Revert "update model version #"

This reverts commit 2c1e9a8.

Author: PatrickFarley

articles/ai-services/openai/concepts/model-router.md

@@ -46,7 +46,7 @@ The responses API is currently available in the following regions:
 - `gpt-4.1` (Version: `2025-04-14`)
 - `gpt-4.1-nano` (Version: `2025-04-14`)
 - `gpt-4.1-mini` (Version: `2025-04-14`)
-- `gpt-image-1` (Version: `2025-04-01-preview`)
+- `gpt-image-1` (Version: `2025-04-15`)
 
 Not every model is available in the regions supported by the responses API. Check the [models page](../concepts/models.md) for model region availability.
 

articles/ai-services/openai/how-to/responses.md

@@ -23,7 +23,7 @@ This article provides a summary of the latest releases and major documentation u
 
 ### GPT-image-1 limited access release
 
-GPT-image-1 (2025-04-01-preview) is the latest image generation model from Azure OpenAI. It features major improvements over DALL-E, including:
+GPT-image-1 (2025-04-15) is the latest image generation model from Azure OpenAI. It features major improvements over DALL-E, including:
 - It's better at responding to precise instructions.
 - It reliably renders text.
 - It accept images as input, which allows the new capabilities of image editing and inpainting.