404 error when trying to access chatGPT 16K

I’m getting a 404 Not found error when trying to access the 16K context version of chatGPT, I can use it in the playground with no issue but the API goes straight to a 404. All the other models seem to work, including GPT4 with the 32K context

Can you please include a code snippet to show how you connect to the API and how any variable are setup?