Google Gemini

Gemini is Google's competitor to ChatGPT from OpenAI. It is independently developed, but is shares many architectural similarities - it is a generative AI that uses a Large Language Model (LLM).

Google claims that Gemini is a state of the art standalone AI capability, but its real strengths are in the way it has been tightly integrated into other Google offerings.

For example:

• If you search on google, the top of the search results will now feature an AI generated concise article on the topic you queried.
• When you receive an email via GMail, Gemini will offer to draft a reply (this is a dangerous thing to trust).
• Gemini will offer to summarise long emails and/or documents written using Google documents.
• etc. 

Gemini has a freemium model which means that the technology is available for light usage for free, but a subscription fee of about $20 per month must be paid for heavy usage.The usage limits of the free tier are outlined here. Developers need to buy tokens which allow a certain level of activity - the detail is described here.