audio models for AOAI

Author: eric-urban

articles/ai-services/openai/whats-new.md

@@ -19,6 +19,18 @@ recommendations: false
 
 This article provides a summary of the latest releases and major documentation updates for Azure OpenAI Service.
 
+## April 2025
+
+### gpt-4o audio models released
+
+New audio models powered by GPT-4o are now available.  
+
+- The `gpt-4o-transcribe` and `gpt-4o-mini-transcribe` speech to text models are released. Use these models via the `/audio` and `/realtime` APIs.  
+
+- The `gpt-4o-mini-tts` text to speech model is released. Use the `gpt-4o-mini-tts` model for text to speech generation via the `/audio` API.
+
+For more information about available models, see the [models and versions documentation](./concepts/models.md#audio-api-models).
+
 ## March 2025
 
 ### Responses API & computer-use-preview model