The default is "medium". OpenRouter also offers the model slug openai/o3-mini-high to default the parameter to "high". The model features three adjustable reasoning effort levels and supports key developer capabilities including function calling, structured outputs, and streaming, though it does not include vision processing capabilities. Learn what OpenRouter is and how it unifies 400+ AI models through one API, with setup guidance and practical examples. What is OpenRouter ? Think of OpenRouter as a universal booking counter at an airport. Instead of going to separate airline counters (OpenAI, Anthropic, Google, Mistral, Meta, etc.), you go to one counter that gives you access to hundreds of LLM models from over 60 providers (all through a single, standardised API and a single API key). A router for LLMs and other AI models
