Vercel AI SDK vs OpenRouter

FeatureVercel AI SDKOpenRouter
CategoryAI DevelopmentAI Development
PricingFree (open-source)Pay-per-use (varies by model)
GitHub Stars12,000—
PlatformsWebWeb
Features
  • ✓ React hooks
  • ✓ Streaming
  • ✓ Multi-model
  • ✓ Tool calling
  • ✓ Structured output
  • ✓ Edge runtime
  • ✓ 200+ models
  • ✓ Unified API
  • ✓ Auto-fallback
  • ✓ Rate limiting
  • ✓ Usage tracking
  • ✓ OpenAI-compatible
Tags
open-sourcetypescriptreactstreamingsdk
apimulti-modelgatewayroutingpay-per-use