I use the free Gemini a lot for personal use.
Helped me diagnose why my chain was coming off the sprocket on my grain drill and repair it. Turns out the previous owner had put a #40 chain on it instead of #41 and that extra side to side play was helping it come off. I would have never thought to check on that.
It's helped me dial in my spray formulations and speed I need to drive for spraying weeds in my fields, planting rates on my cover crop for my CRP. Helped me sort through converting a variable life insurance policy to a long term care annuity for my wife (I would have never thought that was a possibility, I just whined to it about how sucky my variable life insurance policy was and asked it to help me brainstorm on what I could do with it and between us we came up with the long term care annuity for my wife since she has Parkinsons and is going to need long term care).
It really does a great job on helping me prepare to teach adult bible class. Helping me design and plan my sea container cabin. Just helped me negotiate a deal with Discount tire for some new tires, helped me source replacement parts for my Brinkmann gas grill that has been bankrupt for 10+ years, helped me sort through some decisions on my new property on stand placement based on predominant wind directions in early October, it goes on and on.
I was going to move some stocks from Fidelity to Robinhood to take advantage of Robinhoods very low margin interest rate and it told me I should negotiate the margin interest rate with Fidelity instead and Fidelity dropped my margin interest rate from 10.625% to 5.5% so that's what I'm using to buy another 40 acres adjoining my land in Colorado instead of having to go get a loan that would require an appraisal, survey, etc. and saved me probably $2,000 minimum in closing costs and has a better interest rate also. It's helping me work on my Colorado State Forestry Plan so I can get my agriculture exemption on my property taxes there. I essentially treat it as a very smart friend who really knows a lot about everything. It's way better than using YouTube videos to figure stuff out, it does a better job of sorting through the stupid stuff.
It can still make blatant mistakes, you have to know at least a little bit about what you are asking it about to know if it is full of crap or not but it has saved me a LOT of money just in the last few months.
At work we are testing all the paid versions, right now we have CoPilot, ChatGPT, Claude, Gemini and Codex. Most are on CoPilot because it is cheap and does okay. Our best tech users are all infatuated with Claude and really swear by it although they cuss running out of tokens all the time even on the $100 per month version. I think it is going to really change things and make us more efficient.
I should have used it to help me type this up a little more organized because it was a bit of a wreck and I had to edit it 3 times.