companies

OpenRouter Inc.

Unified API and marketplace that routes requests to hundreds of large language models from many providers through one interface.

OpenRouter was founded in 2023 by Alex Atallah, previously the co-founder of the NFT marketplace OpenSea, along with co-founder Louis Vichy. The company is headquartered in New York City. OpenRouter provides a single unified API that gives developers access to hundreds of large language models from many providers (OpenAI, Anthropic, Google, Meta, and others) with automatic routing, fallback, and pay-as-you-go pricing, positioning itself as infrastructure for building AI applications without integrating each model provider separately. The company has raised roughly $173M in total funding, including a $12.5M seed round led by Andreessen Horowitz, a $28M Series A (April 2025) led by Menlo Ventures at a $500M valuation, and a $113M Series B (May 2026) led by CapitalG (Alphabet's growth fund), which pushed its valuation to roughly $1.3 billion.

Founded

2023

Headquarters

New York, United States

Sector

infrastructure