GPT-5

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Alex Goldberg

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Aug 9, 2025, 10:00:09 PMAug 9
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Hello Rajat,

I can't use GPT-5 with any of the templates. I get error 400. Can you please help me to verify if something has changed or is missing?

Thanks a lot.

Rajat Paharia

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Aug 9, 2025, 10:27:45 PMAug 9
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Hi Alex - 

I just added a GPT-5 template - give it a try. The issue was that the other OpenAI templates included a "temperature" argument in the body, which the GPT-5 model doesn't accept. 

Just fyi, there are several GPT-5 models, and only GPT-5-chat supports a "temperature" argument.

I copied the following from this discussion thread: https://community.openai.com/t/temperature-in-gpt-5-models/1337133/17

- rajat

GPT-5: not supported :cross_mark:

GPT-5-chat: supported :white_check_mark:

GPT-5-mini: not supported :cross_mark:

GPT-5-nano: not supported :cross_mark:

Alex Goldberg

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Aug 9, 2025, 11:14:16 PMAug 9
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Perfect,

Thanks, I'm testing with the new template and just pasting my API key but I still get error 400. Any idea on what can be happening? I have checked my OpenAI account, and GPT-5 is already activated for me. I can use the model in other clients.

Thank you very much!

Rajat Paharia

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Aug 9, 2025, 11:20:18 PMAug 9
to Alex Goldberg, Ask Steve User Community
Can you paste the body of your configuration here? I tested it and didn't have any issues. I was using Chrome, are you using a different browser? 

- rajat

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Alex Goldberg

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Aug 12, 2025, 9:21:39 PMAug 12
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Hello,

This is the body:

{
  "input": "[[PROMPT]]",
  "model": "gpt-5",
  "stream": true
}

I'm using Vivaldi right now. My other models work fine.

Thank you very much.

Alex Goldberg

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Aug 12, 2025, 9:21:41 PMAug 12
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{
  "input": "[[PROMPT]]",
  "model": "gpt-5",
  "stream": true
}

I'm just selecting the template and adding my API key.

Thank you very much!

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