ChatGPT examples: 282 real use cases with prompts

Catch an error in a 4th-grader's textbook answer key, which ChatGPT first got wrong too (failure)

Carlos Mendoza's 4th-grade son marked only B and F as correct in a Santillana exercise on numbers up to the billions. The platform's solution marked B, D and F, but D said '9,615 rounded to the billions is 10,000', which is false. When Mendoza asked ChatGPT to review it, it first said Santillana was right, reading 'billions' as if it were 'thousands'. Only when Mendoza pointed to the exact word did ChatGPT acknowledge the error. The son had been right from the beginning.

Find a cheaper Medicare drug plan with ChatGPT after a premium rise, then confirm it in Medicare's Plan Finder

A Topretirements blogger's Medicare Part D drug plan wrote to say the 2027 premium would rise from $98.30 to $126 a month. They asked ChatGPT for cheaper options, giving their Florida ZIP code, their medications and preferred pharmacies. It suggested several, including a plan at $5.30 a month in their area, $1,448.40 a year less in premiums. They didn't switch on ChatGPT's word alone: as their insurance agent also advised, they checked it in Medicare's official Plan Finder, which confirmed the switch made sense, and enrolled. They get most prescriptions through the VA, so the cheapest premium suited them; they note others need to compare total yearly cost.

Work out why a meeting was missed and set up a tested email-to-calendar check with ChatGPT and Codex

Dave W Plummer missed an important appearance and asked the ChatGPT desktop app, which has access to their Gmail, to work out how it happened. It found Plummer had noon in mind, the time of an earlier prep call, while the event started at 7:50 a.m. Pacific, with emails also mentioning 8:50 a.m. Mountain. When Codex then reconstructed the email trail, it found the organiser had cancelled the calendar invite sent to Plummer's regular address while sorting out a Teams login mismatch, and the later confirmation email had no new invite. With Codex, Plummer then set up a recurring agent that reads email threads, including changes and cancellations, adds missing calendar entries with the source email and link, and flags contradictions. Test alerts at first didn't notify on the iPhone; after checking alarms, sync and Focus settings, a test finally rang. It now checks every ten minutes while the Mac is awake; its first historical review was still running.

Find the exact replacement part for a broken shaver tab from a photo and a voice note to ChatGPT

A small plastic tab broke on Michal Barodkin's Philips shaver after several years. Rather than replace the shaver, they sent ChatGPT a photo of the broken piece and described the problem in a voice message. It found the replacement part, with its Philips part number and a place to order it. It cost six dollars and they picked it up the next day.

Send four AI agents to get real car insurance quotes: Gemini and ChatGPT got none, Claude and Muse got five each

Thy Toeung needed to review their car insurance before their son turned 16. They made a data sheet listing every driver, vehicle and the cover they wanted, and asked Claude, ChatGPT, Gemini and Muse to act as their insurance-shopping agent and get real quotes from six reputable insurers. Gemini's auto-browse explained it couldn't use the websites and handed back a comparison table to fill in. ChatGPT took 2 hours and 279 messages across 12 attempts and got no quotes; Toeung believes sites such as Allstate, Nationwide and Liberty Mutual block AI agents. Claude ran for 3.3 hours and got 5 real quotes. Muse, on its free tier, used several sub-agents and got 5 quotes in about 20 minutes. Toeung switched insurer and got about twice the cover for around 40% of the previous price.

Get a $199 membership refund for slow test results by citing the provider's own agreement with ChatGPT

Gokul N.'s blood test results from Superpower took 20 days. Gokul asked ChatGPT to check the refund policy, look at the dates and email the concierge. The email cited Section 14(a) of the membership agreement, set out the timeline with Superpower's own support replies, asked them to confirm when results had actually been available, and added a fallback asking for an exception if a different policy applied. Two days later Superpower confirmed a full $199 membership refund.

Find out a spouse's Tax ID could be got for free in a minute instead of paying an agent 10k with ChatGPT

Mr Jasper's spouse needed a Tax ID, and the agent they contacted quoted 10k and asked for the spouse's NIN to process it the next day. Mr Jasper asked ChatGPT about it and how long it takes, and found it was something they could do themselves in a few minutes. They opened the official portal with the spouse's NIN and the Tax ID was ready in less than one minute, saving the 10k fee.

Sort 204 unread emails into action labels with ChatGPT, approving every change first

Ary Aranguiz connected ChatGPT to Gmail and asked it to create four labels: ACTION/Reply, ACTION/Decision, ACTION/Review and STATUS/Waiting. ChatGPT then reviewed 204 unread emails from the past seven days and proposed which belonged under each label, separating people waiting for a reply, invitations needing a decision, information to review and routine mail needing no action. It noticed the original label set was incomplete and recommended adding ACTION/Review. Aranguiz approved the proposals, and only then did it create the label and apply the labels. It didn't send, delete, archive, forward or mark anything as read.

Get a 0.75% to 12.75% unemployment insurance rate jump fixed retroactively with ChatGPT filing the missing wage report

mattmaroon runs a seasonal business and noticed their state unemployment insurance rate had jumped from 0.75% to 12.75%. Instead of hours on the state website and on hold, they asked ChatGPT what had happened. It worked out that they were being charged a penalty rate because their new payroll provider doesn't file wage reports for the one quarter with no wages, and without a report the business counted as delinquent. ChatGPT filed the correct wage report and went to the support site to request a retroactive rewrite, which was granted, saving many thousands of dollars without hitting the 5-hour usage limit.

Rebuild a pool's plumbing for about $1k instead of a $6k quote, with ChatGPT drawing a labelled parts diagram

joenot443 was quoted $6k to fix their pool's plumbing and rebuilt it themselves over a few days with YouTube and GPT, for about $1k of materials. It was their first outdoor plumbing job and they'd never touched PVC. They say they wouldn't have had the confidence from YouTube alone: specific diagnostic help and a full diagram made the difference, and they had it prepare an SVG of the whole assembly with every measurement and part labelled.

Compare five homeowner's insurance quotes with ChatGPT and Claude, and learn to check insurers' financial ratings, not BBB

Natasha Hsi got five homeowner's insurance quotes for a complicated house. They differed on exclusions, wind and named-storm deductibles, and admitted versus surplus-lines insurers, and Hsi found them hard to follow. They fed all five plus their current renewal into ChatGPT and Claude and ran scenarios such as a hurricane loss and a total loss. When Hsi suggested starting with BBB ratings, both pushed back: BBB tracks complaints, while financial strength ratings show whether an insurer can pay after a storm. Hsi took the questions back to their original agent, who returned a better-structured quote at a more reasonable cost with none of the weakly rated insurers.

Land a new software job within a month of quitting, using ChatGPT for interview prep plans

Rathesh Prabakar, a senior software engineer in Bengaluru, quit in October 2025 without a job lined up. Prabakar applied before work and prepared after, and asked ChatGPT to act as an experienced résumé writer. For each interview, Prabakar gave it their skills, experience and the job description plus the time available and asked for a prep plan; a high share of the likely questions it suggested came up. Questions Prabakar couldn't answer went back to ChatGPT afterwards, and doubtful answers were cross-checked on Google. With a referral from a LinkedIn contact, Prabakar accepted an offer in early November.

Shortlist cities to move to from the whole family's must-haves with ChatGPT, then visit and choose one

Before moving within Denmark, Vera Termühlen-Enger's family first talked through what each of them needed: school, nature, community, health support, job opportunities, and for their son, a skate park nearby. Only then did they ask ChatGPT to analyse possible cities against those criteria. It suggested 8 places; they crossed 3 off from what they already knew and visited the remaining 5 during the winter holidays, walking around, speaking to schools and talking to people. They chose Odense, a city they hadn't known and probably wouldn't have found without ChatGPT, though the final reasons were the school principal, the atmosphere and the neighbourhood.

Get out-the-door quotes from 25 dealerships at once with a ChatGPT list and message, and pay $7,000 less

Isaiah Crossman, a salesperson, started shopping a few days before the end of the month, when dealers chasing monthly targets are most motivated. After a test drive and a benchmark price from the nearest dealer, Crossman had ChatGPT list the 25 closest dealerships with links to their contact forms and draft one message: driven it, ready to buy, this spec and these colours, send your best out-the-door price. Sending it to all 25 took about 7 minutes. Over about 2 hours of calls across a few days, a general manager 40 minutes away made a same-day deal: $7,000 less than one dealer's earlier offer and $2,100 less than the next lowest.

Check this week's appointments with ChatGPT's calendar access, and get one wrong by 24 hours (failure)

Ali van der Laan found Claude struggled with Google Calendar on an iPhone and switched to ChatGPT for calendar management. Their first question was what they had on that week. ChatGPT gave the wrong time for an appointment, off by 24 hours, and then wrote reams justifying it.

Plan a four-day family trip to London with ChatGPT, then have hotel concierges catch what it got wrong (partial)

Carley Thornell, a working parent, spent a few hours going back and forth with ChatGPT to plan a four-day London trip with their 6-year-old, ending up with a spreadsheet itinerary. On the ground, hotel concierges caught what it missed: a V&A exhibit sold out since day one with no walk-ups, a way into the British Museum's Egypt wing when general tickets were gone, a nut-free restaurant pick (Ping Pong) that had closed the previous year despite a 'permanently closed' flag on Google, and suggested bus routes 11 and 15 that don't go to the Science Museum or Hamleys. A rail strike the week they were there wasn't something ChatGPT could know. Some of its dining picks still worked out for the family.

Revise for a school exam without the textbook by giving ChatGPT the official PDF to answer the exercises

SriSakthi Saravana Prabhu's younger child had a Kannada exam the next day after a week off school with fever, and the textbook was likely left at school. The parent can speak Kannada but can't read or write it, and the exam questions come from the exercises at the end of each lesson. They found the Grade 3 textbook as a PDF on the Karnataka education portal and uploaded it to ChatGPT. Within seconds it gave answers, and the child confirmed they were the ones needed. Some pages came back without answers, but uploading those pages separately filled the gaps.

Win a rent tribunal complaint over a move-out repainting bill with ChatGPT structuring the evidence

After moving out of a rental flat in Denmark after one year, Andreas Strandfelt was billed a surprisingly high amount for repainting, despite detailed move-in documentation, a thorough move-out inspection and evidence that an identical neighbouring flat had been painted more for less that month. The landlord wouldn't explain the costs. Strandfelt used ChatGPT to structure a complaint to the local rent tribunal, referencing the email thread, the move-in and move-out reports and the relevant legal paragraphs. The tribunal ruled in their favour, and the landlord had to return more of the deposit. The costs were 300 DKK to file and less than 200 DKK for a month of ChatGPT Plus.

Fight a private parking charge with ChatGPT finding holes in the operator's evidence, then recover £462.15 in costs

Loren Cole, a freelance chef, got a £60 parking charge for overstaying by five minutes at a retail park, despite paying for a three-hour ticket after the payment machines played up. When the operator threatened court, Cole used ChatGPT to scrutinise its letters and evidence: it pointed out claims of non-payment despite a successful card payment, a floor plan sent instead of photos of the signs, and missing detail on entry and exit times against the 10-minute grace period, and it drafted replies. Cole added photos showing the signage didn't match the floor plan, and the operator discontinued the claim. Cole then used ChatGPT to claim litigant-in-person costs at £19 per hour; after a default costs certificate and a ChatGPT-drafted final warning, the operator paid £462.15.

Plan a nut-free family Christmas dinner that bakes in one oven at one temperature with ChatGPT

Stephanie M. Morrison was hosting family and asked ChatGPT for a menu with a list of criteria: easy, with some store-bought items and a few simple homemade dishes; dishes that could bake at the same time and temperature in a single oven; no nuts, red meat or anything spicy; traditional enough for a crowd; and something picky kids would try. From several options, Morrison chose roasted orange and cranberry chicken with roasted red potatoes with garlic and parmesan, plus store-bought rolls, salad and dessert. ChatGPT said what to start when so everything finished together, and gave a shopping list. It took 5 minutes, and Morrison says it worked perfectly and was a hit.

Pick a family health plan at open enrollment from photos of the benefits booklet with ChatGPT, then cross-check the numbers

Chris L.'s family spent about $19k on healthcare in a year that wasn't especially bad health-wise, because they'd hit the out-of-pocket maximum on a plan that didn't fit their needs. During open enrollment they photographed the pricing and coverage pages of the enrollment booklet and gave them to ChatGPT, with the care they expected. After 5 and a half minutes it compared the PPO, Gold and Bronze plans, explained how an FSA and an HSA would work out, and gave best- and worst-case yearly costs for each. They then asked about the costs in between those two extremes and got another detailed answer. They checked the output with two other models, which gave the same numbers, and expect to pay between $2,600 and $16,500 in 2026, saving at least $2,500 compared with the year before. It took them under 20 minutes.

Build a custom GPT as a job-search coach and go from 2 or 3 interviews to at least 7 and a PayPal offer

Product manager Amar Saurabh, ex-Meta and TikTok, got only two or three interviews in the first two months of applying, and plain ChatGPT kept giving generic answers and asking for the résumé again. In about an hour and a half Saurabh built a custom GPT, 'PM job search advisor', loaded with their résumé, LinkedIn profile and project details. It drafted recruiter outreach (including 300-character connection requests), tailored the résumé to each job description and prepped each interview. Over two months Saurabh landed at least 7 interviews, with companies including Reddit, Intuit and PayPal, and took a lead product manager job at PayPal.

Hunt for a $400 mixed-metal bracelet on Etsy with ChatGPT Instant Checkout and end with an empty cart (failure)

Business Insider's Jordan Hart tried ChatGPT's new Instant Checkout to find their mom a birthday bracelet in sterling silver and gold, with a $400 budget, starting on Etsy. ChatGPT listed seven Etsy options, but with links rather than a buy button, and one was a $2,400 cuff. Asked to show only items it could sell in the chat, it said it couldn't reliably tell from the product data which were eligible, and Skims and Glossier weren't live yet either. Searching other retailers, it found bracelets from brands such as Kendra Scott and Mejuri that fit the brief, though it had to be asked again for direct links. They didn't love any of them and ended with an empty cart.

Compare two contractor quotes for a driveway and retaining wall with ChatGPT and catch the missing drainage

Jeffrey Trull had two quotes for a driveway extension and retaining wall worth a few thousand dollars, from contractors they'd never used. One was $500 cheaper. They fed both into ChatGPT, which took 5 minutes. It flagged that the cheaper quote didn't mention drainage or backfill, and explained that water building up behind a retaining wall can make it fail; the dearer quote included a full drainage system with stone backfill. It also set out the trade-off between the nicer interlocking blocks and basic cement blocks, and wrote follow-up questions for each contractor, since one quote gave no wall dimensions and the other didn't explain ground prep. Trull planned to take those questions back to both contractors, and to ask the cheaper one to add drainage and backfill, before signing anything.