update model version #

Author: PatrickFarley

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

@@ -0,0 +1,52 @@
+---
+title: Azure OpenAI model router (preview) concepts
+titleSuffix: Azure OpenAI
+description: Learn about the model router feature in Azure OpenAI Service.
+author: PatrickFarley
+ms.author: pafarley
+ms.service: azure-ai-openai
+ms.topic: conceptual 
+ms.date: 04/17/2025
+ms.custom: 
+manager: nitinme
+---
+
+# Azure OpenAI model router (preview)
+
+Azure OpenAI model router is a deployable AI chat model that is trained to select the best large language model (LLM) to respond to a given prompt in real time. By evaluating factors like query complexity, cost, and performance, it intelligently routes requests to the most suitable model. 
+
+## Why use model router?
+
+Model router intelligently selects the best underlying model for a given prompt to optimize costs while maintaining quality. Smaller and cheaper models are used when they're sufficient for the task, but larger and more expensive models are available for more complex tasks. Also, reasoning models are available for tasks that require complex reasoning, and non-reasoning models are used otherwise. Model router provides a single chat experience that combines the best features from all of the underlying chat models.
+
+## Versioning 
+
+Each version of model router is associated with a specific set of underlying models and their versions. This set is fixed—only newer versions of model router can expose new underlying models.
+
+If you select **Auto-update** at the deployment step (see [Manage models](/azure/ai-services/openai/how-to/working-with-models?tabs=powershell#model-updates)), then your model router model automatically updates when new versions become available. When that happens, the set of underlying models also changes, which could affect the overall performance of the model and costs.
+
+## Underlying models
+
+|Model router version|Underlying models (version)|
+|---|---|
+|`2025-04-01-preview`|GPT-4.1 (`2025-04-14`)</br>GPT-4.1-mini (`2025-04-14`)</br>GPT-4.1-nano (`2025-04-14`) </br>o4-mini (`2025-04-16`) |
+
+
+## Limitations
+
+See quotas and limits
+
+Model router doesn't process input images or audio.
+
+Global Standard region support.
+
+## Billing information
+
+When you use Azure OpenAI model router, you're only billed for the use of the underlying models as they're recruited to respond to prompts. The model router itself doesn't incur any extra charges.
+
+You can monitor the overall costs of your model router deployment in the Azure portal. TBD
+
+## Next step
+
+> [!DIV class="nextstepaction"]
+> [How to use model router](../how-to/model-router.md)

articles/ai-services/openai/how-to/responses.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: `2025-04-15`)
+- `gpt-image-1` (Version: `2025-04-01-preview`)
 
 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/whats-new.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 (2025-04-15) is the latest image generation model from Azure OpenAI. It features major improvements over DALL-E, including:
+GPT-image-1 (2025-04-01-preview) 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.