Stainless vs Vercel AI Gateway (2026)
Updated March 10, 2026
vs
Overview
Rating
10.0 / 10
Rating
10.0 / 10
Best For
AI companies and developers building API clients
Best For
Developers who want managed multi-provider model access and spend controls, especially teams already on Vercel or the AI SDK
Product Summary
Powers the official SDKs for OpenAI, Anthropic, and others. The de facto gateway interface layer.
Product Summary
Vercel AI Gateway routes hundreds of models through one API key with zero token markup. Compare its pricing, features, pros and cons, and alternatives.
Starting Price
$0Per month
Starting Price
$5
Free Trial
Yes
Free Trial
Yes
Free Version
Yes
Free Version
No
Website
Website
Key features
Core capabilities each platform advertises.
- SDK generation
- API interface
- Type-safe clients
- One API key for hundreds of models
- Provider and model fallbacks
- Request logs and spend dashboards
- Budgets by team, project, API key, or member
Strengths and tradeoffs
What each tool does well, and the limitations to keep in mind.
Pros
- Automates SDK dev
- Type-safe code
- Multi-language
Cons
- Requires OpenAPI
- Limited customization
Pros
- No markup on tokens, including with BYOK
- Callable from any infrastructure, not only Vercel deployments
- Ordered provider and model fallbacks
Cons
- No output evaluation or quality scoring
- Free tier limited to a subset of models with lower rate limits
- Budgets don't cover BYOK spend, and failed BYOK requests fall back to billed system credentials
- Team-wide ZDR, custom reporting, and trace drains are paid add-ons
Stainless or Vercel AI — which should you choose?
Choose Stainless if you wantChoose if you want
Data not available
Choose Vercel AI if you wantChoose if you want
- Multi-provider model access for AI SDK apps
- Provider failover for production agents
- Capping AI spend by project or API key
- Routing coding agent spend through one account
Compare Stainless and Vercel AI Gateway on your own traffic
10KFree traces/mo
1,000+Models
5 minSetup
Respan lets you trace LLM and agent calls across any model or framework, A/B test prompts on production traffic, and route requests across 1,000+ models through one gateway.
Try Respan free