OpenRouter
Category: AI Developer Tools
A unified API and marketplace that provides access to a wide variety of large language models (LLMs) and generative AI models from different providers. It acts as a router to find the best model for any given request based on performance and cost. OpenRouter was founded in 2023. The company is led by Alex Atallah. Based in San Francisco, CA, USA. Team size: 11-50. Total funding raised: $40 Million. Latest round: Series A, $28.0M, 2025-04, led by Menlo Ventures. Key investors include Menlo Ventures (led Series A), Andreessen Horowitz (led Seed), Sequoia Capital.
- Founded
- 2023
- Headquarters
- San Francisco, CA, USA
- Team size
- 11-50
- Total funding
- $40 Million
Value proposition
Access the best AI models from any provider with a single API, enabling easy comparison, cost optimization, and routing requests to the most suitable model. Simplifies billing and integration complexities.
Products and solutions
Unified REST API for over 400 AI models, Model Router (finds best model for a given prompt), Marketplace of models from 60+ providers (including OpenAI, Anthropic, Google, Meta), Usage and analytics dashboard, Standardized API format for all models
Unique value
OpenRouter acts as a neutral aggregator, uniquely combining proprietary models (like GPT-4, Claude 3) and open-source models in a single interface. It provides real-time data on model performance and popularity, allowing for direct comparison and intelligent routing.
Target customer
Developers, startups, and companies building AI-powered applications who want to avoid vendor lock-in and easily switch between models to optimize for cost and performance.
Industries served
Software Development, Technology, Artificial Intelligence, Enterprise IT
Technology advantage
The core advantage is its 'model router' capability, which can automatically select the best or most cost-effective model for a given task. This simplifies development and optimizes costs by abstracting away the complexity of managing multiple API keys and integrations.
How they differentiate
While competitors often focus on hosting and fine-tuning open-source models, OpenRouter's primary focus is on being a universal API gateway or 'router' for both proprietary and open-source models, emphasizing flexibility, cost-optimization, and ease of switching.
Main competitors
Together.ai, Replicate, Anyscale, Unify.ai
Key partnerships
OpenAI, Anthropic, Google, Meta, Mistral AI, Microsoft, Hugging Face
Major milestones
Launched public platform in 2023 Secured $40M in combined Seed and Series A funding in June 2024 Grew to support over 400 models from 60+ providers Reached nearly $100M in annualized inference volume in May 2024
Growth metrics
Reached approximately $100M in annualized inference volume by May 2024, representing 10x growth since October 2023.
Market positioning
Positioned as a developer-first infrastructure layer for multi-model AI applications, appealing to users who prioritize performance, cost, and flexibility over commitment to a single ecosystem.
Geographic focus
Global
Patents and IP
Information not publicly available.
About Alex Atallah
Alex Atallah is a seasoned entrepreneur and technologist with a strong background in software engineering and a proven track record of building successful companies in the tech and crypto space. He co-founded OpenSea, the world's largest NFT marketplace, and served as its CTO, scaling the platform to a multi-billion dollar valuation. His experience at Palantir Technologies provided him with a solid foundation in data analysis and software development. He is a Y Combinator alumnus, which has given him extensive experience in the startup ecosystem. His current venture, OpenRouter, leverages his expertise in decentralized systems and AI, aiming to create a unified API for large language models. His career demonstrates a consistent ability to identify and capitalize on emerging technological trends.
Official website: https://openrouter.ai