What Is an LLM Gateway? The Missing Layer Between Your App and AI Models

An LLM gateway acts as a crucial middleware layer between applications and multiple AI model providers, centralizing request handling to manage authentication, access control, rate limits, intelligent routing, failover, observability, and cost tracking through a unified API. It simplifies integration by providing a consistent interface across providers, allowing dynamic routing, model switching without code changes, and consistent auditing and governance controls. LLM gateways differ from direct APIs, agent gateways, and MCP gateways by focusing on individual model requests and enabling seamless switching between providers to avoid vendor lock-in and enhance infrastructure flexibility. They are particularly beneficial for applications requiring multiple providers, failover logic, or cost controls, offering features such as unified API format, provider failover, cost management, and observability. Various LLM gateways, including OpenRouter, LiteLLM, Portkey, and Helicone, cater to different needs, such as compliance, self-hosting, or enhanced observability, with each gateway offering unique features and trade-offs based on infrastructure control, operational complexity, and compliance requirements.

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