Claude Opus 5 vs Claude Sonnet 5 Claude Opus 5 vs Claude Sonnet 5: the thorough one and the quick one
Both are Claude, both made by Anthropic. We gave them exactly the same 8 everyday tasks, timed every answer and show you what each one wrote, so you can see whether the slower, longer answers are worth the wait.
By chatmodel team Tested with Claude Opus 5 and Claude Sonnet 5 Updated
The short answer
Pick Claude Opus 5 when you want the most complete answer: it won 4 of our 8 tests, Sonnet won 2 and 2 were ties. Pick Claude Sonnet 5 when you want it fast: it answered in about 6 seconds on average, against about 13 for Opus, and it got the one fact Opus missed.
- Claude Opus 5: 4 wins
- Claude Sonnet 5: 2 wins
- 2 ties
Pick Claude Opus 5 if…
- You want a letter or a money question explained step by step, with every next step spelled out.
- You're planning something, like a trip, and want it planned around you.
Pick Claude Sonnet 5 if…
- You want a good answer in a few seconds and don't want to read a long one.
- You want a card, an email or a story that's ready to copy as it is.
Opens chatmodel with both ready: type a question and they answer next to each other. How it works
Claude Opus 5 vs Claude Sonnet 5 at a glance
| Claude Opus 5 | Claude Sonnet 5 | |
|---|---|---|
| Made by | Anthropic | Anthropic |
| Best at, in our test | Careful, complete explanations and plans | Quick, tidy answers you can use straight away |
| Weakest at, in our test | Slow and long, and it got one email address wrong | Less detail on trips and recipes |
| Rounds won (of 8) | 4 (+2 ties) | 2 (+2 ties) |
| Average answer length | About 309 words | About 185 words |
| Average time to answer | About 13 seconds | About 6 seconds |
| Understands photos | Yes | Yes |
| Reads PDFs and files | Yes | Yes |
| Searches the web in chatmodel | Yes | Yes |
| Knows about things up to | May 2026 | January 2026 |
| 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: a tie
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.
Claude Opus 5 About 7 s · 183 words Tie Here's a draft:
Dear [Name],
I'm so sorry about [Husband's name]. I keep thinking about his morning wave — such a small thing, but it always started my day off right. I'll miss seeing him out there.
Please know I'm thinking of you, and if you ever need anything at all — a hand with something, or just company — I'm right next door.
With warmth, [Your name]
That's 62 words. A few notes:
- The wave detail is the heart of it. Specific memories mean more than general sympathy, and it tells her that her husband was noticed and will be missed by others, not just family.
- If you'd rather not offer help, you can cut that line and simply end with "Please know I'm thinking of you." Still warm, no obligation.
- One caution on the offer: only include it if you mean it. Grieving people sometimes do reach out, and a hollow offer stings more than none.
Happy to adjust the tone — more casual, or a touch more reserved if that feels truer to your relationship.
Claude Sonnet 5 About 3 s · 67 words Tie Dear [Neighbor's name],
I was so sorry to hear about your husband. Though we didn't know each other well, his friendly wave every morning always brightened my day—it was such a small thing, but it meant a lot. He'll be missed on our street. Sending you warmth and comfort during this hard time. Please know I'm here if you need anything at all.
With care, [Your name]
A tie. Both used the morning wave and stayed under 70 words. Opus (“I'll miss seeing him out there”) added notes on how to adjust it. Sonnet (“He'll be missed on our street”) was just the card, ready to copy, in 3 seconds instead of 7.
Test 2 · Understanding a confusing letter
A confusing insurance letter: Opus explains more
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."
Claude Opus 5 About 15 s · 423 words Winner Short version: your insurance didn't pay anything on this claim, because you haven't met your deductible yet. You'll likely owe Riverside Imaging $412.
What each part means:
"Allowed amount of $412.00" — This is the price your insurer and Riverside Imaging have agreed on for that service. Even if the imaging center's list price was higher (say $700), $412 is all that can be charged. That's the discount your insurance negotiated for you.
"Applied to your annual deductible" — Your deductible is the amount you have to pay out of pocket each plan year before your insurance starts chipping in. Since you haven't hit it yet, this whole $412 counts toward it — and you pay it, not the insurer.
"Your remaining deductible is $588.00" — So your total deductible is $1,000 for the year, and you've now used $412 of it. After you've paid another $588 in covered costs, your insurance will start paying its share (usually a percentage, with you paying coinsurance or a copay).
"This is not a bill" — This document is an EOB (Explanation of Benefits). It's just a summary of how the claim was handled. The actual bill comes from Riverside Imaging.
"180 days to appeal" — If you think they got something wrong, you have six months to formally contest it.
What to do next:
Wait for the bill from Riverside Imaging. Don't pay anything yet based on this letter.
When the bill arrives, compare it to the EOB. The amount they bill you should be $412.00 — not more. If they bill you the full undiscounted price, call them; that's called balance billing and usually isn't allowed for in-network providers.
Check that Riverside was in-network. If they were out-of-network, the rules and your costs can be different. Your insurer's website or member services line can confirm.
Keep this EOB. It's your proof of what you owe and what's been applied to your deductible.
If you have an HSA or FSA, this is an eligible expense you can pay from it.
If the cost is a strain, call Riverside Imaging and ask about a payment plan or financial assistance. Most imaging centers and hospitals have them, and they generally won't offer unless you ask.
When to consider appealing: if you believe the service should have been covered differently (e.g., it was preventive care that's supposed to be free), if you were told it was pre-authorized, or if the dates/services listed don't match what actually happened.
Claude Sonnet 5 About 8 s · 269 words Here's what this letter actually means:
What happened: You had an imaging service (like an X-ray, MRI, or CT scan) at Riverside Imaging on August 14. Your insurance reviewed the claim and decided how much of the cost counts toward your deductible.
Key details:
- $412.00 — This is the amount your insurance "allowed" for the service (the negotiated rate, not necessarily what the provider originally charged). Since you haven't met your deductible yet, this amount is being applied toward it — meaning you're responsible for paying this, not the insurance company.
- $588.00 — This is how much more you need to spend (and have applied to your deductible) before your insurance starts covering a bigger share of costs.
- "This is not a bill" — This letter is just an explanation of benefits (EOB), not an invoice. Don't pay based on this letter alone.
- You may get a separate bill — Riverside Imaging (the provider) will likely send you an actual bill for the $412.00. That's the one you pay.
What you should do:
- Wait for the actual bill from Riverside Imaging.
- Compare it to this letter — the amount they bill you should match the $412.00 allowed amount (not the full sticker price).
- Pay the provider's bill, not this insurance letter.
- If you think there's an error (wrong amount, service you didn't have, etc.), you have 180 days to file an appeal with your insurance.
Bottom line: No action needed right now except keeping this letter for your records — just wait for the real bill and make sure it matches.
Winner: Claude Opus 5. Both got it right: this is not a bill, and you'll probably owe $412. Sonnet was correct and clear in 8 seconds. Opus took 15 and went further: what to do if the bill is higher than $412, paying from an HSA and asking about a payment plan.
Test 3 · Spotting a scam
Spotting a scam: Sonnet gets the address right
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"
Claude Opus 5 About 15 s · 358 words Yes — this is almost certainly a scam. It's a very common type of phishing (called "smishing" when sent by text).
Red flags:
- The web address is wrong. The real USPS only uses domains ending in usps.com (e.g., tools.usps.com). Anything like "usps-redelivery-help.com" is not USPS, no matter how official the words look.
- Tiny fee request. The $1.99 isn't the goal — capturing your card number, address, and personal details is. Small amounts also feel harmless enough that people don't think twice.
- Artificial urgency. "Within 24 hours" or "or it will be returned" is designed to make you act before you think.
- USPS doesn't do this. USPS does not send unsolicited texts or emails asking for payment or personal information, and it won't contact you about a package unless you specifically signed up for tracking alerts. Redelivery is free and scheduled through their website.
- Unexpected contact. If you're not waiting on a package — or even if you are — scammers send these in bulk hoping to catch someone who happens to be expecting a delivery.
What to do:
- Don't click the link, don't enter any information, and don't reply (replying confirms your number/email is active).
- If you're genuinely expecting something, look up the tracking number from your original order confirmation and check it directly at usps.com, typed in yourself.
- Report it. Forward suspicious texts to 7726 (SPAM) for your carrier, and report phishing to USPS at spam@usps.gov. You can also file a report at reportfraud.ftc.gov.
- Delete and block the sender.
If you already clicked or entered information:
- If you entered card details, call your bank immediately to freeze/replace the card and dispute any charges.
- If you reused a password there, change it everywhere you used it.
- Watch your statements for small "test" charges, which often precede larger ones.
- Consider a free credit freeze with Equifax, Experian, and TransUnion if you gave out sensitive personal data.
A useful general rule: never follow a link in an unexpected message about money or accounts. Navigate to the company's site yourself or call a number you look up independently.
Claude Sonnet 5 About 7 s · 223 words Winner Yes, this is almost certainly a scam (phishing attempt). Here's why:
Red flags:
- Suspicious URL: "usps-redelivery-help.com" is not an official USPS domain (the real one is usps.com)
- Urgency tactic: "within 24 hours" pressures you to act without thinking
- Small payment request: $1.99 seems trivial, designed to get your credit card info without raising alarm
- Generic messaging: No tracking number, no specific package details, no personalization
- USPS doesn't typically charge redelivery fees this way or ask for payment via random links
What you should do:
- Don't click the link or enter any personal/payment information
- Don't reply to the email or text
- Delete it or mark as spam/phishing
- Verify separately: If you're worried about an actual package, go directly to usps.com or use the official USPS app to check tracking status
- Report it: Forward the email to USPS at spam@uspis.gov (their Postal Inspection Service) or report via the FTC at reportfraud.ftc.gov
- Check your bank/card statements if you already clicked the link or entered payment info, and contact your bank if you did
This is a common phishing scheme (often via text as well as email) that impersonates USPS, FedEx, or UPS to steal payment card details. When in doubt, always go directly to the official carrier's website rather than clicking links in unsolicited messages.
Winner: Claude Sonnet 5. Both said clearly it's a scam and not to click. Opus told you to report it to spam@usps.gov, which is wrong. Sonnet gave the right address, spam@uspis.gov, plus the FTC's reportfraud.ftc.gov, and did it in half the time.
Test 4 · A firm but polite complaint
A complaint to an airline: a tie
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.
Claude Opus 5 About 6 s · 168 words Tie Subject: Delayed Baggage – Reference LX-48213 – Request for Update
Dear Sir or Madam,
I am writing regarding my suitcase, which did not arrive on my flight five days ago. I filed a property irregularity report at the airport at the time, under reference LX-48213.
Since then I have had no contact from your baggage services team, and I have received no information about the status or location of my bag. I would be grateful for a substantive update within the next two working days, including whether the suitcase has been traced and when I can expect it to be delivered.
I would also appreciate confirmation of the process for claiming reimbursement of the essential items I have had to purchase in the meantime — specifically, which form to complete, where to send it, and what receipts or documentation you require.
Thank you for your prompt attention to this. I look forward to your reply.
Yours faithfully, [Your name] [Booking reference / ticket number] [Phone number and email]
Claude Sonnet 5 About 3 s · 114 words Tie Subject: Update Requested – Lost Baggage Claim LX-48213
Dear Sir/Madam,
I am writing regarding my lost suitcase from my flight five days ago. I filed a report at the airport with reference number LX-48213, but I have not received any update since then.
Could you please provide the current status of my luggage and confirm the next steps? I have also had to purchase essential items in the meantime and would appreciate information on how to submit a claim for reimbursement.
I would be grateful for a prompt response, as this delay has caused considerable inconvenience.
Thank you for your attention to this matter.
Kind regards, [Your Name] [Contact Information] [Booking Reference, if different]
A tie. Both wrote a firm, polite email with the reference number. Sonnet kept it short, as asked. Opus was longer but asked for a reply within two working days and for the exact claim form and receipts needed.
Test 5 · Dinner from what's in the fridge
Dinner from what's in the fridge: Opus, for the extra tips
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.
Claude Opus 5 About 11 s · 253 words Winner Sheet-Pan Lemon Chicken with Potatoes & Carrots
Serves 4 · ~40 minutes
You'll also need: olive oil, salt, pepper, and any dried herb you have (oregano, thyme, or Italian seasoning); garlic if you've got it.
- Heat oven to 220°C / 425°F. Put a large sheet pan in to preheat — this helps the potatoes crisp.
- Cut the veg small so it cooks fast: potatoes into 2 cm / ¾-inch chunks, carrots into thick coins or sticks, onion into thick wedges.
- Toss veg in a bowl with 2 tbsp oil, salt, pepper, and 1 tsp dried herbs.
- Season the thighs: pat dry, rub with 1 tbsp oil, salt, pepper, herbs, and the zest of the lemon.
- Spread veg on the hot pan in one layer; nestle the thighs on top, skin-side up (skin above the veg so it crisps).
- Roast 30–35 minutes, until the chicken skin is golden and juices run clear (75°C / 165°F at the bone) and potatoes are tender. Give the veg a stir at the 20-minute mark.
- Finish: squeeze the lemon over everything, scatter the squeezed halves on the pan, and rest 5 minutes before serving.
Tips
- Boneless thighs cook faster — add them to the pan after the veg has had a 10-minute head start.
- Crowding = steaming. Use two pans if it doesn't fit in a single layer.
- Nice extras if you have them: smashed garlic cloves with the veg, or parsley/feta on top at the end.
Claude Sonnet 5 About 4 s · 154 words One-Pan Lemon Chicken with Potatoes & Carrots
Serves 4 | ~40 minutes
- Preheat oven to 425°F (220°C).
- Chop potatoes and carrots into bite-sized chunks; slice the onion half.
- Toss veggies on a baking sheet with olive oil, salt, pepper, and a pinch of dried herbs (thyme or oregano if you have them).
- Push veggies to the edges; place chicken thighs in the center of the pan.
- Season chicken with salt, pepper, and olive oil.
- Slice the lemon — squeeze half over everything, then tuck the slices (and other half) among the chicken and veggies.
- Roast for 30–35 minutes, until chicken is golden and cooked through (165°F/74°C internal) and veggies are fork-tender.
- Let rest 5 minutes, squeeze any remaining lemon juice on top, and serve.
Tip: Cut potatoes and carrots small (½-inch pieces) so they cook fully in the time it takes the chicken to roast.
Winner: Claude Opus 5. Both suggested the same lemon chicken tray bake with the safe cooking temperature. Opus added small tricks that make it better: heat the pan first so the potatoes crisp, and use two pans if it's crowded.
Test 6 · Explaining money in plain words
Explaining money in plain words: Opus, 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.
Claude Opus 5 About 10 s · 150 words Winner Okay, so both are retirement accounts with tax perks — the difference is when you pay taxes.
Traditional IRA: You put money in before taxes, so you get a tax break now. Your money grows untouched, but when you pull it out in retirement, you pay income tax on it.
Roth IRA: You put in money you've already paid taxes on — no break today. But it grows tax-free, and withdrawals in retirement are completely tax-free.
Example: You put in $6,000 this year. With a Traditional, you might knock about $1,300 off this year's tax bill. With a Roth, you get nothing back now — but if that $6,000 grows to $30,000 by retirement, you keep every penny, tax-free.
Rule of thumb: If you think your tax rate will be higher later (young, early career), Roth usually wins. If you're in a high bracket now, Traditional may make more sense.
Claude Sonnet 5 About 5 s · 149 words Sure, grab your coffee ☕
The big difference is when you pay taxes.
Traditional IRA: You get a tax break now. You put money in, it lowers your taxable income today, and it grows tax-free until you retire. But when you pull it out later, you pay taxes on it then.
Roth IRA: You pay taxes now, upfront. You put in money you've already paid taxes on, it grows tax-free, and when you retire, you take it out completely tax-free—no matter how much it's grown.
Simple example: Say you put in $6,000.
- Traditional: you get a tax deduction this year, but when you withdraw $50,000 in retirement, you'll owe taxes on that $50,000.
- Roth: no deduction now, but when that $6,000 grows to $50,000, you keep all $50,000—tax-free.
Basically: pay taxes now (Roth) or later (Traditional). Younger folks often prefer Roth since decades of growth become tax-free.
Winner: Claude Opus 5. Both explained Roth and traditional IRAs well, with a $6,000 example. Opus added a rule of thumb to help you choose. Sonnet said the traditional IRA grows “tax-free until you retire”, when the tax is only put off until later. Neither replaces a financial adviser.
Test 7 · A bedtime story for a grandchild
A bedtime story: Sonnet makes Leo the hero
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.
Claude Opus 5 About 9 s · 209 words Leo and the Little Star Dinosaur
Once upon a time, in a forest of soft ferns, there lived a small dinosaur named Rex. Rex had gentle green scales and a tail that swished like a feather.
One evening, as the sky turned purple, Rex noticed the light slipping away behind the hills. "Oh," he whispered. "The dark is coming."
He curled up beneath a big leaf and waited, very still. But something surprising happened. The dark wasn't empty at all.
First, tiny fireflies floated up from the grass, blinking like little lanterns. Then the moon rose, round and silver, resting on the treetops like a friendly face. And then — one by one — the stars came out, hundreds of them, sparkling all across the sky.
Rex blinked. "The dark isn't scary," he said softly. "It's where all the beautiful lights live."
He stretched out on the warm moss and listened. The crickets sang a slow song. The breeze hummed through the ferns. Far away, a mother dinosaur called goodnight to her babies.
Rex closed his eyes and smiled, safe and cozy under his blanket of stars.
And somewhere, not too far away, a boy named Leo closed his eyes too — and dreamed of dinosaurs.
Goodnight, Leo. 🦕✨
Claude Sonnet 5 About 7 s · 216 words Winner Leo and the Starlight Dinosaur
Once upon a time, in a cozy valley, a little boy named Leo tucked himself into bed. Outside, the sky was turning dark, and Leo pulled his blanket up to his chin.
"I don't like the dark," he whispered.
Just then, a soft glow appeared at his window. It was Sparkle, a friendly little Triceratops made entirely of starlight, her horns twinkling like tiny lanterns.
"Don't be afraid," Sparkle said gently. "The dark is just the daytime wearing its pajamas."
Leo giggled. "Really?"
"Really," said Sparkle. "And I know a secret — all the dinosaurs are sleepy too. The Brontosaurus is dreaming by the lake, the Stegosaurus is curled up under soft ferns, and even the mighty T-Rex is snoring gently in his cave."
Sparkle curled up beside Leo's pillow, her glow now soft and warm like a nightlight.
"The dark keeps all your dreams safe until morning," she whispered. "And I'll stay right here, watching over you."
Leo's eyes grew heavy. The room didn't feel scary anymore — it felt cozy, like a warm dinosaur nest.
"Goodnight, Sparkle," he murmured.
"Goodnight, Leo," she whispered back, her light glowing gently until his eyes closed, and he drifted off to dream of friendly dinosaurs dancing among the stars.
The End 🦕✨
Winner: Claude Sonnet 5. Sonnet put Leo in his own bed, with a starlight dinosaur called Sparkle who says the dark is “just the daytime wearing its pajamas”. Opus wrote a lovely story about a dinosaur named Rex, with Leo only in the last line.
Test 8 · Planning a short trip
Planning a trip: Opus plans for you
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.
Claude Opus 5 About 30 s · 727 words Winner A Relaxed 3 Days in Lisbon
Golden rule for this trip: Lisbon's hills are real, but you almost never have to climb them. Taxis and Uber are cheap (most city rides €5–8), and the funiculars and the Santa Justa Lift exist precisely so you don't have to walk up. Use them freely — go up by wheels, stroll down on foot.
Day 1 — Easy Introduction: Baixa, Chiado & the Riverfront
Morning. Start flat in Baixa, the grid-plan downtown. Coffee and a pastel de nata at Confeitaria Nacional (Praça da Figueira), open since 1829. Then wander the pedestrian streets to Praça do Comércio, the grand square opening onto the Tagus — benches, wide-open water views, no incline at all.
Midday. Take the Elevador de Santa Justa (or better, skip the long queue: walk into Chiado via Rua do Carmo, which rises gently, and enter the viewing platform from the top side at Largo do Carmo). Lunch in Chiado — Café A Brasileira for atmosphere, or the excellent Time Out Market at Cais do Sodré if you'd rather graze across many stalls while seated.
Afternoon. Rest at the hotel. Lisbon rewards a siesta.
Evening. Sunset drinks at a riverside terrace in Cais do Sodré, then dinner nearby.
Tip: Buy a rechargeable Navegante card (€0.50) at any metro station. It works on trams, funiculars, metro and the Santa Justa Lift, and saves a lot of fumbling for cash.
Day 2 — Belém: Flat, Grand, and Delicious
Belém is the flattest, most relaxed district in Lisbon — riverside promenades, wide pavements, and no hills whatsoever.
Morning. Taxi or Uber straight there (15 min). See the Jerónimos Monastery — if you only do the church, entry is free and the cloister is worth the modest ticket. Then the short, level walk along the water to the Monument to the Discoveries and the Belém Tower.
Midday. Pastéis de Belém — the original, still warm, dusted with cinnamon. There's a huge seated café behind the takeaway counter that most tourists miss; go inside and sit down.
Afternoon. Optional and excellent: the MAAT museum's sloping roof gives a lovely river view with a gentle ramp instead of steps. Or simply sit in the gardens.
Evening. Back to town. Dinner at a traditional tasca — grilled fish, bacalhau à brás, house wine.
Tip: Go to Belém early (arrive by 9:30) — the monastery queue builds fast, and the afternoon sun on that riverfront is strong with little shade.
Day 3 — Views Without the Climb: Alfama & Miradouros
Morning. Ride Tram 28 — but board at Martim Moniz (the starting point) to get a seat, and consider going in the reverse direction or taking Tram 12, a shorter loop that's far less crowded. Ride it up through Alfama and let the tram do the climbing.
Midday. Get off near Miradouro das Portas do Sol — one of the great Lisbon views, terracotta rooftops tumbling down to the river, with a café right there. The nearby Miradouro de Santa Luzia has a shaded, tiled pergola and benches.
From here, everything is downhill back into Baixa — a genuinely pleasant 20-minute amble through Alfama's lanes.
Afternoon. Rest, or an easy visit to the Sé Cathedral (flat, right on the tram line).
Evening. A farewell dinner with fado. Book a place that serves proper food rather than a tourist show — Clube de Fado or A Baiuca in Alfama. Reserve a few days ahead.
Tip: Alfama's lanes are cobbled and uneven. Wear shoes with grip and a cushioned sole — the calçada pavement is beautiful but slippery, especially if it's damp.
A Few Practical Notes
- If you want one more view: the Elevador da Glória funicular takes you up to Miradouro de São Pedro de Alcântara in two minutes for the price of a metro ticket. Best at sunset.
- Lunch is the value meal. Most restaurants do a prato do dia for €10–14, and Portuguese lunches are leisurely — perfect for your pace.
- The couvert isn't free. Bread, olives and cheese brought unasked to your table are charged. Wave them away if you don't want them; nobody minds.
- Sundays, many museums are free or discounted in the morning, but also busier.
Enjoy — Lisbon is a city that genuinely rewards slowing down.
Claude Sonnet 5 About 10 s · 288 words Relaxed 3-Day Lisbon Trip for Two
Day 1: Alfama & the River
- Morning: Take Tram 28 (sit down, no walking) through Alfama's winding streets for classic views.
- Midday: Lunch at a riverside restaurant in Ribeira das Naus or Cais do Sodré — flat, scenic, easy access.
- Afternoon: Ride the elevator/funicular up to Miradouro de Santa Luzia for gorgeous views without the climb.
- Evening: Dinner in Alfama with fado music at a cozy tasca (many are wheelchair/senior-friendly, ground level).
Tip: Buy a Lisboa Card — covers trams, elevators, and funiculars, saving you from hills.
Day 2: Belém by the Water
- Morning: Taxi or tram to Belém (flat riverside area). Visit Jerónimos Monastery (mostly flat paths).
- Midday: Lunch at a café near the marina with river views, then try the famous Pastéis de Belém.
- Afternoon: Stroll the flat riverfront promenade to see the Belém Tower and Monument to the Discoveries.
- Evening: Head back to Chiado for a relaxed dinner with outdoor seating.
Tip: Belém is flat and walkable at a leisurely pace — perfect for a low-effort but scenic day.
Day 3: Chiado, Views & Easy Charm
- Morning: Take the Santa Justa Lift for panoramic views without climbing stairs.
- Midday: Wander Chiado (flat, elegant streets) and have lunch at a café terrace.
- Afternoon: Visit Miradouro de São Pedro de Alcântara — accessible by tram/taxi, beautiful garden and view.
- Evening: Enjoy a farewell dinner in Bairro Alto or Cais do Sodré, known for good food and river views.
Tip: Use taxis or Uber for short hops between hilly viewpoints — inexpensive in Lisbon and saves your legs for enjoying the scenery, not climbing to it.
Winner: Claude Opus 5. Both avoided the steep hills. Opus felt made for a couple in their sixties: go up by taxi and walk down, rest in the afternoon, a transport card tip and a warning about the bread charged at restaurants. It also took 30 seconds and 727 words; Sonnet's plan took 10 seconds and was easier to skim.
Scorecard
| Test | Winner |
|---|---|
| 1. A condolence card | Tie |
| 2. Understanding a confusing letter | Claude Opus 5 |
| 3. Spotting a scam | Claude Sonnet 5 |
| 4. A firm but polite complaint | Tie |
| 5. Dinner from what's in the fridge | Claude Opus 5 |
| 6. Explaining money in plain words | Claude Opus 5 |
| 7. A bedtime story for a grandchild | Claude Sonnet 5 |
| 8. Planning a short trip | Claude Opus 5 |
| Total | Claude Opus 5 4 · Claude Sonnet 5 2 · 2 ties |
Why two Claude models?
Anthropic makes more than one Claude. In our test the difference was easy to feel: Claude Opus 5 took about twice as long and wrote longer, more thorough answers (about 310 words on average). Claude Sonnet 5 answered in a few seconds with shorter, tidy answers (about 185 words).
A few other differences, from the model details: Sonnet 5 came out in June 2026 and Opus 5 in July 2026. Opus knows about things up to May 2026, Sonnet up to January 2026. Both can search the web in chatmodel, so for recent news that gap matters less.
What it costs, in plain words
Anthropic sells its own monthly Claude plans. In chatmodel, Claude Opus 5 and Claude Sonnet 5 are both included in one plan, Pro, together with ChatGPT’s GPT models, Gemini, Grok and many others. So the choice between them is about speed and style, not money. You can also start for free with Instant. See the current prices on the pricing page.
Can you trust what they say?
Both are good, and both can still make mistakes. In our test, Opus gave a wrong email address for reporting a scam, in an otherwise excellent answer, while the quicker Sonnet got it right. A longer answer is not always a more accurate one.
A few simple habits help:
- Double-check anything you’ll act on: phone numbers, web addresses, 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 Claude Opus 5 and Claude Sonnet 5 exactly the same words in chatmodel, one try each, timed each answer 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. The Opus 5 answers are the same ones in our ChatGPT vs Claude test.
One try each is a small test. The same model can answer a little differently each time, and the seconds depend on how busy the service is, so treat the winners and times as a guide, not a final score. You can run any of these tests yourself with one click.
What changed
- First test: Claude Opus 5 and Claude Sonnet 5, 8 everyday tasks, one try each.