> ## Documentation Index
> Fetch the complete documentation index at: https://docs.heybreez.ai/llms.txt
> Use this file to discover all available pages before exploring further.

# A/B Test

The **A/B Test** node lets you split callers between two different paths in your workflow.\
This is useful for experimenting with variations — such as different prompts, voices, flows, or logic — and measuring which performs better.

Traffic is split **once per caller** using sticky assignment, meaning a returning caller will continue down the same variant they were originally assigned to.

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## Main Settings

### **Probability to A (%)**

Controls what percentage of callers should go to **Variant A**.

* Range: **0–100%**
* Whatever is *not* routed to A automatically goes to **Variant B**

Examples:

* **50%** → even split
* **90%** → most callers go to A
* **0%** → all callers go to B

This setting only determines distribution—both branches can contain any nodes you want.

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## Outputs

The A/B Test node provides two output connectors:

* **A** → callers assigned to Variant A
* **B** → callers assigned to Variant B

Connect each output to the next node in that variant’s flow to define your experiment branches.

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