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Your load test passed with clean numbers, and real users still hit long stalls the moment you shipped.
What you'll have at the end
A concurrency number your app can actually handle, confirmed once against real, unmocked traffic
You need
A working version of your app that streams model replies to the user, plus something you can point that one call at instead of the real provider for a test run, even a single function you can swap out.
Not covered
Turning the concurrency number into how many replicas or how much infrastructure to buy: that math starts from the number this recipe finds, and stops here.
Put every model call behind one gateway that routes, caches, and falls back
Go there once you have a ceiling number and need somewhere to enforce it: the gateway is what actually caps concurrency and switches provider, while this recipe only finds the number it should be capped at.
Work out your app's cost per request before you build the rest
Start there instead if you don't yet know what a single request costs: this recipe assumes you already have that number and checks how many you can run at once, not what each one costs.
Checked 18 Aug 2026
Part of the AI Engineering cookbook