How to verify model?

[csss1234]

I paid the $5.

When I ask https://chat.openai.com/?model=gpt-4 what version LLM it is, it consistently responds "As an AI developed by OpenAI, I'm a part of the GPT-4 model..."

When I ask "GPT4" at https://nat.dev/, it always answers that it is GPT 3.5