> ## 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.

# GPT Realtime model replacements

> On 01/19/2027, Retell replaces GPT Realtime and GPT Realtime mini with gpt-realtime-2.1 and gpt-realtime-2.1-mini. Existing configurations will be automatically migrated.

* The following speech-to-speech models are being deprecated and replaced with newer versions:
  * **OpenAI Realtime models:**
    * `gpt-realtime` → replaced with `gpt-realtime-2.1`
    * `gpt-realtime-mini` → replaced with `gpt-realtime-2.1-mini`
  * On 01/19/2027, existing configurations will be automatically migrated to the replacement model.


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