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OpenRouter API guide covering setup, Python and JavaScript, pricing, routing, fallbacks, privacy, tools, JSON, vision, and error handling.

Build OpenRouter model fallbacks with compatible models, clear failure rules, validation, cost controls, and a practical failover test plan.

Use OpenRouter embeddings for RAG and semantic search with model selection, chunking, permission filters, evaluation, and versioned indexes.

Use the OpenRouter vision API for images and PDFs. Learn request formats, model selection, cost controls, privacy, and evidence validation.

What is OpenRouter? Learn how its AI gateway connects models and providers, handles routing and billing, and supports reliable API workflows.

Create and secure an OpenRouter API key, set a spending cap, store it safely, test requests, monitor usage, and replace exposed credentials.

Use OpenRouter free models wisely. Compare the free router and :free variants, check quotas, test capabilities, and plan for changing availability.

Understand OpenRouter pricing, credit-purchase fees, BYOK charges, free limits, and a practical method for estimating API costs.

Fix an OpenRouter 429 error by checking gateway and provider limits, honoring Retry-After, controlling concurrency, and bounding retries.

Build an OpenRouter Python client with secure keys, timeouts, bounded retries, Retry-After handling, usage logs, and clear errors.

Control OpenRouter model routing by provider, capability, price, speed, privacy, and reliability, then verify behavior with a test matrix.

Use the OpenRouter image generation API to discover models, generate an image, validate returned files, and control cost and output quality.