Vercel AI GatewayvsCartesia

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

Vercel AI Gateway

LLM APIs & Inference

Unified API gateway for routing app calls across hundreds of AI models

Full review →Website ↗

Cartesia

Voice & Audio

Ultra-low-latency realtime voice AI (Sonic)

Full review →Website ↗
FeatureVercel AI GatewayCartesia
CategoryLLM APIs & InferenceVoice & Audio
PricingFree monthly credits; pay-as-you-go at provider list price with no markupFree tier + usage-based
GitHub Stars——
PlatformsWeb, APIWeb, API
Key Features
  • ✓ Single API key
  • ✓ Hundreds of models
  • ✓ Unified model API
  • ✓ Provider routing and fallbacks
  • ✓ Automatic retries
  • ✓ Usage and spend monitoring
  • ✓ Bring Your Own Key
  • ✓ AI SDK and OpenAI-compatible APIs
  • ✓ Sub-100ms TTS
  • ✓ Instant voice cloning
  • ✓ Realtime API
  • ✓ On-device models
Pros
  • + One endpoint for many model providers
  • + Centralized usage, spend, and observability
  • + Automatic retries and fallbacks improve production resilience
  • + No token markup according to Vercel docs
  • + Works with AI SDK and OpenAI-compatible API clients
—
Cons
  • − Best fit for teams already building web apps or using Vercel/AI SDK
  • − Underlying provider terms and model limits still apply
  • − BYOK fallback can still consume AI Gateway credits
  • − Exact model pricing should be checked in the current Gateway model list
—
Tags
ai-gatewaymodel-routingvercelai-sdkllm-apibyokobservability
voicettsrealtimeagents

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