OpenRouter is a model gateway that unifies access to many LLMs — Claude Sonnet, GPT-5, Gemini Pro, Llama 4, DeepSeek V3, and others — behind a single OpenAI-compatible API. With one key developers can switch among dozens of providers, compare prices, and configure fallbacks. It has become a common substrate for the AI Wrapper Apps and Coding Agents worlds. It pairs cleanly with tools like Cursor, Cline, and Aider.
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