The AI Model Marketplace OpenRouter Completes $40 Million Funding Round, Led by Andreessen Horowitz and Menlo Ventures

BlockBeats News, June 27th, according to The Wall Street Journal, AI model marketplace platform OpenRouter has completed a $40 million seed and Series A financing, with a valuation of approximately $5 billion. The round was led by Andreessen Horowitz and Menlo Ventures, with participation from Sequoia and several well-known industry investors. The funds will be used for product development, introducing new model types, and expanding enterprise support.

OpenRouter, founded by OpenSea co-founder and CTO Alex Atallah and Louis Vichy in 2023, provides a unified interface to connect over 400 large language models (LLMs), helping developers and companies streamline multi-model integration. Since its launch, the company has attracted over 1 million developers to use its API, with annual Inference spend growing from $10 million in October 2024 to over $100 million in May 2025. Clients range from startups to multinational corporations, supporting routing of mission-critical traffic.