Why does tier 2 in the plans and features list this?
"Advanced Native AI models (GPT-4, GPT-4o, Claude 3.5 Sonnet)"

Is there a way to use chatgpt 4o and if yes, will I need to purchase credits?

Sorry, I'm not quite sure of the source of the confusion. ChatGPT 4o is a product from OpenAI that uses the model GPT4o (also called GPT 4 Omni). As such we provide a similar model called Azure GPT-4o which is the same model as OpenAI with the added benefit of more data security provided by hosting our own instance.

You don't need to purchase credit to use our GPT-4o model, only a Tier 2+ license

Advanced Native Al models (Azure GPT-4, GPT-4 Omni, Claude v3 Sonnet)
=> Afforai supports and offers these Al models natively inside Afforai. You can use these models with no limit.
Bring Your Own Key via OpenRouter (GPT, Claude, Sonnet, Gemini, etc)
= You can connect your API key via OpenRouter, allowing you to use other Al models in the market that we dont offer natively.

And the reason why the video recommends not to use BYOK via OpenROuter is because we've already provided all the best AI models you need natively in Afforai, for free, unlimited usage. BYOK via OpenRouter is not within our control so if there's a bug, we can't solve it.