Compare real outcomes from your users for each model
Operation
Open source, installed and run on your own servers
Gateway operated by ABTO
Model assignment
Load balancing and fallback to another model on failure
Split users by the ratio you set and keep each user on the same model
Measuring results
Usage, cost and budget controls with call logs
Payments and sign-ups linked to the model that answered
Setup
Install and configure the proxy, then change the API URL
Change the API URL and add one line of SDK code
Descriptions of other tools are based on each company's public documentation as of October 2026. Features and pricing can change, so check their documentation for the latest details.
What LiteLLM does well
LiteLLM is an open-source library and proxy server that lets you call model APIs from many companies in the OpenAI format. It includes operational features such as per-team API keys and budgets and fallback to another model on failure.
It suits teams that want to run their own infrastructure and have people to do it.
What ABTO does
ABTO focuses on learning which model suits your service from how your users respond. It splits users across models by the ratio you set, and when a payment or sign-up happens it records the model that answered that user.
ABTO runs the gateway, so you start an experiment by changing ratios in the dashboard instead of standing up a server.
Which one should you pick?
If running the call path yourself and managing keys and budgets in detail comes first, LiteLLM fits. If you want to know how switching models changes revenue and sign-ups without running servers, ABTO fits.