It is GPT 3.5. It's not ChatGPT, though. From https://beta.openai.com/docs/model-index-for-researchers https://beta.openai.com/docs/model-index-for-researchers

It is GPT 3.5. It's not ChatGPT, though. From https://beta.openai.com/docs/model-index-for-researchers https://beta.openai.com/docs/model-index-for-researchers > GPT-3.5 series is a series of models that was trained on a blend of text and code from before Q4 2021. The following models are in the GPT-3.5 series: code-davinci-002 is a base model, so good for pure code-completion tasks text-davinci-002 is an InstructGPT model based on code-davinci-002 text-davinci-003 is an improvement on text-davinci-002