OpenRouter API

OpenRouter is a unified API in front of 300+ LLMs. Schema is OpenAI-compatible at /api/v1/chat/completions plus OpenRouter-only extensions (models[], provider, plugins, reasoning, cache_control, presets, :suffix shortcuts). Auth is Authorization: Bearer <OPENROUTER_API_KEY>.

Base URL & auth

POST https://openrouter.ai/api/v1/chat/completions
Authorization: Bearer $OPENROUTER_API_KEY
Content-Type: application/json

Optional attribution headers (enable leaderboard ranking):

• HTTP-Referer: <YOUR_SITE_URL>
• X-OpenRouter-Title: <YOUR_SITE_NAME> (X-Title also accepted)
• X-OpenRouter-Categories: <comma,separated>

API keys are created at https://openrouter.ai/keys. Each key supports a credit limit and works for OAuth flows. OpenRouter is a GitHub secret-scanning partner — leaked sk-or-... keys trigger email notification.