Semantic KernelvsLetta

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

Semantic Kernel

Developer Tools

Microsoft's AI orchestration SDK for building agents with .NET, Python, and Java

Full review →Website ↗

Letta

AI Agent Frameworks

Build stateful AI agents with long-term memory

Full review →Website ↗
FeatureSemantic KernelLetta
CategoryDeveloper ToolsAI Agent Frameworks
PricingFree (open-source)Free (open-source) + Cloud
GitHub Stars
✓ More stars
23k
13k
PlatformsLinux, macOS, WindowsLinux, macOS, Docker
Key Features
  • ✓ Plugin system
  • ✓ Memory
  • ✓ Planner
  • ✓ Multi-language
  • ✓ Azure integration
  • ✓ Long-term memory
  • ✓ Stateful agents
  • ✓ Tool use
  • ✓ Multi-model
  • ✓ Self-editing memory
Pros
  • + Enterprise-ready with Microsoft backing
  • + Multi-language (C#, Python, Java)
  • + Deep Azure OpenAI integration
  • + Plugin architecture for extensibility
  • + Solves long-term memory problem
  • + Self-editing memory
  • + Stateful agents
  • + Multi-model support
  • + Active research backing
Cons
  • − Heavy enterprise focus
  • − Verbose API compared to alternatives
  • − Complex memory management
  • − Performance overhead
  • − Rebranding confusion
  • − Still experimental
Tags
microsoftsdkenterprisedotnet
memorystatefulagentsopen-source

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