OpenRouter Documentation
Official OpenRouter developer docs (sourced from openrouter.ai/docs).
CRITICAL: grep references/ for keywords before answering. Do NOT guess API behavior.
Topic Index
Getting Started
quickstart.md— API quickstartfaq.md— FAQenterprise-quickstart.md— Enterprise setup
Guides
guides/overview/— Principles, models, multimodal, authguides/routing/— Model fallbacks, provider selection, model variantsguides/features/— Tool calling, structured outputs, plugins, presets, ZDRguides/best-practices/— Latency, prompt caching, uptime, reasoning tokensguides/privacy/— Data collection, loggingguides/community/— Framework integrations (Vercel AI SDK, LangChain, etc.)
API Reference
api/reference/— Overview, streaming, parameters, errors, authenticationapi/reference/responses/— Responses APIapi/api-reference/— REST endpoints (chat, embeddings, models, keys, etc.)
SDKs
sdks/typescript/— TypeScript SDKsdks/python/— Python SDK