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

Founded 2017

Self-hostable

Facts verified against wandb.ai on Oct 6, 2026

Recent changes

Oct 6, 2026Starting price: $50/mo → $60/mo

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Weights & Biases (Forge) — Technical Overview

Tagline: Connect your AI loop and compound every improvement.

Weights & Biases (Forge) is an MLOps and AI development platform built for AI/ML practitioners and engineering teams across the full model lifecycle — from experiment tracking to production observability. Core capabilities include:

Experiment tracking: Log, compare, and reproduce training runs with granular metrics, hyperparameters, and artifact versioning.
AI application tracing & observability: Instrument and monitor AI pipelines and agent workflows end-to-end via Agent Lens.
Model registry & lineage: Centralized Registry for model versioning, lineage tracking, and governance.
Serverless fine-tuning & RL: Run Serverless SFT (supervised fine-tuning) and Serverless RL (reinforcement learning) without managing infrastructure.
Serverless & Dedicated Inference: Deploy models via serverless or dedicated inference endpoints.
Agent development: Build, evaluate, and sandbox agent workflows with integrated tooling (Agent Lens, Sandboxes, ARIA).
Integrations: CoreWeave Cloud, NVIDIA GPUs, Slack, CI/CD pipelines, Notebooks, and more.

Pricing:

Free: $0/mo (personal use)
Pro: $60/mo billed monthly (teams <50 employees; includes unlimited teams, access controls, CI/CD, Slack/email alerts)
Enterprise: Custom pricing (HIPAA compliance, SSO, audit logs)

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