Which? asked ChatGPT, Gemini and Perplexity for the best Black Friday air fryer deals. Only Perplexity found the experts' top pick and a working discount code, but it misquoted the deal price, so Which? suggests AI as a starting point, not the final word.
I'm thinking of buying [PRODUCT AND MODEL] for [PRICE] at [RETAILER]. Using current sources, tell me: the typical price over the last six months, the lowest recent price, other UK retailers selling it now and their prices, and any valid discount codes. Link every price to its source so I can check it.
Replace the [PLACEHOLDERS] with your own details before you send it.
How to try it
- Ask Perplexity (or another tool that cites sources) about one specific model, not ‘the best deals’.
- Click through every price it quotes; Which? found AI tools sometimes got prices wrong.
- Only buy if the price is genuinely good compared with the last few months, sale badge or not.
More shopping use cases
Get a second opinion on glasses frames from Gemini
One user asked Gemini for its opinion while trying on glasses frames, and it helped them pick a pair. Three colleagues complimented the new frames.
I'm choosing new glasses frames. My face shape is [IF YOU KNOW IT], my style is [E.G. SMART, PLAYFUL, MINIMAL] and I'll wear them mostly for [WORK / EVERYDAY]. I'll show you each pair on camera or in photos: tell me honestly which suit me best and why, and which to avoid.
Negotiate a car price with a dealer by text using ChatGPT
One buyer used ChatGPT to negotiate a car price over texts and emails, and found that the usual showroom pressure tactics carry much less weight when you have a calm adviser helping you word every reply.
I'm buying a [YEAR, MAKE, MODEL, TRIM] from a dealer in [TOWN/REGION]. Their quote is [PRICE, INCLUDING ANY FEES]. Similar cars I've found online are listed at [PRICES]. Help me negotiate by email or text: 1) list the questions I should ask about fees, warranty and add-ons, 2) write an opening message asking for their best on-the-road price, 3) suggest how to respond if they push me to come in or 'speak to a manager'.
Find savings in a year of grocery receipts with ChatGPT
One shopper had ChatGPT analyse a year of online grocery orders. It worked out the household could save hundreds a year by switching to equivalent own-brand products and buying specific items from specific shops.
Here is my online grocery order history for the last [PERIOD]: [PASTE OR UPLOAD]. Analyse it and tell me: 1) my top 20 items by total spend, 2) where a cheaper own-brand equivalent exists, 3) which items are cheaper at [OTHER SHOPS], and 4) a realistic estimate of yearly savings. Present it as a short table.
Reference: Which?