Cut your AI costs
by 30-50%
ModelStack routes every request to the cheapest model that clears your quality bar. Drop-in OpenAI replacement, zero code changes.
of AI requests can be handled by cheaper models with no drop in quality.
You are probably paying for Claude Opus or GPT-4o on every call. Most of them never needed it. ModelStack fixes that automatically, so you keep the quality and stop overpaying.
wasted monthly per developer over-provisioning premium models
saved by the average ModelStack user in month one
Core feature
Meet ModelStacks
Build a stack of models. We route each request to the right one, automatically, by complexity and cost. Simple queries go cheap, complex ones go powerful, and you only pay for what each call needs.
40+ models, all at official rates
No markup. We only optimize which model handles each request, across every major provider.
Three steps to start saving
Zero configuration and no changes to your existing code.
Create a ModelStack
Add your preferred models to a stack. Set priorities and a routing mode.
Point your base URL
Aim your OpenAI SDK at ModelStack. Same params, same response format.
Watch costs drop
Auto-routing starts instantly, with real-time savings in your dashboard.
Integration made simple
A drop-in replacement for the OpenAI SDK. Change the base URL, point to your ModelStack, and auto-routing starts immediately. No refactoring required.
OpenAI & Anthropic compatible API
Works with your existing tools
DroidsTeams shipping on ModelStack
Fewer dollars per request, same output quality.
“ModelStack nearly halved our AI bill in the first month. The auto-routing just works, and we never touched our request code.”
“Drop-in replacement for OpenAI. We changed one URL and were live the same afternoon.”
“Better price-performance on every request. Easily the highest-leverage change we shipped this quarter.”
Start cutting your AI costs today
Free API key, no card required. You are routing in minutes.