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OpenRouter, the one-stop routing layer for large language models, has raised a $40M combined Seed and Series A round led by Andreessen Horowitz and Menlo Ventures, with backing from Sequoia and prominent angels. Now valued at $500M, OpenRouter is emerging as core infrastructure for multi-model AI development.
⢠Connects to models from OpenAI, Anthropic, Mistral, Google, Meta, and more via a single API
⢠Automatically routes requests based on latency, cost, or performance preferences
⢠Offers transparent pricing and usage tracking across providers with just a 5% platform fee
⢠$100M+ inference run rate as of May 2025 â up 10Ă since October
⢠Over 1M developers using the platform, handling trillions of tokens weekly
⢠Runs on 50+ cloud hosts with edge latency as low as 25ms
⢠Integrates with Zapier, VS Code, Cloudflare, PostHog, and more
⢠Partnered early with OpenAI for GPT-4.1 rollout and usage insights
⢠Offers enterprise-ready tools for routing, analytics, and failover protection
As the AI stack fragments, OpenRouter is stitching it back togetherâoffering developers and enterprises a unified gateway to the future of multi-model AI.