Helicone vs Vercel AI Gateway
Updated March 10, 2026
Overview
Helicone is an open-source LLM observability and proxy platform. By adding a single line of code, developers get request logging, cost tracking, caching, rate limiting, and analytics for their LLM applications. Helicone supports all major LLM providers and can function as both a gateway proxy and a logging-only integration.
Vercel AI Gateway provides a unified API for accessing multiple LLM providers with built-in caching, rate limiting, and fallback routing. Integrated into the Vercel platform, it offers edge-optimized inference, usage analytics, and seamless integration with the Vercel AI SDK for production AI applications.
Key features
Core capabilities each platform advertises.
- LLM observability and monitoring
- Cost tracking and analytics
- Request caching
- Rate limiting and user management
- Open-source with managed option
Strengths and tradeoffs
What each tool does well, and the limitations to keep in mind.
Pros
- Extremely simple integration (one line of code)
- Open-source with self-hosting option
- Generous free tier (100k requests)
- Supports all major LLM providers
Cons
- Advanced features require paid tiers
- Data retention limited on free tier
- Self-hosting requires technical expertise
Pros
- Zero markup on tokens with bring-your-own-key—transparent pricing
- USD 5 monthly free credit enables risk-free experimentation
- Excellent developer experience with minimal setup
- Automatic failover ensures reliability when providers fail
Cons
- 504 Gateway Timeout errors for long-running agents beyond hard limits
- Pro plan maximum 300 seconds insufficient for complex agent workflows
- Semantic caching relies only on HTTP headers—misses equivalent prompts
- Vendor lock-in with custom middleware not portable to other platforms
Helicone or Vercel AI — which should you choose?
Choose Helicone if you wantChoose if you want
- LLM cost monitoring and optimization
- Production request debugging
- User-level usage tracking and rate limiting
- Caching to reduce latency and cost
- Team-wide LLM spend management
Choose Vercel AI if you wantChoose if you want
Compare Helicone and Vercel AI Gateway on your own traffic
Respan lets you trace LLM and agent calls across any model or framework, A/B test prompts on production traffic, and route requests across 500+ models through one gateway.