[lordswork]

I believe it went something like:

    2017: Transformers invented
    2018: BERT
    2020: Meena
    2021: LaMDa -> First model Bard was built on
    2022: PaLM
    2023: PaLM2
    Late 2023: Gemini

It probably would have been clearer if they used simple numerical versioning like OpenAI's GPT-{2,3,3.5,3}. I suppose the idea is to do that with Gemini now.

More info here: https://en.wikipedia.org/wiki/Gemini_(chatbot)