Monitoring

Weights & Biases

MLOps platform with W&B Weave for AI agent tracing and evaluation, W&B Inference for hosted open-source LLMs, and experiment tracking with sweeps.

freemium · $0-$50/mo

Visit website

Features

  • W&B Weave for agent traces, evaluations, and guardrails
  • W&B Inference for hosted open-source LLMs
  • Experiment tracking with hyperparameter sweeps
  • Model registry with versioned lineage
  • Framework integrations (LangChain, LlamaIndex, PyTorch)

Best use cases

Compatible tools

Anthropic

Claude Opus 4.6, Sonnet 4.5, and Haiku 4.5 with extended thinking, agent teams, MCP integration, and up to 1M token context windows.

usage-based

Open Tool

CrewAI

Multi-agent platform with open-source framework and Agent Management Platform (AMP). Visual editor, AI copilot, and enterprise deployment used by 60% of Fortune 500.

freemium

Open Tool

LangChain

Agent framework (v1.1) with create_agent abstraction, LangGraph stateful orchestration, middleware for retries and moderation, and model profiles.

open-source

Open Tool

OpenAI

GPT-5.2 and o-series reasoning models with the Responses API, AgentKit, and built-in tools for web search, code execution, and computer use.

usage-based

Open Tool