A unified AI API gateway providing single-API-key access to 200+ models across OpenAI, Anthropic, Google, Meta, and every major provider. Pay-per-token with no monthly minimum, enabling indie developers to access all models through one integration instead of managing dozens of separate API accounts.
You add an OpenRouter layer on top of OpenAI/Anthropic. While this provides fallback and unified billing, it adds latency (typically +50-200ms) and an additional point of failure. For extremely latency-sensitive applications (e.g., real-time code completion), calling model APIs directly may be more suitable.
OpenRouter adds ~5% markup over the underlying model API prices. For high-volume scenarios (e.g., $1,000+/month in API costs), this difference means ~$600 extra per year. Once usage exceeds a threshold, switching to direct APIs can significantly reduce costs.
Models marked as Free on OpenRouter (e.g., certain open-source models) have extremely low rate limits and are unstable. Do not depend on Free models in production — they may be rate-limited or taken offline at any time.
When using Anthropic model prompt caching through OpenRouter, cache behavior may differ slightly from direct API. OpenRouter transparently passes cache headers, but cross-provider cache policies are inconsistent. Test your specific scenario.
| Latent Space - Deep Dive on OpenRouter | Article | - |
