Weights & Biases
ML experiment tracking and LLM evaluation platform, acquired by CoreWeave
Is Weights & Biases dead?
Not exactly. Weights & Biases has been acquired; the product may continue under new ownership or be merged.
- Launched
- Last verified
Weights & Biases (W&B) is a developer platform for tracking machine-learning experiments, versioning models and datasets, and evaluating LLM apps with its Weave toolkit. It was aimed at analysts, founders and teams who want answers from data without heavy manual work. CoreWeave completed its acquisition of Weights & Biases on May 5, 2025. The product continues under the W&B brand as part of the CoreWeave AI cloud. Users can keep working as before. If you need something similar today, popular options include MLflow, Comet, Langfuse. Lesson for users: always keep your own copies of important data when you rely on any AI service, because products can change owners or close with little notice. When choosing a replacement, check that it offers data export, clear pricing and an active development history.
What happened
CoreWeave completed its acquisition of Weights & Biases on May 5, 2025. The product continues under the W&B brand as part of the CoreWeave AI cloud. Users can keep working as before.
Active alternatives
Frequently asked questions
Was Weights & Biases acquired?
CoreWeave completed its acquisition of Weights & Biases on May 5, 2025. The product continues under the W&B brand as part of the CoreWeave AI cloud.
What should Weights & Biases users do now?
Users can keep working as before.
What are the best Weights & Biases alternatives?
Popular alternatives include MLflow, Comet, Langfuse.
Sources
- Official CoreWeave investor release: acquisition completed May 5, 2025.
- Official website: https://wandb.ai
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