What model is ChatGPT Plus using?

By using API, I can access all the GPT4 models. Which one is being used in GPT Plus? And what is its context length?

ChatGPT+ is using GPT-4-Turbo and has a context length of 32,000.

The language model most likely being used in ChatGPT is probably the gpt-4-turbo-preview (and vision).

In GPT Plus, it would be reasonable to assume that they are truncating the 128K context of gpt4-turbo-preview to a 32K context for use.