I bought the Tier4 Licence since I once in a while need to use GPT5 Pro for help with mathematical proofs and some advanced mathematics.

I intentionally selected GPT5 Pro. However, it is clear the access is not to the real GPT5 Pro. I don't know what models the output is coming from, but it seems to be coming from some "watered down" non-reasoning model. It can't even solve simple mathematical proofs or problems, and the response mixes between mathjax and unicode mathematics.

I have access to the actual GPT-5Pro from OpenAI, and I have never ever encountered GPT5 Pro doing this kind of stuff. I asked the model itself on writingmate.ai whether it was GPT5 Pro, and it responded it was an assistant named openai/gpt5. But that is not the same thing as the pro model! My sense after doing testing is the models may be low-tier model which are just instructed/pre-ptromted heavily to respond that they are really GPT5.

This was literally my first 2 prompts to the model, so I have definitely not used up any quota for access to Pro models.

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Reply to Founder:
Yes I can select GPT5-Pro and it is also listed as a model that your plan supports here: https://writingmate.ai/models/category/text
The fact that it is listed and I am able to select it, and getting some other low-quality model raises some serious red flags for me.