Grok examples: 87 real use cases with prompts

Get a $3,200 overpayment back from the wrong credit card company with replies drafted by Grok

After sending a $3,200 payment to the wrong credit card company, the poster requested a refund and got automated replies saying a check would be mailed within 7 days if approved, though they wanted a digital transfer. They asked Grok how to handle it and it wrote the replies; after several back-and-forths they got the money back.

Replace a car sensor with Grok's help (it pointed the wrong way for 40 minutes)

A driver replacing a sensor to clear a check engine light says Grok led them astray for 40 minutes; they had to use Google to find where the sensor was. Once they found it the job was easy, and the light went off. The poster's conclusion: AI is not good at fixing cars.

Stop water hammer by setting pressure-reducing valves correctly with Grok's help

A licensed plumber says Grok helped them set their Watts LF150A valves properly, finally ending the severe water hammer in their house whenever the washing machine's solenoid shut off.

Plan a Hong Kong trip with Gemini, Grok and ChatGPT (some addresses were made up)

A traveller planned a Hong Kong trip mainly with Gemini, using Grok and ChatGPT as extras, to organise locations, build itineraries, make packing lists and turn store addresses into Google Maps links. The traveller says routes were logical and personalised, but the AIs sometimes produced convincing addresses that didn't exist, and got names, opening hours or whether shops were still open wrong. Next time they'd verify every important detail on maps and official sites.

Help a locked-out Tesla owner get back in with Grok and Tesla support

At a Supercharger, a Tesla driver saw the owner of the car next to them locked out with their wallet and key inside and the charger connected. They asked Grok what to do; it recommended calling customer support, and they say they asked Grok to go ahead and call. After verifying the owner's identity and VIN, Tesla's agent opened the car door.

Make a healthy, spicy dinner from whatever's in the fridge with Grok

Two sisters cooking together open the fridge, give Grok the ingredients and ask it to make the meal healthy, savoury and spicy, using as many vegetables, herbs and seasonings as possible. The poster shared the result, a spaghetti squash with spicy veggie-packed beef sauce and a two-ingredient pineapple coconut sorbet, and says the dinner delivered.

Clear a $1,195 medical bill after a Medicaid-to-Medicare switch with Grok

A poster says Grok helped them fix a $1195 spurious medical bill that arose when the government moved them from Medicaid to Medicare after their SSDI was approved.

Win a lemon-law buyback of a 2025 Hyundai Elantra without a lawyer by following Grok (not Gemini)

A driver whose new 2025 Elantra's head unit failed (no CarPlay, broken navigation and Bluetooth) ran their whole lemon-law fight through Grok. After three dealer visits, the last a refusal to touch the car, Gemini advised waiting before sending the lemon-law letter; Grok said to lock the mileage, film the refusal, mail the letter and file with the state AG the same day, and they followed Grok. When the AG and Hyundai turned them down, Grok pushed them to file with BBB AUTO LINE and wrote a line-by-line rebuttal. They say the arbitrator ordered a repurchase in August and their loan was paid off to $0.00 in September.

Get back to the US without a passport book after being denied boarding, with Grok's plan

Denied a flight back to the US because they only had a passport card, not the book, a traveller asked Grok what to do. The traveller says it suggested taking an Uber to the border, linked them with a private car from the border to the airport, said which security checkpoint to use and calculated the travel time; they missed the first flight but caught the layover after a 4-hour drive.

Get a dead AC condenser running again from photos with Grok

With their upstairs bedroom hitting 90°F, a poster asked Grok how to cool the house and found the outdoor condenser wasn't running. They say Grok walked them step by step through fuses, capacitors, contactors, multimeter use and Nest and furnace control-board wiring from their photos; after hours of near-misses they booked an HVAC visit, but Grok then spotted miswired Nest thermostat and control-board wires. After they fixed the wiring the AC ran, and they cancelled the appointment, estimating they saved $1,000+.

Check a $930 dealership service estimate against warranty documents with Grok

In an interview summary, a truck owner said they'd been quoted $930 at the dealership for spark plug replacement. Before approving it, they uploaded their warranty and maintenance PDFs, the estimate and a screenshot and asked AI, 'Is any of this already covered under my warranty?' It found the work was already included in their prepaid maintenance package, saving $930. The interviewee's own post names Grok as the tool.

Clear a dishwasher error by cleaning the filter and resetting it with Grok

A poster says Google's AI told them a dishwasher error likely meant the machine needed repair or replacement, but Grok told them to check the filter, which was clogged, and gave exact instructions to reset it. It worked perfectly.

Win an airline's reimbursement appeal for a cancellation hotel and meals with Grok's step-by-step help

After a crew time-out cancelled their Miami flight, Chris Bernasconi was told by a gate agent that passengers were entitled to a hotel, transport and a meal, and saved every receipt and the airline's email. Delta declined the reimbursement claim. Bernasconi asked Grok, which spelled out what to do, how to frame the appeal and what to upload, and offered further steps if it failed. Within an hour of appealing, Delta said payment was on the way.

Help a sixth grader learn to factor with Grok and ChatGPT as 'the greatest math teacher'

A parent photographed their daughter's sixth-grade worksheet and asked both Grok and ChatGPT to act as the greatest sixth-grade math teacher and explain to a 12-year-old how to factor each equation using the greatest common factor, with clear steps and ways to check their work. They say both of them now know how to do it, and the daughter did the rest of the worksheet without AI.

Find extra tax refund money with Grok's help

A poster says they asked Grok to help with their taxes and it helped them get around $1,500 more on their tax return, adding that it also helped them learn about taxes they were never taught.

Clear a car's no-start service code caused by a slightly open window with Grok

After leaving the driver's window about 1/4" open for roughly 36 hours, a poster's car wouldn't start and they jump-started it with a portable charger; the service manual pointed them to the dealer. The poster says Grok quickly found there's a dash service code for the driver window and the fix was to roll the window down and back up, which cleared the code and saved a dealer trip.

Fix a dead freezer with a £10 wire after Grok's voice-and-camera mode found a known fault

When a freezer stopped working, Marc Landers gave Grok the make, model and problem. Grok had them turn on voice and camera mode, open the door, remove the top hinge cover (no tools needed) and point the camera at a wire it said was a known fault for that model. Grok gave the price and an Amazon link for the part; the £10 wire arrived next day and took five minutes to replace, instead of paying a repair technician.

Get a faulty demo car replaced under South Africa's Consumer Protection Act with Grok's help

Two days after buying a demo Chery Tiggo 4 Pro, the tyre-pressure monitoring system failed at 120 km/h. The poster (@viking_boer) used South Africa's Consumer Protection Act and Grok's step-by-step advice to reject the car. The dealership resisted, but within two weeks the poster got a brand-new replacement, with the leather seats swapped over.

Compare pet insurance policies and find a promo code with Grok, saving about $1,000 a year

After their golden retriever's insurance rose to $182/month, a dog owner got a $110/month quote elsewhere and uploaded both policies, their disclosure statements and the quote to Grok for a detailed comparison. In 24 seconds it produced a table of key inclusions, which was more comprehensive, benefits and drawbacks of switching, and a recommendation to switch. The owner turned down three retention offers, cancelled, then had Grok search for public promotions and found one that saved a further 20%. They say they got more cover and will save about $1,000 a year, in about 15 minutes.

Trace a Mitsubishi engine light to a £100 oxygen sensor instead of a £2,500 catalytic converter with Grok

After independent garages kept resetting the engine management light and a main dealer quoted £2,500 for a new catalytic converter, Paul Ryan bought a £20 OBD reader, downloaded the data and uploaded it to Grok. Grok said it was the post-cat oxygen sensor, not the converter. A mechanic agreed to replace just the sensor (£100 part, £100 labour) once Ryan signed that it might not fix it. The light stayed off and the sensors read normal; Ryan says it saved £2,000.

Get a wrongly coded medical bill corrected with Grok

After weeks of getting the runaround from both their doctor's office and their insurer, a poster put all the bill information into Grok. They say it found the coding issue and told them how to press it with their doctor, and they avoided a huge medical bill.

Find out a leaking shower cartridge is under lifetime warranty with Grok

A Delta shower installed in 2009 was leaking badly from its cartridge. The poster (@JustAnAvgJoeW) asked Grok, which said the faucet had a lifetime warranty; they ordered the replacement part the same day and planned to fit it themselves after a video, which they estimated would save $400–$500 over a plumber.

Build a month's family meal plan around kids' preferences, three stores and a custody schedule with Grok Projects

Talking rather than typing, the poster behind @reasonablTchDad gave Grok Projects three kids' food preferences, ten to fifteen past meal ideas and who liked which, December school-vacation days, which items are available at which of three stores, and the custody schedule. Grok produced a 'kids working doc' with preference and meal tables, and a December plan with daily meals, a shopping list split by store, holiday snacks and easy lunches for the two weeks the kids are home, plus a Notion-ready version. Both docs stay in the project for next month's plan.

Fix a diesel truck's limp-mode problem part by part over six weeks with Grok and YouTube

After a dealer charged $7,000 for a new catalytic converter and the GMC diesel still went into limp mode while towing an Airstream, Greg Wall spent six weeks talking to Grok and watching YouTube. Grok helped find part numbers, estimate costs and rate the difficulty of each job; Wall replaced the #2 exhaust gas temperature sensor, alternator, #9 fuel injector, intercooler pipe and air intake box, filter and pipe, but couldn't loosen the NOx sensor nut. The couple bought a new truck anyway; on a later 2-hour drive the diesel showed no warnings and set a 21.2 mpg record.