Weights & Biases
https://forge.coreweave.com/wandb
Experiment-tracking and ML-ops platform (metrics, artifacts, sweeps, Weave tracing/evals). Acquired by CoreWeave (completed 2025-05-05, ~$1.7B); now part of CoreWeave Forge.
Acquired · Verified 2026-10-29 · fresh as of 2026-10-29 · 18 cited facts, 7 with a third-party source · 2 recorded changes · Suggest a correction
At a glance
- Type
- ML experiment tracking + ops third-party fix
- Tier
- T1
- Section
- Training infrastructure
- Latest release
- v0.31.0 (2026-10-16) — wandb registry fix
- License
- proprietary; wandb SDK MIT repo fix
- GitHub
- wandb/wandb — ~11.3k stars, last commit 2026-10 repo fix
- Pricing
- CoreWeave Forge plans: Free $0 (up to 5 model seats); Pro from $60/mo; Enterprise custom; Academic free vendor fix
- Funding
- Acquired by CoreWeave for ~$1.7B (agreement 2025-03, completed 2025-05-05); previously VC-backed vendor fix
- Freshness
- 2026-10-29 fix
- Layer
- model-infra repo fix
- Licensing
- commercial repo fix
- Developer activity
- OpenRank 36.35 (12-mo avg 54.17) · 54 participants — 2026-09 third-party fix
When to use
Optimised for: searched not found
Anti-fit: searched not found
Pros & cons
Pros
searched not found
Cons
searched not found
Claims & capabilities
$250M total raised through Series C ($50M, 2023-03; ~$1.25B post-money); 1M+ user accounts; CoreWeave announced acquisition of W&B in 2025-03 for ~$1.7B (closed 2025-05).
Technical surface
- API surface
- searched not found
- Backend storage
- searched not found
- Deployment
- searched not found
- Embedding model
- not applicable — not a memory product
- Multi-tenancy
- searched not found
- MCP
- searched not found
- A2A
- searched not found
- OpenTelemetry
- searched not found
Compare Weights & Biases with…
Similar systems
Other training infrastructure in the catalog, ranked by inbound references.
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- AWS SageMaker T1
AWS's managed ML platform — Studio, Training, HyperPod (large-scale clusters), Endpoints. Industry-standard for enterprise AWS-hosted training.
- Comet ML T2
ML experiment tracking + LLM evaluation platform (Opik for LLM eval). Comet competes head-to-head with Weights & Biases.
- Azure Machine Learning T1
Microsoft Azure's managed ML platform — pipelines, AutoML, Designer, prompt flow (LLM). Heavy integration with Azure OpenAI and Azure AI Studio.
- LoRA T3
Microsoft Research's Low-Rank Adapters method — trains rank-r matrices added to attention weights; 10000x parameter reduction. Foundation of all adapter-style fine-tuning.
- Argilla T2
Open-source data-quality platform for LLM training data — human-in-the-loop labelling, RLHF data collection, dataset curation. Acquired by Hugging Face 2024.
Sources (17 cited facts, 7 third-party)
Each fact links to the page it came from; the badge says who published it (how to read sources).
- What it is ML experiment tracking + ops third-party
- What it does & what's distinct Experiment-tracking and ML-ops platform (metrics, artifacts, sweeps, Weave tracing/evals… third-party
- Claims / benefits $250M total raised through Series C ($50M, 2023-03; ~$1.25B post-money); 1M+ user accoun… vendor
- Created 2017 third-party
- Latest release v0.31.0 (2026-10-16) — wandb registry
- License proprietary; wandb SDK MIT repo
- GitHub wandb/wandb — ~11.3k stars, last commit 2026-10 repo
- Funding Acquired by CoreWeave for ~$1.7B (agreement 2025-03, completed 2025-05-05); previously V… vendor
- Customers / scale OpenAI, Toyota, Meta, NVIDIA, Salesforce, BMW; 1M+ users. third-party
- Pricing CoreWeave Forge plans: Free $0 (up to 5 model seats); Pro from $60/mo; Enterprise custom… vendor
- HQ San Francisco, CA, USA. third-party
- Founders / pedigree Lukas Biewald (CEO), Chris Van Pelt, Shawn Lewis; founded 2017 (Lukas & Chris previously… third-party
- architecture-deployment-locus hybrid vendor
- licensing-bucket commercial repo
- positioning-platform-vs-product platform vendor
- taxonomy-three-layer-rollup model-infra repo
- developer-activity-opendigger {"activity":230.13,"as_of":"2026-09","openrank_12mo":54.17,"openrank_current":36.35,"par… third-party
What changed
Changes to this record's lifecycle, licence, release, pricing and hosting facts, from the catalog's git history. Subscribe (Atom)
- 2026-10-29
- Homepage “https://wandb.ai/” → “https://forge.coreweave.com/wandb”
- 2026-10-27
- License first recorded as “proprietary; wandb SDK MIT” source
- Latest release first recorded as “v0.31.0 (2026-10-16) — wandb” source
- Pricing first recorded as “CoreWeave Forge plans: Free $0 (up to 5 model seats); Pro from $60/mo; Enterprise custom; Academic free” source
- Funding / ownership “$250M total raised through Series C (2023-03, valuation reported ~$1.25B unicorn) — Insight Partners led.” → “Acquired by CoreWeave for ~$1.7B (agreement 2025-03, completed 2025-05-05); previously VC-backed” source
Related systems
References (22)
- Anthropic Claude (foundation models) integrates with — W&B Weave docs have a Anthropic Claude (foundation models) integration page. (verified 2026-10-29)
- AutoGen / AG2 integrates with — W&B Weave docs have a AutoGen / AG2 integration page. (verified 2026-10-29)
- Claude Agent SDK integrates with — W&B Weave docs have a Claude Agent SDK integration page. (verified 2026-10-29)
- Claude Code (Anthropic) integrates with — W&B Weave docs have a Claude Code (Anthropic) integration page. (verified 2026-10-29)
- Cohere Command R+ / Command A integrates with — W&B Weave docs have a Cohere Command R+ / Command A integration page. (verified 2026-10-29)
- CrewAI integrates with — W&B Weave docs have a CrewAI integration page. (verified 2026-10-29)
- DSPy integrates with — W&B Weave docs have a DSPy integration page. (verified 2026-10-29)
- Google Agent Development Kit (ADK) integrates with — W&B Weave docs have a Google Agent Development Kit (ADK) integration page. (verified 2026-10-29)
- Haystack (framework) integrates with — W&B Weave docs have a Haystack (framework) integration page. (verified 2026-10-29)
- LangChain (framework) integrates with — W&B Weave docs have a LangChain (framework) integration page. (verified 2026-10-29)
- LiteLLM integrates with — W&B Weave docs have a LiteLLM integration page. (verified 2026-10-29)
- LlamaIndex (framework) integrates with — W&B Weave docs have a LlamaIndex (framework) integration page. (verified 2026-10-29)
- Mistral Large 2 / Mixtral family integrates with — W&B Weave docs have a Mistral Large 2 / Mixtral family integration page. (verified 2026-10-29)
- Model Context Protocol (MCP spec) integrates with — W&B Weave docs have a Model Context Protocol (MCP spec) integration page. (verified 2026-10-29)
- OpenAI Agents SDK integrates with — W&B Weave docs have a OpenAI Agents SDK integration page. (verified 2026-10-29)
- OpenAI GPT family (GPT-5 / GPT-4o / o3 / o4) integrates with — W&B Weave docs have a OpenAI GPT family (GPT-5 / GPT-4o / o3 / o4) integration page. (verified 2026-10-29)
- OpenRouter integrates with — W&B Weave docs have a OpenRouter integration page. (verified 2026-10-29)
- Phidata (now Agno) integrates with — W&B Weave docs have a Phidata integration page. (verified 2026-10-29)
- Pydantic-AI integrates with — W&B Weave docs have a Pydantic-AI integration page. (verified 2026-10-29)
- smolagents (Hugging Face) integrates with — W&B Weave docs have a smolagents (Hugging Face) integration page. (verified 2026-10-29)
- Together AI integrates with — W&B Weave docs have a Together AI integration page. (verified 2026-10-29)
- Vercel AI SDK integrates with — W&B Weave docs have a Vercel AI SDK integration page. (verified 2026-10-29)
Referenced by (13)
- CrewAI integrates with — CrewAI docs have a Weights & Biases Weave observability integration page. (verified 2026-10-29)
- Dify integrates with — Dify monitoring integration: "Integrate with W&B Weave" (tracing). (verified 2026-10-29)
- Fireworks AI integrates with — Fireworks AI docs integration: Weights & Biases (MLOps & Observability). (verified 2026-10-29)
- Google Agent Development Kit (ADK) integrates with — ADK integrations catalog has a "W&B Weave observability for ADK" page (Log, visualize, and analyze model calls and agent performance). (verified 2026-10-29)
- Haystack (framework) integrates with — Haystack integrations directory has a Weights & Biases Weave Tracer integration page ("Send Haystack traces to Weights & Biases for monitoring and visualization"). (verified 2026-10-29)
- LiteLLM integrates with — LiteLLM docs have a Weights & Biases logging/observability integration page. (verified 2026-10-29)
- LlamaIndex (framework) integrates with — LlamaIndex has an official callback/observability integration package llama-index-callbacks-wandb in its repo. (verified 2026-10-29)
- OpenAI Agents SDK integrates with — OpenAI Agents SDK tracing docs list Weights & Biases under external tracing processors. (verified 2026-10-29)
- OpenAI Evals integrates with — OpenAI Evals README says evals can also be run and created using Weights & Biases. (verified 2026-10-29)
- OpenRouter integrates with — OpenRouter Broadcast docs have a page for sending request traces to W&B Weave. (verified 2026-10-29)
- TrueFoundry AI Gateway integrates with — TrueFoundry AI Gateway ecosystem lists a CoreWeave W&B Weave guardrails integration page. (verified 2026-10-29)
- Vercel AI SDK integrates with — AI SDK docs have a Weave observability integration page. (verified 2026-10-29)
- Weaviate integrates with — Weaviate's integrations / model-provider docs list Weights & Biases as an integration. (verified 2026-10-29)