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Best LLM API gateway / router

3 models · updated 2026-06-29

The verdict

LiteLLM leads — 2 of 3 models rank LiteLLM the top startup.

Not unanimous: Claude picks OpenRouter.

Combined ranking

  1. 1
    LiteLLM—14 pts
    GPT #1Claude #2Gemini #1· Broadest practical provider coverage, OpenAI-compatible proxy, self-hosting, routing, load balancing, fallbacks, virtual keys, budgets, spend tracking, admin UI, and strong open-source adoption
  2. 2
    OpenRouter—11 pts
    GPT #3Claude #1Gemini #3· Single OpenAI-compatible endpoint to 300+ models across every major provider, with automatic fallbacks, price/latency-based routing, unified billing, and zero-markup pass-through pricing that makes it the default for multi-model apps shipping fast.
  3. 3
    Portkey—11 pts
    GPT #2Claude #3Gemini #2· Most complete managed production gateway: universal API, conditional routing, fallbacks, retries, circuit breakers, load balancing, semantic cache, guardrails, observability, budgets, and self-host option
  4. 4
    Helicone—1 pts
    GPT —Claude —Gemini #5· Simple one-line proxy integration offering rapid deployment for cost tracking, latency metrics, and basic failover.

Not ranked (incumbents): Cloudflare AI Gateway, Vercel AI Gateway, Kong AI Gateway

By model

ChatGPT

  1. 1.LiteLLM
  2. 2.Portkey
  3. 3.OpenRouter
  4. 4.Vercel AI Gateway
  5. 5.Cloudflare AI Gateway

Claude

  1. 1.OpenRouter
  2. 2.LiteLLM
  3. 3.Portkey
  4. 4.Cloudflare AI Gateway
  5. 5.Kong AI Gateway

Gemini

  1. 1.LiteLLM
  2. 2.Portkey
  3. 3.OpenRouter
  4. 4.Cloudflare AI Gateway
  5. 5.Helicone

Tracked by ModelsAgree · rank 1 = 5 pts … rank 5 = 1 pt · re-polled continuously