LettavsWeights & Biases

Full side-by-side comparison — features, pricing, platforms, and which one wins in 2026.

Letta

AI Agent Frameworks

Build stateful AI agents with long-term memory

Full review →Website ↗

Weights & Biases

MLOps & Monitoring

ML experiment tracking, model management and monitoring

Full review →Website ↗
FeatureLettaWeights & Biases
CategoryAI Agent FrameworksMLOps & Monitoring
PricingFree (open-source) + CloudFree + Teams $50/mo
GitHub Stars
✓ More stars
13k
9k
PlatformsLinux, macOS, DockerLinux, macOS, Windows, Web
Key Features
  • ✓ Long-term memory
  • ✓ Stateful agents
  • ✓ Tool use
  • ✓ Multi-model
  • ✓ Self-editing memory
  • ✓ Experiment tracking
  • ✓ Model registry
  • ✓ Sweeps
  • ✓ Reports
  • ✓ Artifacts
Pros
  • + Solves long-term memory problem
  • + Self-editing memory
  • + Stateful agents
  • + Multi-model support
  • + Active research backing
  • + Best-in-class experiment tracking
  • + Beautiful visualization
  • + Team collaboration features
  • + Model registry
  • + Free for individuals
Cons
  • − Complex memory management
  • − Performance overhead
  • − Rebranding confusion
  • − Still experimental
  • − Can be overwhelming for beginners
  • − Teams pricing adds up
  • − Some features locked to enterprise
  • − Heavy client library
Tags
memorystatefulagentsopen-source
mlopstrackingexperimentsmonitoring

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