> ## Documentation Index
> Fetch the complete documentation index at: https://arizeai-433a7140.mintlify.site/llms.txt
> Use this file to discover all available pages before exploring further.

# 09.27.2025: Dataset Splits

> Available in Phoenix 12.0+

<Update label="09.27.2025">
  Phoenix now supports **custom dataset splits**, allowing users to categorize examples into groups like *train*, *validation*, or *test*. This feature is essential for judge building, structured experimentation, and broader data science workflows. It provides more flexibility in organizing datasets and improves analysis across subsets of data.
</Update>