> ## 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.

# 11.12.2025: Updated Anthropic Model List

> Available in Phoenix 12.15+

This update enhances the Anthropic model registrations in Arize Phoenix by adding support for the **4.5 Sonnet/Haiku variants** and removing several legacy **3.x Sonnet/Opus entries.**