I recently discovered you can lose chat history by switching between using Gemma web "app" and at least the Android version.

Simply start chat on web, head to couch and continue on phone, later go back to web and, crucially, do not refresh your browser, but resume chatting.

All that lovely stuff you chatted about on your phone will be gone from the chat...

Android app also loses anything you've typed but not submitted if the app is closed while in background. I guess kinda expected but also annoying if you get interrupted.

I also found Gemini oddly less accurate at web searches, and less willing to do them compared to ChatGPT. Working on an electronics project Gemini relied much more on innate, hence sometimes incorrect knowledge, while ChatGPT 4.5 went and verified datasheets and whatnot much more rigorously.

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