OpenRouter offers a single API for accessing a wide range of large language models (LLMs) from multiple providers. It supports over 300 models from more than 60 active providers, such as OpenAI (e.g., GPT-5.1), Anthropic (e.g., Claude Opus 4.5), Google (e.g., Gemini 3 Pro Preview), and others like Meta, Microsoft, and NVIDIA. The API is fully compatible with the OpenAI SDK, allowing for easy integration. Key features include routing optimization for better uptime and competitive pricing without subscriptions. Typical use cases include AI-powered applications, research, and enterprise solutions requiring multi-model access.
