LettavsVercel AI SDK

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 ↗

Vercel AI SDK

Developer Tools

TypeScript toolkit for building AI-powered web applications

Full review →Website ↗
FeatureLettaVercel AI SDK
CategoryAI Agent FrameworksDeveloper Tools
PricingFree (open-source) + CloudFree (open-source)
GitHub Stars
✓ More stars
13k
12k
PlatformsLinux, macOS, DockerWeb
Key Features
  • ✓ Long-term memory
  • ✓ Stateful agents
  • ✓ Tool use
  • ✓ Multi-model
  • ✓ Self-editing memory
  • ✓ React hooks
  • ✓ Streaming
  • ✓ Multi-model
  • ✓ Tool calling
  • ✓ Structured output
  • ✓ Edge runtime
Pros
  • + Solves long-term memory problem
  • + Self-editing memory
  • + Stateful agents
  • + Multi-model support
  • + Active research backing
  • + First-class React/Next.js integration
  • + Built-in streaming support
  • + Multi-provider (OpenAI, Anthropic, local)
  • + Type-safe with TypeScript
Cons
  • − Complex memory management
  • − Performance overhead
  • − Rebranding confusion
  • − Still experimental
  • − Best suited for Vercel/Next.js ecosystem
  • − Limited outside web context
Tags
memorystatefulagentsopen-source
open-sourcetypescriptreactstreamingsdk

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