ChatGPT vs DeepSeek: we tested both on 8 everyday tasks
Letters, a confusing insurance letter, a scam email, dinner, a trip and a bedtime story. We gave GPT 5.5 (the model family behind ChatGPT) and DeepSeek V4 Pro exactly the same words and show you what each one wrote.
By chatmodel team Tested with OpenAI GPT 5.5 and DeepSeek V4 Pro Updated
The short answer
It's very close: DeepSeek won 3 of our 8 everyday tests, ChatGPT won 2 and 3 were ties, and both got every fact right. Pick DeepSeek for practical answers with an extra useful detail, like a deadline or a safe cooking temperature. Pick ChatGPT for stories and cards, for quicker answers, and when you need recent information.
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GPT 5.5: 2 wins
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DeepSeek V4 Pro: 3 wins
- 3 ties
Pick GPT 5.5 if…
- You want a bedtime story or a card that feels made for the person you're writing to.
- Your question needs recent information: in chatmodel, GPT 5.5 can search the web.
Pick DeepSeek V4 Pro if…
- You want a short, practical answer with a useful extra, like a reply deadline or a rule of thumb.
- You don't mind waiting a little longer for the answer.
Opens chatmodel with both ready: type a question and they answer next to each other. How it works
GPT 5.5 vs DeepSeek V4 Pro at a glance
| | | |
|---|---|---|
| Made by | OpenAI (the makers of ChatGPT) | DeepSeek |
| Best at, in our test | Stories and plans that feel personal | Practical answers with a useful extra detail |
| Weakest at, in our test | Can feel a little plain and brief | Slower: about 16 seconds an answer, against 10 |
| Rounds won (of 8) | 2 (+3 ties) | 3 (+3 ties) |
| Average answer length | About 182 words | About 192 words |
| Average time to answer | About 10 seconds | About 16 seconds |
| Understands photos | Yes | Yes |
| Reads PDFs and files | Yes | Yes |
| Searches the web in chatmodel | Yes | No |
| Knows about things up to | December 2025 | May 2025 |
| On chatmodel | Included in Pro | Included in Pro |
The 8 tests, with both real answers
Same words to both, one try each, nothing edited. Press “Ask it yourself” to run any test in chatmodel.
Test 1 · A condolence card
A condolence card: ChatGPT, by a nose
What we asked
Help me write a short condolence card for my neighbor, whose husband passed away last week. We weren't very close, but he always waved to me in the mornings. I want it to feel warm and sincere, not formal. Keep it under 70 words.
Dear [Neighbor’s Name],
I’m so sorry for your loss. I always appreciated your husband’s friendly wave in the mornings—it was a small kindness that made the day brighter. Please know I’m thinking of you and wishing you comfort in the days ahead.
With sympathy,
[Your Name]
Dear [Neighbor’s Name],
I was so sorry to hear about your husband. We didn’t know each other well, but I’ll always remember his friendly wave each morning—it was a small kindness that meant a lot. Thinking of you and wishing you comfort in the days ahead.
With sympathy,
[Your Name]
Winner: GPT 5.5. Both cards were short, used the morning wave and were almost the same. The difference is one line: DeepSeek wrote “We didn't know each other well” on the card itself, which is true but not something you need to tell a grieving neighbor. ChatGPT's was ready to send as it was.
Test 2 · Understanding a confusing letter
A confusing insurance letter: a tie
What we asked
I got this letter from my health insurance and I don't understand it. Explain in plain words what it means and what I should do next. "Dear Member, We have reviewed the claim submitted by Riverside Imaging for services rendered on 08/14. The claim has been processed and the allowed amount of $412.00 has been applied to your annual deductible. Your remaining deductible for the plan year is $588.00. This is not a bill. You may receive a statement from your provider for the amount you owe. If you disagree with this decision, you have 180 days to file an appeal."
This letter is saying:
- Riverside Imaging sent a claim to your insurance for services you had on 08/14.
- Your insurance reviewed it and decided the approved/negotiated cost is $412.00.
- Because you haven’t met your yearly deductible yet, that $412.00 is your responsibility and was counted toward your deductible.
- You now have $588.00 left to pay toward your deductible before your insurance starts paying more according to your plan.
- This letter is not a bill. It’s an explanation of how the insurance processed the claim.
- You may later get a bill from Riverside Imaging asking you to pay the $412.00.
- If you think the insurance handled it incorrectly, you have 180 days to file an appeal.
What you should do next:
- Wait for a bill from Riverside Imaging before paying, unless you already received one.
- If you get a bill, make sure it matches the insurance amount: $412.00.
- If Riverside bills you for more than $412.00, call your insurance company and/or Riverside Imaging to ask why.
- If you don’t understand why it went to your deductible, call your insurance and ask:
“Can you explain why this claim was applied to my deductible and whether $412 is the amount I owe?” - If you believe the claim should have been covered differently, ask the insurance company how to file an appeal within the 180-day deadline.
This is an Explanation of Benefits from your insurance. It is not a bill.
What it means in plain words:
- You had imaging done at Riverside Imaging on 8/14.
- Your insurance reviewed the claim.
- They approved a price of $412.00 for that service. That’s called the “allowed amount.”
- Because your plan has a deductible, the insurance did not pay the $412. Instead, that $412 was applied toward your deductible.
- You still have $588.00 left to pay out of pocket before your insurance starts paying for covered services.
What this means for your money:
You will likely get a bill from Riverside Imaging for about $412.00, unless you already paid something at the appointment.
The insurance company is not billing you. The provider probably will.
What you should do next:
- Do not pay this letter. It is not a bill.
- Wait for a bill from Riverside Imaging.
- When the provider bill arrives, check that it matches around $412.00.
- If it is much higher, call the provider or your insurance to ask why.
- If Riverside Imaging is in-network, they usually cannot charge more than the allowed amount.
- If the amount looks correct, pay the provider directly.
- Keep this letter for your records.
If you disagree:
If you think the insurance should have paid or processed the claim incorrectly, you have 180 days to file an appeal. Call the customer service number on your insurance card and say you want to appeal the claim decision.
In short: You owe about $412 to the imaging provider, not to the insurance company. Wait for the provider’s bill, check it, and pay if it’s correct.
A tie. Both got it right: this is not a bill, and you'll probably owe $412. ChatGPT gave you a sentence to read out if you call the insurer. DeepSeek added that you might owe less if you already paid something at the appointment, and ended with a one-line summary.
Test 3 · Spotting a scam
Spotting a scam: a tie
What we asked
Is this email a scam? What should I do? "USPS: Your package could not be delivered due to an incomplete address. To avoid return to sender, please confirm your details and pay the $1.99 redelivery fee within 24 hours: usps-redelivery-help.com/track"
Yes — this is very likely a scam/phishing message.
Red flags:
- USPS generally does not ask for a small “redelivery fee” by text/email through random links.
- The link is not an official USPS domain. Official USPS sites use usps.com.
- It creates urgency: “within 24 hours.”
- It asks you to confirm personal details and pay, likely to steal your information or card number.
What you should do:
- Do not click the link and do not enter any information.
- If you already clicked but didn’t enter anything, close the page.
- If you entered card details, contact your bank/card issuer immediately, report possible fraud, and request a replacement card if needed.
- If you entered passwords or personal information, change affected passwords and watch for identity-theft attempts.
- Check package status only by going directly to https://www.usps.com/ or using the official USPS app and entering a real tracking number.
- Report it:
- Forward suspicious USPS-related messages to spam@uspis.gov
- You can also report phishing to the FTC at reportfraud.ftc.gov
- Delete the message and mark it as spam/phishing.
Yes — this is a scam / phishing email. The link is not an official USPS domain, and the small “$1.99 redelivery fee” is a common trick to steal credit/debit card details.
What you should do:
- Do not click the link and do not reply.
- Do not enter any personal or payment information.
- If you’re expecting a package, go directly to USPS.com or use the official USPS app and enter your tracking number there.
- Report the scam:
- Forward the email to spam@uspis.gov.
- Mark it as phishing/junk in your email app.
- Then delete it.
- If you already clicked and entered card/personal info:
- Contact your bank or card issuer immediately.
- Watch for unauthorized charges.
- Change passwords if you gave any account info.
In short: treat it as phishing, don’t engage, and only use official USPS channels.
A tie. Both said clearly it's a scam, gave the right address to report it (spam@uspis.gov) and told you what to do if you already typed in your card. ChatGPT also mentioned reporting it to the FTC; DeepSeek's was shorter and just as correct.
Test 4 · A firm but polite complaint
A complaint to an airline: DeepSeek is firmer
What we asked
Write a firm but polite email to an airline. My suitcase was lost on my flight five days ago, I filed a report at the airport (reference LX-48213), and nobody has contacted me since. I want an update and to know how to claim for the things I had to buy. Keep it short.
Subject: Lost Baggage Update Requested – Ref. LX-48213
Dear Customer Service,
I am writing regarding my suitcase, which was lost on my flight five days ago. I filed a report at the airport under reference LX-48213, but I have not received any update since.
Please provide an update on the status of my baggage as soon as possible. I would also like information on how to claim reimbursement for essential items I have had to purchase while waiting for my suitcase.
I look forward to your prompt response.
Kind regards,
[Your Name]
Subject: Update on lost baggage – Reference LX-48213
Dear Baggage Claims Department,
I am writing regarding my suitcase, which was lost on my flight five days ago. I filed a report at the airport under reference LX-48213, but I have not received any update since.
Please provide the current status of my baggage and let me know how to submit a claim for essential items I had to purchase due to the delay. I would appreciate a response within 48 hours.
Thank you for your attention to this matter.
Sincerely, [Your Name] [Your Contact Information]
Winner: DeepSeek V4 Pro. Both wrote a short, polite email with the reference number and both requests, about 90 words each. DeepSeek added one line that makes it firmer without being rude: “I would appreciate a response within 48 hours.”
Test 5 · Dinner from what's in the fridge
Dinner from what's in the fridge: DeepSeek, for the extra care
What we asked
I have 4 chicken thighs, some potatoes, 3 carrots, half an onion and a lemon. Suggest one easy dinner for four that takes under 45 minutes, with short numbered steps.
Easy Lemon Chicken Thighs with Potatoes & Carrots
Serves 4 • About 40–45 minutes
Preheat oven to 425°F / 220°C. Line a baking tray if you like.
Prep vegetables: Cut potatoes into small chunks, carrots into sticks or coins, and slice the half onion.
Season everything: On the tray, toss potatoes, carrots, and onion with oil, salt, pepper, and any herbs/spices you have. Add the chicken thighs and season them too.
Add lemon: Squeeze half the lemon over everything, then slice the other half and place slices on or around the chicken.
Roast: Bake for 35–40 minutes, until the chicken is cooked through and the potatoes are tender. If the chicken skin needs crisping, broil/grill for the last 2–3 minutes.
Serve: Rest for 5 minutes, then serve one thigh per person with the roasted vegetables.
Sheet-Pan Lemon Chicken Thighs with Potatoes & Carrots
Serves 4 | Prep 10 min | Cook 30–35 min
- Preheat oven to 425°F (220°C). Line a large sheet pan with parchment or foil.
- Cut potatoes into 1-inch chunks. Peel and cut carrots into thick coins or sticks. Cut onion into wedges.
- Toss potatoes, carrots, and onion with 2 tbsp oil, salt, and pepper. Spread on the sheet pan.
- Pat chicken thighs dry. Season both sides with salt, pepper, and lemon zest. Place thighs on top of the vegetables.
- Thinly slice the lemon and tuck slices around the chicken. Drizzle chicken lightly with oil.
- Roast 30–35 minutes, until chicken reaches 165°F (74°C) and potatoes are tender. If boneless thighs, check at 20–25 minutes.
- Squeeze any remaining lemon juice over the top and serve.
Winner: DeepSeek V4 Pro. Both suggested the same easy lemon tray bake. DeepSeek gave the safe cooking temperature for chicken (165°F / 74°C), said to pat the thighs dry and to check boneless ones sooner. ChatGPT only said “until the chicken is cooked through”, though it had a good tip to crisp the skin under the grill.
Test 6 · Explaining money in plain words
Explaining money in plain words: DeepSeek, by a nose
What we asked
Explain the difference between a Roth IRA and a traditional IRA in plain words, like you'd explain it to a friend over coffee. Keep it under 150 words and add one simple example.
A traditional IRA and a Roth IRA are both retirement accounts, but the main difference is when you pay taxes.
With a traditional IRA, you may get a tax break now when you put money in. But later, when you take money out in retirement, you pay taxes on it.
With a Roth IRA, you pay taxes now because you contribute money from your paycheck after taxes. But later, in retirement, you can usually take the money out tax-free.
Simple example:
If you put $5,000 into a traditional IRA, it might lower your taxable income this year. If you put $5,000 into a Roth IRA, no tax break now—but if it grows to $20,000 by retirement, you may be able to withdraw that $20,000 tax-free.
A traditional IRA gives you a tax break now: you put in money before it’s taxed, so your taxable income drops this year. You pay taxes later when you withdraw in retirement.
A Roth IRA is the opposite: you put in money after you’ve already paid taxes on it, so no tax break now. But in retirement, you withdraw it tax-free, including any growth.
Simple example: You put $5,000 in a traditional IRA and it grows to $20,000. You pay taxes on $20,000 later. With a Roth, you pay taxes on the $5,000 now, but that $20,000 comes out tax-free later.
Rule of thumb: pick traditional if you think your tax rate is higher now than in retirement; pick Roth if you think it’s lower now.
Winner: DeepSeek V4 Pro. Both explained the difference well and stayed under the limit. DeepSeek used the same $20,000 in both examples, so you see the difference at a glance, and added a one-line rule of thumb to help you choose. Remember that neither replaces a financial adviser.
Test 7 · A bedtime story for a grandchild
A bedtime story: ChatGPT is about Leo
What we asked
Write a short bedtime story, about 200 words, for my 6-year-old grandson Leo, who loves dinosaurs and is a bit scared of the dark. Make it calm, with a gentle happy ending.
Leo and the Little Night Dinosaur
One evening, Leo snuggled under his blanket while the moon peeked through the curtains. His room was quiet, and the corners looked a little too shadowy.
Just then, he heard a tiny tap tap tap.
Out from behind his toy box stepped a small green dinosaur with sleepy eyes and a soft, swishy tail.
“Hello,” whispered the dinosaur. “I’m Pip. I’m a Nightasaurus.”
Leo blinked. “Are you scary?”
Pip shook his head. “Oh no. Nightasauruses help children remember that the dark is only the daytime resting.”
Leo looked around. “But the shadows look strange.”
Pip padded over to the wall. “That’s your chair, wearing a shadow hat. And that’s your teddy, making a big teddy shape.” He gave a gentle yawn. “Nothing in your room changes when the light goes out.”
Leo smiled a little.
Pip curled up beside the bed. “If you feel worried, take a slow dinosaur breath. In… and out…”
Leo breathed in. Then out.
The room felt softer now. The moon shone like a quiet night-light, and Pip’s tail made a cozy little swoosh.
“Goodnight, Leo,” whispered Pip.
“Goodnight, Pip,” Leo murmured.
And with a happy heart, Leo drifted gently to sleep.
The little dinosaur named Leo had a long day of stomping through ferns and munching crunchy leaves. But now the sun was sinking, and the big, dark night was coming.
Leo wiggled his tail. “I don’t like the dark,” he whispered.
Just then, a friendly glow drifted by. It was Glimmer, a tiny dinosaur with a tail that sparkled like a night-light.
“Don’t worry,” said Glimmer softly. “The dark is just the sky putting on its soft, starry blanket.”
She lifted her tail, and a warm, gentle light spread over Leo’s nest of moss. “See? The moon is a night-light, and the stars are tiny dinosaur smiles watching over you.”
Leo looked up. The dark wasn’t empty at all. It was full of soft, twinkling lights.
Glimmer curled up beside him. “I’ll keep my tail glowing until you fall asleep.”
Leo snuggled down, feeling safe and warm. He closed his eyes, listening to the quiet hum of the night. The dark felt like a gentle hug now, and Leo smiled as he drifted off to dream of sunny meadows and happy dinosaur friends.
Winner: GPT 5.5. ChatGPT put Leo in his own bedroom with a friendly little dinosaur, Pip, who shows him the shadows are just his chair and teddy, and teaches him a slow breathing trick. DeepSeek's story was sweet, but it turned Leo himself into a little dinosaur, so it doesn't help with his own dark room.
Test 8 · Planning a short trip
Planning a trip: a tie
What we asked
Plan a relaxed 3-day trip to Lisbon for my wife and me. We're in our sixties, we don't want long walks up steep hills, and we love food and views. Give a simple plan for each day with one or two tips.
Day 1: Baixa, Chiado & a Sunset View
Morning:
Start in Baixa, Lisbon’s flatter downtown area. Stroll around Praça do Comércio by the river, then take your time along the elegant streets toward Rossio Square.
Lunch:
Have a relaxed seafood lunch at Cervejaria Ramiro or a traditional meal at Solar dos Presuntos.
Afternoon:
Take the Santa Justa Lift or a taxi up toward Chiado for coffee and pastries. Visit Bertrand Bookshop or sit at a café near Largo do Chiado.
Evening:
Enjoy the view from Miradouro de São Pedro de Alcântara, then have dinner nearby in Bairro Alto or Príncipe Real.
Tips:
- Use taxis or Bolt/Uber for uphill sections; they’re inexpensive and save energy.
- Go to viewpoints by car when possible, then walk only short distances.
Day 2: Belém, Monuments & Pastéis de Nata
Morning:
Take a taxi or tram to Belém, a mostly flat and easy area by the river. Visit the Jerónimos Monastery and see the Belém Tower from the outside.
Lunch:
Eat at O Prado or try a riverside restaurant such as À Margem for a relaxed meal with views.
Afternoon:
Stop at Pastéis de Belém for the famous custard tarts. If you enjoy museums, visit the MAAT or the Coach Museum, both manageable and not too strenuous.
Evening:
Return to central Lisbon and have dinner in Cais do Sodré or Time Out Market if you want lots of food choices in one place.
Tips:
- Belém is one of the best areas for avoiding steep hills.
- Visit Jerónimos early to avoid the longest lines.
Day 3: Alfama Views Without the Climb & a Special Dinner
Morning:
Take a taxi up to Castelo de São Jorge or directly to Miradouro das Portas do Sol. Enjoy the classic Lisbon views over Alfama and the river without walking uphill.
Lunch:
Have lunch in Alfama at a small traditional restaurant, or take a taxi down to Praça do Comércio for an easier, flatter option.
Afternoon:
Ride the scenic Tram 28 for part of the route if it’s not too crowded, or choose a private tuk-tuk tour for a more comfortable way to see the old neighborhoods.
Evening:
Book a memorable final dinner:
- Bairro do Avillez for modern Portuguese food
- Alma or Belcanto for a Michelin-starred experience
- A gentle Fado dinner in Alfama or Chiado if you’d enjoy music
Tips:
- Alfama is beautiful but very hilly and uneven, so use taxis between stops.
- For Tram 28, board early in the day or skip it if the line is long.
Here’s a relaxed 3-day Lisbon plan with your priorities in mind: easy on the legs, plenty of food, and lovely views. Lisbon is hilly, so this plan leans on taxis, tuk-tuks, and flat riverside areas.
Where to stay: Baixa, Chiado, or near Avenida da Liberdade — flatter and central.
Day 1 – Baixa, Chiado & Alfama Views
Morning
Start gently at Praça do Comércio, then take a taxi or the Santa Justa lift area over to Chiado.
Have coffee and a pastel de nata at Manteigaria.
Lunch
Taxi to Cervejaria Ramiro for excellent seafood — go around opening time or book if possible.
Afternoon
Take a tuk-tuk tour or taxi to the viewpoints:
- Miradouro de Santa Luzia
- Miradouro Portas do Sol
Sit with a glass of wine and enjoy the red rooftops and river views. No steep walking needed.
Evening
Fado dinner in Alfama. Book ahead at Clube de Fado or Parreirinha de Alfama for a memorable, relaxed evening.
Tips:
- Book the fado restaurant in advance.
- Use tuk-tuks/taxis instead of Tram 28 — it’s scenic but often crowded.
Day 2 – Belém, River Views & Custard Tarts
Morning
Take a taxi or Uber/Bolt to Belém, which is mostly flat and easy to enjoy.
Start with coffee and warm pastéis de nata at Pastéis de Belém. Sit inside if there’s space.
Mid-morning
See Jerónimos Monastery — even just the outside is impressive. If queues are short and you feel like going in, do it; otherwise, don’t feel pressured.
Lunch
Eat by the river at À Margem or Darwin’s Café, both easy and scenic.
Afternoon
Stroll along the flat riverside path past:
- Belém Tower
- Monument to the Discoveries
- MAAT
Go at your own pace, with plenty of café stops.
Evening
Return to the center for a relaxed dinner and maybe a sunset drink at a rooftop bar such as Topo Chiado.
Tips:
- Go to Belém early to avoid the biggest crowds.
- The riverside walk is flat and easy — use a taxi for the return.
Day 3 – Food, Views & a Gentle River Cruise
Morning
Visit Mercado de Campo de Ourique, a local food market with fewer tourists than Time Out Market. Great for breakfast, pastries, cheese, and coffee.
Midday
Take a relaxed 1–2 hour Tagus River cruise. This gives you some of the best Lisbon views without walking uphill.
Afternoon
Keep it slow: either return to a favorite café/viewpoint or visit the National Tile Museum by taxi. Another easy option is browsing LX Factory.
Evening
Have a special final dinner at Páteo - Bairro do Avillez or Solar dos Presuntos — both are well-regarded, but book ahead.
Tips:
- Book the river cruise and final dinner in advance.
- If you’re tired, skip the museum and simply enjoy a long lunch or café afternoon — that’s very Lisbon.
Overall tip: Use Bolt/Uber or taxis for short hops — they’re inexpensive and save your legs. Lisbon’s charm is best enjoyed slowly, with good food and a view.
A tie. Both planned three easy days, used taxis for the hills and named real places, from Cervejaria Ramiro to Pastéis de Belém. DeepSeek leaned more on tuk-tuks and flat walks and added a river cruise; ChatGPT gave more choice for the last dinner. DeepSeek took 51 seconds to write it, ChatGPT 20.
Scorecard
| Test | Winner |
|---|---|
| 1. A condolence card | |
| 2. Understanding a confusing letter | Tie |
| 3. Spotting a scam | Tie |
| 4. A firm but polite complaint | |
| 5. Dinner from what's in the fridge | |
| 6. Explaining money in plain words | |
| 7. A bedtime story for a grandchild | |
| 8. Planning a short trip | Tie |
| Total | GPT 5.5 2 · DeepSeek V4 Pro 3 · 3 ties |
What it costs, in plain words
OpenAI sells its own monthly plan for ChatGPT, and DeepSeek has its own app. If you want to use both side by side, that usually means two accounts.
In chatmodel, GPT 5.5 and DeepSeek V4 Pro are both included in one plan, Pro, together with Claude, Gemini, Grok and many other models. You can also start for free with Instant. See the current prices on the pricing page.
Can you trust what they say?
Both did well: neither got a fact wrong in our 8 tasks. That doesn’t mean they never will. Any of these models can sound sure of itself even when a detail is wrong.
A few simple habits help:
- Double-check anything you’ll act on: phone numbers, web addresses, opening times, dates and amounts.
- Health, money and legal questions: use the answer to understand your situation and prepare questions, then confirm with a doctor, adviser or the company itself.
- Don’t share what you wouldn’t share with a stranger: passwords, full card numbers or ID numbers.
How we tested
We wrote 8 everyday tasks, the kind of things people actually ask: a condolence card, an insurance letter, a scam email, a complaint, dinner, a money question, a bedtime story and a trip. We gave GPT 5.5 and DeepSeek V4 Pro exactly the same words in chatmodel, one try each, and kept what came back without editing it. Then we compared the answers for accuracy, how well they followed the request and how useful they’d be to a real person.
One try each is a small test. The same model can answer a little differently each time, so treat the winners as a guide, not a final score. You can run any of these tests yourself with one click. To see how GPT 5.5 did against Claude on the same tasks, read ChatGPT vs Claude.
What changed
- First test: GPT 5.5 and DeepSeek V4 Pro, 8 everyday tasks, one try each.