LettavsRunway

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 ↗

Runway

AI Image & Video

AI-powered creative tools for video and image generation

Full review →Website ↗
FeatureLettaRunway
CategoryAI Agent FrameworksAI Image & Video
PricingFree (open-source) + CloudFree + Pro $12/mo
GitHub Stars
✓ More stars
13k
—
PlatformsLinux, macOS, DockerWeb
Key Features
  • ✓ Long-term memory
  • ✓ Stateful agents
  • ✓ Tool use
  • ✓ Multi-model
  • ✓ Self-editing memory
  • ✓ Video generation
  • ✓ Image editing
  • ✓ Gen-2 model
  • ✓ Green screen
  • ✓ Motion tracking
Pros
  • + Solves long-term memory problem
  • + Self-editing memory
  • + Stateful agents
  • + Multi-model support
  • + Active research backing
  • + Leading AI video generation
  • + Creative suite of tools
  • + Text-to-video capability
  • + Professional quality
  • + Regular model updates
Cons
  • − Complex memory management
  • − Performance overhead
  • − Rebranding confusion
  • − Still experimental
  • − Expensive credits system
  • − Short video clips only
  • − Quality can be inconsistent
  • − Rendering takes time
Tags
memorystatefulagentsopen-source
videocreativegenerationediting

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