@buptle-admin Welcome to Microsoft Q&A Forum, Thank you for posting your query here!
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I see that you have got access to Azure Open AI service however, you are not able to see GPT-4 models in OpenAI Studio at Japan East.
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A separate application for Azure OpenAI GPT-4 is no longer needed.
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Since you have already applied to the Azure OpenAI Service and your request is approved for the Azure OpenAI Service, you will have access to GPT-4 in a few selective regions only. See below screenshot:
GPT-4 and GPT-4-32k are now available to all Azure OpenAI Service customers. Availability varies by region.
As mentioned in our docs for Japan East, Due to high demand, availability is limited in the region.
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So, If you don't see GPT-4 in your region, please check back later. Alternatively, as a workaround, check if you can deploy resource to some other region which is mentioned above and check if that helps. More Info here.
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If you have any follow-up questions, please let me know. I would be happy to answer.
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