Letta vs OpenRouter

FeatureLettaOpenRouter
CategoryAI Agent FrameworksAI Development
PricingFree (open-source) + CloudPay-per-use (varies by model)
GitHub Stars13,000—
PlatformsLinux, macOS, DockerWeb
Features
  • ✓ Long-term memory
  • ✓ Stateful agents
  • ✓ Tool use
  • ✓ Multi-model
  • ✓ Self-editing memory
  • ✓ 200+ models
  • ✓ Unified API
  • ✓ Auto-fallback
  • ✓ Rate limiting
  • ✓ Usage tracking
  • ✓ OpenAI-compatible
Tags
memorystatefulagentsopen-source
apimulti-modelgatewayroutingpay-per-use