Cut your AI costs
by 30–50%.
ModelStack automatically routes each request to the cheapest model that meets your quality bar. Drop-in replacement for OpenAI. No code changes required.
of AI requests can be handled by cheaper models without quality loss
wasted per month by developers over-provisioning on premium models
average savings for ModelStack users in their first month
You're probably paying for Claude Opus or GPT-4o on every request. Most of them don't need it. ModelStack fixes that automatically.
Core Feature
Meet ModelStacks
Build a stack of models. We route each request to the right one — automatically, based on complexity and cost. Simple queries go to cheap models. Complex ones go to powerful ones. You pay only for what each request actually needs.
Every Model in Your Stack
40+ models — all at official rates
No markup. We just optimize which model handles your request.
How It Works
Three steps to start saving
Zero configuration. No changes to your existing code.
Add your preferred models to a stack. Set priorities and routing mode (auto or round-robin).
Point your OpenAI SDK to ModelStack. Keep your existing code — same params, same format.
Auto-routing kicks in instantly. Watch your costs drop with real-time savings analytics.
OpenAI & Anthropic compatible API
Works with your existing tools
DroidsIntegration Made Simple
Drop-in replacement for OpenAI SDKs. Change the base URL and point to your ModelStack. Auto-routing starts immediately — no refactoring required.
Trusted by Teams
What our users say
Join hundreds of teams saving on AI costs with ModelStack.
"ModelStack cut our AI costs by 45% in the first month. The auto-routing is seamless."
"Drop-in replacement for OpenAI. No code changes needed. We were live in 15 minutes."
"The intelligent routing means we get better performance at lower costs. Best decision we made."