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Weights & Biases

Free tier

ML experiment tracking, model evaluation, and LLMOps platform used by leading AI teams

Free tier available·Technical·API available

Key strengths

AI experiment tracking (track, compare, reproduce experiments)AI application tracing and observabilityModel registry and lineage trackingServerless fine-tuning and reinforcement learningAgent development and evaluationHIPAA-compliant enterprise optionTeam collaboration with access controls
Free tier + paid plans · from $60 USD/mo
US
Founded 2017
Self-hostable

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Recent changes

  • Starting price: $50/mo → $60/mo
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Weights & Biases (Forge) — Documentation & Integration Notes

Weights & Biases (Forge) is designed to integrate into existing ML workflows with minimal friction. Key technical touchpoints include:

  • Experiment tracking: Instrument training scripts to log metrics, hyperparameters, and artifacts; compare runs across experiments for reproducibility.
  • Agent Lens: Tracing and observability layer for AI applications and agent pipelines — monitor execution flows, inputs/outputs, and performance.
  • Registry: Manage model versions and lineage centrally; supports governance workflows for model promotion and auditing.
  • Serverless SFT & RL: Trigger fine-tuning (supervised or reinforcement learning) jobs serverlessly — no infrastructure provisioning required.
  • Serverless & Dedicated Inference: Expose trained models via inference endpoints; choose between serverless (on-demand) or dedicated (reserved) compute.
  • Sandboxes & Notebooks: Integrated development environments for prototyping and agent evaluation.
  • ARIA: Integrated AI assistant/tooling within the platform.
  • CI/CD integration: Hook into existing CI/CD pipelines for automated training, evaluation, and deployment workflows.
  • Slack & email alerts: Configure notifications for run completions, failures, or threshold breaches.
  • Infrastructure: Runs on CoreWeave Cloud with NVIDIA GPU support.
  • Enterprise controls: HIPAA compliance, SSO, audit logs, and granular access controls available at the Enterprise tier.
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