@merefield plugin has been around for longer and has many more knobs to configure it. AI Bot is also a bit more ambitious (especially since we have GPT 4 access) in that we attempt to integrate it into the Discourse experience - it knows how to search and summarize topics , for example.
Notable differences as of today are probably
- We stream replies and offer a stop button
- @merefield offers a lot more settings to tune stuff
- We offer a “command” framework for getting the bot to act on your behalf - albeit experience is fairly flaky on GPT 3.5
- @merefield offers discourse chat integration atm, we do not yet
- We offer anthropic integration as well