Foundation Model APIs (LLM & Multimodal) · Vendor file

OpenRouter

Unified API gateway routing to 500+ models across 60+ providers with automatic failover

Active · verified June 2026

Categories OpenRouter serves

The B4 Index places OpenRouter in 2 categories. Each category page lays out the build-versus-buy considerations for that decision.

Foundation Model APIs (LLM & Multimodal) Primary

LLM Gateway & Routing Pay-as-you-go per token; free-tier models available

OpenRouter compared

OpenRouter vs LiteLLM

The B4 Index scores every software category on two axes, strategic differentiation and AI feasibility, to classify it Build, Buy, Bridge, or Beware. Vendor facts here are independent of that call. See the full methodology.