AI API Gateway Architecture Guide 2026

Why You Need an AI API Gateway If your app uses AI APIs, you have probably hit these problems: Costs spiral as usage grows Single vendor lock-in makes you fragile Rate limits hit at the worst times No visibility into which requests cost the most An AI API gateway solves all four. Architecture Overview Your App sends an OpenAI-compatible request to the Gateway. The Gateway has three layers: Router detects task type and picks the best model Balancer manages rate limits and load distribution Fallback handles failures with automatic retries The request then goes to the best available model.