Alternatives

OpenRouter alternatives in 2026 (Portkey, LiteLLM, Vellum, Martian, Helicone)

Top OpenRouter alternatives in 2026: Portkey (enterprise routing), LiteLLM (open-source proxy), Vellum (prompt + model platform), Martian (intelligent routing), Helicone (observability + caching).

Why people search this

People look for OpenRouter alternatives because they want enterprise features (Portkey), self-host / open source (LiteLLM), prompt management on top (Vellum), intelligent routing (Martian), or observability-first tools (Helicone).

The ranking

#1

Portkey

Best for: Enterprises wanting one gateway with governance  ·  Price: Subscription + free tier

Enterprise LLM gateway with routing, fallback, caching, governance, and observability in one platform.

#2

LiteLLM

Best for: Self-host, OSS preference, framework-style use  ·  Price: Free OSS + paid cloud

Open-source Python library + proxy that unifies 100+ LLM provider APIs. Self-host or use their cloud.

#3

Vellum

Best for: Teams that want prompts + routing + evals together  ·  Price: Subscription

Prompt management + model gateway + evals in one platform. The all-in-one alternative to OpenRouter + Braintrust + a registry.

#4

Martian

Best for: Cost optimisation via intelligent routing  ·  Price: Per-token + commission

Intelligent model routing — automatically routes each request to the cheapest model that will produce sufficient quality.

#5

Helicone

Best for: Observability + caching, OpenAI-style direct integration  ·  Price: Free + paid

Observability-first gateway with caching, rate limiting, and tracing for LLM calls.

FAQ

Best OpenRouter alternative for enterprise?

Portkey — enterprise governance, routing, and observability in one platform.

Best OSS OpenRouter alternative?

LiteLLM — open-source Python library + proxy supporting 100+ providers.

Best for cost optimisation?

Martian — intelligent routing that picks the cheapest model that meets quality bar per request.

Related

Last updated: 2026-06-01.