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

# Deprecating on 5/25/2026

* The following models are being deprecated and replaced with newer versions:
  * **Claude models:**
    * `claude-4.0-sonnet` → replaced with `claude-4.6-sonnet`
  * **Gemini models:**
    * `gemini-2.0-flash` → replaced with `gemini-3.0-flash`
    * `gemini-2.0-flash-lite` → replaced with `gemini-3.1-flash-lite`
    * `gemini-2.5-flash` → replaced with `gemini-3.0-flash`
  * These models are no longer available. On 5/25/2026, they will be automatically migrated to their replacements.