I think that ChatGPT is not exactly part of OpenAI because its Transformer architecture comes from Google, so it is said that ChatGPT has a kind of inherited relationship with Google.

The Transformer architecture was proposed by researchers at Google and was described in detail in a 2017 paper. This architecture performs well in natural language processing tasks.

The OpenAI team improved and optimized on the Transformer architecture proposed by Google and developed the GPT family of models, which includes ChatGPT.

Obviously, the ChatGPT model is developed by OpenAI and built on top of the GPT (Generative Pre-trained Transformer) architecture, which is the result of the OpenAI team's improvement and optimization on the Transformer architecture for generating natural language text.

Therefore, it can be said that the ChatGPT model is the product of OpenAI's development based on the Transformer architecture proposed by Google. chatGPT somehow inherits the ideas of the Transformer architecture proposed by Google, and extends and applies them to achieve more powerful conversation generation capabilities.

Google's contribution brings important innovations to the field of natural language processing, while OpenAI makes further research and development based on it, driving the development of language generation technology.

In summary, the Transformer architecture was proposed by Google, and the ChatGPT model is a language model developed by OpenAI on top of that architecture. Both entities play an important role in the field of natural language processing and have contributed to the development of related technologies.

In a sense, whether Google likes it or not, what I see is a handover ceremony between the old and the new era done in an invisible way.