Not all Openai models in dropdown and are different than api

[alphaDev23]

Why is there a difference in the models that appear in the dropdown vs. those than those that are obtained via GET https://api.openai.com/v1/models? For example, the dropdown shows only 'GPT-3.5' and GPT3.5-16k' while the api provides:

  "id": "gpt-3.5-turbo-16k-0613",
  "id": "gpt-3.5-turbo-0301",
  "id": "gpt-3.5-turbo-16k",
  "id": "gpt-3.5-turbo-0613",
  "id": "gpt-3.5-turbo",

plus additional models outside the GPT-3 family. Also, I'm not sure which model 'GPT-3.5' and 'GPT-3.5-16k' are specifically referencing.