Foundation Model APIs (LLM & Multimodal) · Vendor file
OpenRouter
openrouter.ai Claim this listing
Verified representative
B4 has approved a representative’s authority to speak for this company. This is not a product endorsement.
Unified API gateway routing to 500+ models across 60+ providers with automatic failover
Active · verified September 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.
LLM Gateway & Routing Pay-as-you-go per token; free-tier models available
Funding history
Acquisition (M&A) by Stripe $7B
$7B in disclosed funding across 1 recorded event.
OpenRouter compared
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.