I'm a bit unclear why this announcement is so significant, and frankly I'm not even sure I understand it. We already have API access to the text-davinci-003 model, and my understanding is that ChatGPT basically uses the same model with a small amount of incremental tuning.

Is this announcement just saying that this marginally revised model will now be available as a model option through the OpenAI API? If so, what benefit does this provide over the API access using text-davinci-003?