What's the GPT-4-Turbo encoding?

Which encoder does the GPT-4-Turbo family use for tokenization? In specific I am interested in the correct encoder of gpt-4-1106-preview. It seems to be cl100k_base, the same as for GPT-4, but I can’t find it documented anywhere.
Help would be greatly appreciated.

Hi,

It makes use of CL100K_Base for the encoder.

Thanks Foxabilo,
do you have a source by any chance?

image