
- San Francisco
- HQ country
- United States
- HQ region
- North America
Offices1 record
Markets served
Weights & Biases business model
Business model- GTM type
- B2B
- Offering type
- Software
- Cost components
- Personnel, Technology or R&D, Infrastructure, Marketing or Sales, Operations
Revenue model
- Subscription Licenses: SaaS subscription model with tiered pricing based on team size and feature access. Free tier for individual use, paid tiers for professionals and teams, and enterprise plans with advanced features and support.
- Enterprise Licensing: Enterprise tier with custom pricing for organizations requiring advanced governance, security features, and dedicated support for large-scale AI development operations.
Pricing tiers
| Model | Billing | Price |
|---|---|---|
| Freemium | Monthly | Free tier for individual researchers and developers |
| Per seat | Monthly | Paid professional and team plans |
| Subscription | Annual | Enterprise tier with advanced features |
Go-to-market motion2 records
Distribution channels4 records
Marketing channels4 records
Weights & Biases product offering
Product offeringCore offering
Weights & Biases builds a developer-first MLOps and LLMOps software platform that enables AI/ML engineers and enterprise AI teams to track experiments, version datasets and models, monitor LLM applications in production, evaluate and fine-tune large language models, and automate AI workflows. The platform is offered as a SaaS subscription with a free individual tier, paid professional/team plans, and custom enterprise licensing.
Product overview
Weights & Biases is an AI developer platform providing end-to-end MLOps and LLMOps capabilities, acquired by CoreWeave in March 2025 for approximately $1.7 billion. The platform offers a suite of integrated products including W/B Weave for LLM observability and evaluation, W/B Registry for model and dataset governance with versioning, W/B Traces for logging and debugging, W/B Reports for collaborative documentation, W/B Artifacts for dataset and model versioning, W/B Automations for workflow streamlining, W/B Inference for open-source LLM API access, W/B Training for serverless reinforcement learning and fine-tuning, W/B Guardrails for AI safety, and W/B Skills for autonomous agent improvement. The products work together as an integrated platform enabling the full AI development lifecycle from experimentation through production deployment and monitoring.
Differentiator
Problem solved
Functional benefit
Brands
- W&B Weave: LLM observability platform for evaluating, monitoring, and improving AI systems in production
- W&B Registry
- W&B Training
- W&B Inference
- Serverless RL
- W&B Reports
- W&B Traces
- W&B Automations
- W&B Artifacts
- W&B Guardrails
Products and services
- W&B Weave LLM observability and evaluation platform that enables teams to evaluate, monitor, and improve AI systems in production, with tracing, cost tracking, latency monitoring, and safety guardrails for multi-step agentic workflows.
- W&B Registry Centralized model and dataset governance platform providing versioning, access control, and lifecycle management for ML models, datasets, and experiments.
- W&B Training / Serverless RL Serverless training platform offering reinforcement learning and supervised fine-tuning for large language models, leveraging CoreWeave GPU cloud infrastructure for elastic scale and reduced training cost.
- W&B Inference API and playground access to open-source large language models for developing AI applications with serverless inference.
- W&B Guardrails AI safety and security tool providing guardrails across the AI lifecycle to prevent data leakage, detect harmful outputs, and ensure regulatory compliance for enterprise deployments.
- W&B Skills Autonomous improvement capability enabling AI agents to continuously learn from real-world production experience through live interaction feedback, integrated with CoreWeave's unified agentic AI platform.
- CoreWeave Sandboxes via W&B Serverless Runtime Secure, isolated sandbox environments for AI reinforcement learning, agent tool use, and model evaluation, delivered as a serverless runtime through W&B leveraging CoreWeave infrastructure.
Quantifiable outcome
- 91% accuracy in hallucination detection benchmark tests with W&B Weave
- +2 more outcomes
Companies that use Weights & Biases
Customer profileNamed customers5 records
Segments3 records
Ideal customer profiles3 records
Weights & Biases technology and API
TechnologyTechnology focussed Yes
API detail
- Has API
- Yes
- API docs
- API detail
Core technology
AI maturity
App detail
Integration4 records
AI capability9 records
Feature7 records
Weights & Biases partnerships and signals
Strategic signalPartnerships
Six partnerships are on record, tiered core, flagship and major.
- Cranium AIcoreStrategic integration partnership that embeds AI safety, security, and governance evaluations as a native step in the AI model development lifecycle. Enables enterprise teams to run automated security and compliance scans on models stored in the W&B Registry, with findings written back to model records to create a single source of truth for data scientists, security teams, and governance leaders.
- CoreWeave (via acquisition)flagshipCoreWeave acquired Weights & Biases for approximately $1.7 billion in March 2025 (deal completed May 2025). W&B is now a wholly-owned subsidiary providing the developer platform layer for CoreWeave's AI cloud platform, enabling integrated training, inference, and observability capabilities.
- Amazon Web Services (AWS)majorCo-authored technical guide demonstrating integration of W&B Weave with Amazon Bedrock and AgentCore for enterprise AI development. W&B Weave available in AWS Marketplace AI Agents and Tools category for native observability of Bedrock deployments.
- NTT DATAcoreCollaboration to accelerate custom LLM development and scale agentic AI innovation for enterprise customers. Partnership enables NTT DATA to offer W&B tools as part of its enterprise AI solutions.
- LG CNScorePartnership to expand Agentic AI agenda in South Korea, combining LG CNS's regional presence with W&B's AI development platform capabilities.
- Lambda LabsmajorStrategic partnership formed in May 2023 to provide GPU cloud infrastructure and MLOps tools for AI and deep learning workloads, combining Lambda's GPU cloud services with W&B's experiment tracking platform.
Scale indicators5 records
Recent moves6 records
Expansion highlights5 records
Weights & Biases competitors and assessment
Company assessmentDirect peers
- MLflow: Open-source ML lifecycle management platform originally developed by Databricks covering experiment tracking, model registry, and model deployment. Most direct open-source competitor to W&B's experiment tracking and model registry capabilities.
- Neptune.ai: Experiment tracking and model registry platform for ML and LLM workflows. Competes head-to-head with W&B on experiment tracking, model versioning, and team collaboration for ML engineers and researchers.
- Comet ML: MLOps platform offering experiment tracking, model production monitoring, and LLM evaluation. Overlaps directly with W&B Weave (LLM observability) and W&B core experiment tracking product.
- LangSmith: LLM application observability, evaluation, and debugging platform from LangChain. Directly competes with W&B Weave for monitoring, tracing, and evaluating LLM-powered applications and agents.
- Arize AI: ML/LLM observability and evaluation platform offering tracing, drift detection, and agent monitoring. Competes with W&B Weave in LLM observability and with broader W&B product in production model monitoring.
- WhyLabs: AI observability platform providing model monitoring, data quality, and LLM guardrails. Overlaps with W&B Traces, W&B Guardrails, and parts of W&B Weave on production monitoring for ML and LLM systems.
- Domino Data Lab: Enterprise MLOps platform providing experiment tracking, model management, and collaborative data science environments. Competes with W&B in the enterprise MLOps and model governance category.
Broad incumbents
- Amazon SageMaker: AWS's end-to-end ML platform covering data prep, training, experiment tracking, model registry, deployment, and monitoring. Already integrated with W&B Weave via Amazon Bedrock and AgentCore but competes as a broader incumbent for enterprise MLOps workloads.
- Google Vertex AI: Google Cloud's unified ML platform spanning training, experiment tracking, model registry, and MLOps features. Competes with W&B for enterprise customers seeking an integrated cloud-vendor MLOps stack.
- DataRobot: Enterprise AI platform offering model building, governance, and MLOps capabilities. Cited as a competitor in AI governance tools alongside W&B and addresses enterprise AI team segments with broader automation features.
Market position
Strengths5 records
Weaknesses5 records
Competitive moat5 records
Key risks5 records
Key highlights7 records
Customer concentration
Weights & Biases social profiles
Digital presenceWeights & Biases financial estimates
Financial estimateRevenue estimate
Valuation estimate
Weights & Biases leadership team
Management profileNumber of profiles
Profiles7 records
Weights & Biases funding detail
Funding detailFunding overview
Funding rounds7 records
Investors16 records
Funding detail is available on the Subscription and Enterprise plan.Contact sales →
Weights & Biases M&A and investment
M&A and investmentM&A
Investments1 record
M&A and investment is available on the Subscription and Enterprise plan.Contact sales →
Frequently asked questions about Weights & Biases
What does Weights & Biases do?
Weights & Biases builds a developer-first MLOps and LLMOps software platform that enables AI/ML engineers and enterprise AI teams to track experiments, version datasets and models, monitor LLM applications in production, evaluate and fine-tune large language models, and automate AI workflows. The platform is offered as a SaaS subscription with a free individual tier, paid professional/team plans, and custom enterprise licensing.
Is Weights & Biases a public or private company?
Weights & Biases is a private company. It is classified as corporate owned and is currently operating.
When was Weights & Biases founded?
Weights & Biases was founded in 2016. It employs 251 to 500 people.
Where is Weights & Biases based?
Weights & Biases is headquartered in San Francisco, United States, in the North America region.
How does Weights & Biases make money?
Two revenue lines are on record. Subscription Licenses are the primary driver. The others are enterprise Licensing.
Who are Weights & Biases's main competitors?
Direct peers on record are MLflow, Neptune.ai, Comet ML, LangSmith, Arize AI, WhyLabs and Domino Data Lab. Broad incumbents are Amazon SageMaker, Google Vertex AI and DataRobot.
Does Weights & Biases have an API?
Yes. Weights & Biases provides an API that enables developers to programmatically track experiments, manage models and datasets, and automate ML workflows. The platform offers tools for experiment tracking, model monitoring, dataset versioning, and integration with CI/CD pipelines for ML model deployment.
What industry is Weights & Biases in?
Weights & Biases's product category is MLOps and LLMOps Platform. Its primary akta.pro industry code is HDAAABAA, End-to-End MLOps & ML Platform Suites, with a secondary code of HDAAACAD, Prompt Engineering, Orchestration & LLMOps Tooling. Its NAICS code is 513210 and its SIC code is 7372.