> ## Documentation index
> Fetch the complete documentation index at: https://arize.com/llms.txt
> Ask it with GET https://arize.com/ask?q=<keywords or question>. Short keywords rank best.
> Use these 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>