I’ve been developing an application using either 4o or 4.5-preview (for different tasks). I couple of weeks ago I was using 4.5 quite heavily (spent over a hundred dollars in API costs), but now the exact same code is triggering this error: Error code: 404 - {'error': {'message': 'The model `gpt-4.…

Welcome to the developer forum @Karen_McNeil On the API, gpt-4.5 was in research preview and was set to be phased out by July 14.

Ah, I see! It’s still listed on their Prices page so I didn’t realise that it have been phased out. Do you know if it’s going to be offered as a production model? I think, for me, I’ve solved my problem. I had been using 4.5 as a fallback when 4o gave several refusals in a row (“I’m sorry, I can’t …

Yep [image] GPT-4.5-preview model will be removed from the API on 2025-07-14 Deprecations In my benchmarks 4.1 is better than 4o which is great for most applications, but far from 4.5-preview. I guess size matters A big shame because it is an excellent model, if rath…

The answer: OpenAI announced they would shut off the model GPT-4.5 on API in the same breath as introducing GPT-4.1 in April. OpenAI sent multiple emails to anyone who had made calls to GPT-4.5 in the 30-day lead up to the shutoff date. It has been turned off for over two weeks.

Suddenly don't have access to GPT-4.5 API: Error code: 404 - {'error': {'message': 'The model `gpt-4.5-preview` does not exist or you do not have access to it.',

API Bugs

merefield August 6, 2025, 2:04pm 5

Yep

A big shame because it is an excellent model, if rather pricey!

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The model gpt-4o does not exist or you do not have access to it API	2	716	September 16, 2024
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Not able to access GPT-4 via API API gpt-4 , api	17	5989	August 1, 2023
API returning 404 model not found all of a sudden. Why and how to fix? Bugs gpt-4 , chatgpt	1	2779	March 29, 2026

Suddenly don't have access to GPT-4.5 API: Error code: 404 - {'error': {'message': 'The model `gpt-4.5-preview` does not exist or you do not have access to it.',

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