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

# Prompt Versions

> Catalyst records a hash of each prompt so you can track changes and see which inferences used which version.

Every time Catalyst sees a new prompt for a task, it records a hash of the prompt content and treats it as a new version. You don't need to do anything to enable this. It happens automatically as requests flow through the gateway.

## How it works

Catalyst hashes the system message of each request. When the hash changes (because you updated your system prompt), a new version is created under that task. The previous versions are preserved, so you have a full history of every system prompt your task has used.

This means you can:

* See which prompt version a specific inference used
* View the full history of prompt changes for a task
* Filter inferences by prompt version to compare behavior across changes

## What triggers a new version

A change to the system message creates a new version. Changes to user messages, parameters like `temperature`, or the model do not currently trigger a new version.

## Coming Soon

* **Broader hashing** - future versions will include user message templates, model, and parameter changes in the version hash
* **Dataset filtering by version** - build training and eval datasets tied to a specific version of a prompt, so you can train on data from the version that performed best