GPT-3.5-turbo models, including the newest preview, have not been retrained yet on new knowledge up to 2023 like gpt-4-turbo, an advancement of knowledge date which was announced November 6.
https://platform.openai.com/docs/models/gpt-3-5
If previews and trials of a newer AI model were done in a less public manner (as might have been seen in the limited “GPT-4 alpha” some free ChatGPT users got to experience), ChatGPT might be the place for certain users to see it before it is broadly available.
Right now, ChatGPT 3.5 is programmed with “Knowledge cutoff: 2022-01-01” as part of the system message.