New mode GPT-4o available

[chowhi123]

https://openai.com/index/hello-gpt-4o/

Hi,
New model GPT-4o launched that is suppose to be cheapers faster and higher rate limited than turbo. Can we have this?!

[jarodsmk]

Hey @chowhi123!

I do already have a PR up for this here. Also chatting about it on #108