Semantic Kernel vs Letta

FeatureSemantic KernelLetta
CategoryAI DevelopmentAI Agent Frameworks
PricingFree (open-source)Free (open-source) + Cloud
GitHub Stars22,00013,000
PlatformsLinux, macOS, WindowsLinux, macOS, Docker
Features
  • ✓ Plugin system
  • ✓ Memory
  • ✓ Planner
  • ✓ Multi-language
  • ✓ Azure integration
  • ✓ Long-term memory
  • ✓ Stateful agents
  • ✓ Tool use
  • ✓ Multi-model
  • ✓ Self-editing memory
Tags
microsoftsdkenterprisedotnet
memorystatefulagentsopen-source