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Weights & Biases - ML Experiment Tracking & LLM Evaluation | AI.info
Weights & Biases is the standard MLOps platform for experiment tracking, model versioning, and LLM evaluation. Used by 500,000+ ML practitioners at OpenAI, NVIDIA, and beyond.
Weights & Biases helps machine learning and AI teams track experiments, compare model runs, version datasets and models, and share results. Its platform includes W&B Models for model development and W&B Weave for tracing, evaluating, and monitoring AI applications and agents.
It is used by researchers, ML engineers, AI developers, and enterprise teams. The platform offers cloud-hosted and self-hosted deployment options, while inference, storage, data ingestion, and some sandbox usage can incur additional charges.
Features
- Track and visualize machine learning experiments
- Run automated hyperparameter sweeps
- Version datasets and models with W&B Artifacts
- Manage models, datasets, prompts, code, and metadata in a registry
- Trace and debug AI applications with W&B Weave
- Evaluate AI applications and compare model or prompt performance
- Monitor production AI applications and agent workflows
- Share findings through reports, tables, and collaborative dashboards
Use cases
- Track training runs and compare model performance
- Tune hyperparameters across distributed experiments
- Version datasets and model checkpoints for reproducibility
- Evaluate prompts, RAG pipelines, and agent applications
- Monitor production AI quality, latency, cost, and safety
- Coordinate model development across research and engineering teams
Pros
Cons
Pricing
- Starting price
- Free
- Pricing checked
- 2026-09-19
Free
$0/mo
- AI application evaluations
- AI application tracing
- AI application scorers
- AI model experiment tracking
- AI assets registry & lineage tracking
- Community Support
Pro
Starts at $60/month, billed monthly
- Unlimited teams for collaboration
- Team-based access controls
- Service Accounts
- Priority email & chat support
- CI/CD automations
- Slack and email alerts
Enterprise
Custom plans
- Single tenant option with choice of region
- HIPAA compliant option
- Secure private connectivity
- Customer-managed encryption key
- Single Sign On
- Automated user provisioning
- Custom roles
- Audit logs
Personal
$0/mo
- 1 user seat
- Experiment tracking
- Registry & lineage tracking
- Run a W&B server locally
- For personal projects only
Advanced Enterprise
Custom plan
- Flexible deployment options
- HIPAA compliant option
- Secure private connectivity
- Customer-managed encryption key
- Single Sign On
- Automated user provisioning
- Custom roles
- Audit logs