What do the created GPTs models run on?

[kenhachi1222n]

The content is as per the title.
Can the default settings be fixed and not changeable?
Also, in that case, what version is it?

[_j]

What models are my custom GPTs using?

Don’t ask ChatGPT what model it uses. Besides the AI not answering correctly, the GPT instructions could tell the AI it actually runs “Anthropic Claude” and provide you with further misinformation. GPTs will always run gpt-4o now, regardless of the subscription tier. Whether you get a few GPT trials in a free ChatGPT account, or pay for a $200/mo pro subscription, that same gpt-4o model version is used for GPTs. The model cannot be chosen by you. It was an instant switch from the gpt-4-turbo …