When you need a fast LLM endpoint, the first instinct is to spin up API Gateway—but Lambda Function URLs let you skip that extra hop entirely. Pair them with Claude’s function‑calling feature and you get a self‑contained AI service that’s ready in minutes. Yet most engineers still cling to the old, noisy stack.
Why Lambda Function URLs Beat API Gateway for LLM Endpoints
The problem with the “classic” stack
Imagine you’re sending a postcard. Using API Gateway is like handing the postcard to a postal clerk who stamps it, checks the address, and then hands it to the carrier. It works, but it adds a tiny delay and another place where something can go wrong.
Lambda Function URLs are the front‑door key: the postcard goes straight from your hand to the mailbox (the Lambda). There’s no middle‑man to configure, no extra cost for a separate service, and the latency is a few milliseconds lower.
