GPT 6 Astra vs Claude Fable 5.1: OpenAI and Anthropic, head to head
Letters, a confusing insurance letter, a scam email, dinner, a trip and a bedtime story. We gave GPT 6 Astra (from the model family behind ChatGPT) and Claude Fable 5.1 exactly the same words and show you what each one wrote.
By chatmodel team Tested with OpenAI GPT 6 Astra and Claude Fable 5.1 Updated
The short answer
Claude Fable 5.1 comes out a little ahead: it won 3 of our 8 tests, GPT 6 Astra won 1 and 4 were ties. Pick Claude for warm writing and friendly explanations. Pick GPT 6 Astra for careful paperwork and shorter answers, if you don't mind waiting a little longer.
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GPT 6 Astra: 1 win
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Claude Fable 5.1: 3 wins
- 4 ties
Pick GPT 6 Astra if…
- You have a confusing letter or bill and want every detail checked carefully.
- You'd rather it keep to your word limit and give you something short to send.
Pick Claude Fable 5.1 if…
- You write cards, letters or emails where the tone matters.
- You want money or everyday questions explained like a friend would, with a simple rule to remember.
Opens chatmodel with both ready: type a question and they answer next to each other. How it works
GPT 6 Astra vs Claude Fable 5.1 at a glance
| | | |
|---|---|---|
| Made by | OpenAI (the makers of ChatGPT) | Anthropic |
| Best at, in our test | Careful, precise answers about paperwork | Warm writing and friendly explanations |
| Weakest at, in our test | Slow to answer, and sometimes a bit technical | Longer answers, and one overconfident claim |
| Rounds won (of 8) | 1 (+4 ties) | 3 (+4 ties) |
| Average answer length | About 212 words | About 269 words |
| Average time to answer | About 54 seconds | About 12 seconds |
| Understands photos | Yes | Yes |
| Reads PDFs and files | Yes | Yes |
| Searches the web in chatmodel | Yes | Yes |
| Knows about things up to | April 2026 | June 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: Claude sounds more personal
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.
I’m so sorry for your loss. I’ll miss seeing your husband and his friendly wave in the mornings—it was a small kindness that always brightened my day. Thinking of you and your family, and wishing you comfort in the days ahead.
Dear [Name],
I was so sorry to hear about [Husband's name]. I'll always remember his wave every morning—such a small thing, but it made the start of my day a little brighter. I'm thinking of you and holding you in my heart. If you ever need anything at all, even just company, I'm right next door.
With love, [Your name]
Winner: Claude Fable 5.1. Both used the morning wave and stayed under 70 words. Claude Fable 5.1's card felt warmer and offered real help (“even just company, I'm right next door”). GPT 6 Astra's was shorter and plainer, ready to copy.
Test 2 · Understanding a confusing letter
A confusing insurance letter: GPT 6 Astra is more careful
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."
In plain words: your insurance counted $412 for the imaging service toward your deductible instead of paying that amount. You may need to pay Riverside Imaging, but this letter itself is not a bill.
Here’s what each part means:
- “Allowed amount of $412”: This is the amount your insurance recognizes for that service. It may be less than Riverside Imaging’s original charge.
- “Applied to your annual deductible”: A deductible is the amount you pay for certain covered care before your plan starts sharing those costs. The insurer counted this $412 toward yours. That does not mean you’ve already paid Riverside Imaging.
- “Remaining deductible … $588”: After this claim, you have $588 left to meet your deductible for the plan year. After that, you may still owe copays or a percentage of covered costs, depending on your plan.
- “180 days to file an appeal”: If you think the insurer processed the claim incorrectly, you can ask it to review the decision within that deadline. This letter does not sound like a denial; it sounds like the claim was processed under your deductible.
What to do next
- Check the details. Confirm that you received services from Riverside Imaging on August 14.
- Look at the full Explanation of Benefits (EOB) in your insurance portal or mail. Find the “patient responsibility” or “you owe” amount.
- Wait for the provider’s bill—or contact its billing office. Compare the bill with your EOB and check that any money you already paid is credited.
- Ask about discrepancies before paying. If the bill is more than $412, ask Riverside Imaging and your insurer why. If the provider was in-network and this is the only service on the bill, you generally should not owe more than the EOB’s patient-responsibility amount.
- If you think there’s an error, contact your insurer promptly. Ask for an explanation or correction, and keep the 180-day appeal deadline in mind.
Bottom line: This letter suggests you’re responsible for $412, minus anything you already paid, and have $588 left on your deductible. Confirm the actual amount due against the EOB and provider’s bill.
This is a standard notice called an Explanation of Benefits (EOB). Here's what it means in plain language:
What happened
- You had an imaging service (X-ray, MRI, ultrasound, etc.) at Riverside Imaging on August 14.
- Riverside sent the bill to your insurance company.
- Your insurance reviewed it and decided the "allowed amount" — the price they've negotiated with Riverside — is $412. Even if Riverside charged more than that, they've agreed to accept $412 as full payment.
Why insurance didn't pay
- Your plan has an annual deductible: an amount you must pay out of pocket each year before insurance starts covering costs.
- You hadn't met your deductible yet, so the full $412 counts toward it — meaning you are responsible for paying it, not the insurance company.
- After this, you have $588 left on your deductible. Once you've paid that much more in covered medical costs this year, your insurance will start paying its share.
"This is not a bill"
- The insurance company isn't asking you for money. They're just telling you how the claim was handled.
- The actual bill will come from Riverside Imaging, and it should be for $412 (or less, never more, since that's the negotiated amount).
What you should do next
- Wait for the bill from Riverside Imaging. Don't pay anything until you get it.
- When it arrives, check that it matches: the date (08/14) and the amount ($412). If they bill you more than $412, call them — they may have billed you before the insurance adjustment went through.
- Pay Riverside directly once it checks out. If $412 is a strain, ask them about a payment plan; most providers offer one.
- Keep this letter with your records for the year in case there are questions later.
- Only appeal if something looks wrong — for example, if you never had a service on that date, or you believe the service should have been covered without applying to the deductible (some preventive screenings are). If everything looks accurate, you don't need to do anything with the 180-day appeal notice.
Bottom line: nothing went wrong here. This is just how deductibles work — you pay the early costs of the year yourself, and insurance kicks in once you've paid your deductible in full.
Winner: GPT 6 Astra. Both got it right: this is not a bill, and you'll probably owe $412. GPT 6 Astra pointed you to the “patient responsibility” line and said you shouldn't owe more if the provider was in your network. Fable 5.1 said the bill would be “never more”, which isn't always true, though it did suggest asking for a payment plan.
Test 3 · Spotting a scam
Spotting a scam: a tie, both 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"
This is almost certainly a phishing scam. Don’t click the link, reply, or pay the fee.
The warning signs are:
- The website isn’t USPS:
usps-redelivery-help.comis not the officialusps.comdomain. - The 24-hour deadline pressures you to act before checking.
- The small “redelivery fee” is a common way to steal card details. USPS redelivery is free.
What to do:
- If you’re expecting a package, type usps.com into your browser yourself or use the official USPS app. Check the tracking number from your order confirmation—not this message.
- Mark the email as phishing or spam, then delete it. You can also forward it to spam@uspis.gov, the U.S. Postal Inspection Service.
- If you already interacted with it:
- Only clicked: Close the page. Don’t download anything or allow notifications. Clicking alone doesn’t necessarily mean your device is compromised.
- Entered card details or paid: Contact your card issuer immediately using its official app or the number on your card. Ask about blocking/replacing the card and disputing any charge.
- Entered a password: Change it on the real website and anywhere else you reused it; enable multifactor authentication.
Did you click the link or enter any information?
Yes, this is almost certainly a scam. It's a classic "smishing"/phishing message impersonating USPS. Here's why:
Red flags:
- Fake domain: The link goes to
usps-redelivery-help.com. Real USPS links only useusps.com(e.g.,tools.usps.com). Scammers add words like "redelivery" or "help" to look legit. - Small fee request: USPS does not charge a "redelivery fee," and it never asks for payment via text/email links. The tiny $1.99 amount is bait to get your card number and billing details.
- Urgency: "Within 24 hours" is pressure designed to make you act before thinking.
- Unsolicited contact: USPS doesn't text or email you about delivery problems unless you specifically signed up for tracking notifications on a package, and even then it won't ask for money or personal info.
- Vague details: No tracking number, no sender, no description of the package.
What to do:
- Don't click the link or enter any information. If you already clicked but entered nothing, you're likely fine.
- If you entered card details: Contact your bank/card issuer immediately, report it as fraud, and request a new card. Watch your statements closely.
- If you entered a password: Change it everywhere you used it, and enable two-factor authentication.
- Report it:
- Forward the text to 7726 (SPAM) if it came by SMS.
- Email it to USPS Postal Inspection Service at spam@uspis.gov.
- Report to the FTC at reportfraud.ftc.gov.
- Delete the message and block the sender.
- If you're genuinely expecting a package: Go directly to usps.com (type it yourself) and check your tracking number there, or call 1-800-ASK-USPS.
Rule of thumb: any delivery-notification message asking for a fee or your personal info through a link is a scam until proven otherwise.
A tie. Both were right from start to finish, with the correct address for reporting it, spam@uspis.gov. Fable 5.1 gave more ways to report it and the USPS phone line. GPT 6 Astra was shorter and ended by asking whether you'd clicked, so it could help with the next step.
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.
Subject: Lost Baggage Follow-Up – Reference LX-48213
Dear Customer Service Team,
My suitcase went missing on my flight five days ago. I filed a report at the airport (reference LX-48213), but I have received no update since.
Please confirm the status of the search and when I can expect my suitcase to be returned. Please also explain how to claim reimbursement for essential items I have had to purchase, including any required documents and deadlines.
I would appreciate a prompt response.
Kind regards, [Your Name]
Subject: Delayed Baggage – Reference LX-48213 – Request for Update and Compensation Information
Dear Customer Relations Team,
I am writing regarding my suitcase, which did not arrive on my flight on [date] (flight [number], [departure] to [destination]). I filed a Property Irregularity Report at the airport under reference LX-48213. Five days have now passed and I have received no communication from your airline.
I would appreciate the following:
- A status update on the location of my bag and its expected delivery date.
- Confirmation of your process for reimbursing essential items I have had to purchase in the meantime (clothing and toiletries), including where to submit receipts and any applicable limits.
I understand delays can occur, but the lack of any contact is disappointing. Please respond within the next 48 hours. I am aware of my rights under the Montreal Convention and would prefer to resolve this directly with you.
I can be reached at [phone number] or by replying to this email.
Kind regards,
[Your name] [Booking reference] [Address for bag delivery]
A tie. GPT 6 Astra kept it short, as asked, at 85 words. Claude Fable 5.1's was twice as long but firmer: it asked for a reply within 48 hours and left space for your flight details and delivery address. Pick the style you prefer.
Test 5 · Dinner from what's in the fridge
Dinner from what's in the fridge: Claude keeps it easy
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.
One-pan lemon chicken with potatoes and carrots
Serves 4 · About 40 minutes
You’ll also need oil, salt, pepper and ½ cup water. Optional: garlic or dried herbs.
- Prep: Cut the potatoes into ½-inch cubes, thinly slice the 3 carrots and half onion, and halve the lemon. Season the 4 chicken thighs with salt and pepper.
- Brown: Heat 1 tablespoon oil in a large, deep skillet over medium-high heat. Add chicken, skin-side down if applicable, and cook 5 minutes. Flip and cook 3 minutes; transfer to a plate.
- Add vegetables: Put potatoes, carrots and onion in the skillet. Stir for 2 minutes, then add ½ cup water and the juice of half the lemon.
- Cover and cook: Nestle chicken on top, skin-side up. Cover and simmer over medium-low heat for 20–25 minutes, until vegetables are tender and chicken reaches 165°F / 74°C in the thickest part, away from the bone. Add a splash of water if the pan dries out.
- Serve: Give each person one thigh and a share of vegetables. Spoon over the pan juices and serve with wedges from the remaining lemon half.
Lemon Roasted Chicken Thighs with Potatoes and Carrots (one-pan, ~40 minutes)
- Preheat oven to 425°F (220°C).
- Cut potatoes into 1-inch chunks and carrots into thick coins. Slice the half onion into wedges.
- Toss vegetables on a large baking sheet or roasting pan with 2 tbsp oil, salt, and pepper. Spread in a single layer.
- Pat chicken thighs dry. Rub with 1 tbsp oil, salt, pepper, and the zest of the lemon (plus dried thyme, oregano, or garlic powder if you have any).
- Nestle chicken skin-side up among the vegetables. Cut the lemon in half; squeeze one half over everything and tuck the squeezed halves onto the pan.
- Roast 30–35 minutes, until chicken reaches 165°F (75°C) and skin is golden, and potatoes are tender.
- Squeeze the remaining lemon half over the pan, rest 5 minutes, and serve.
Tip: If the vegetables need more browning, remove the chicken and return the pan to the oven for 5 extra minutes.
Winner: Claude Fable 5.1. Both gave a lemon chicken dinner in about 40 minutes, with the safe temperature for the chicken. Fable 5.1's was an oven tray bake you can mostly leave alone. GPT 6 Astra's was browned and then simmered in a covered pan on the stove, which needs more watching.
Test 6 · Explaining money in plain words
Explaining money in plain words: Claude, 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.
Think of a Roth IRA and a traditional IRA as retirement savings accounts with different timing for taxes:
- Traditional IRA: You may get a tax deduction for money you put in now. Your investments grow without yearly taxes, but withdrawals in retirement are generally taxed as income.
- Roth IRA: You put in money you’ve already paid taxes on—no upfront deduction. In return, qualified withdrawals in retirement, including investment gains, are tax-free.
Simple example: You contribute $1,000, and it grows to $3,000. With a fully deductible traditional IRA, you generally pay income tax on the $3,000 when withdrawing it. With a Roth, a qualified withdrawal of that $3,000 is tax-free.
The big question: Would you rather get a tax break now or later? Income limits and withdrawal rules also matter.
Okay, so both are retirement accounts with tax perks—the difference is when you pay the tax.
Traditional IRA: You put money in before taxes, so you get a tax break now. But when you pull it out in retirement, you pay income tax on it then.
Roth IRA: You put in money you've already paid taxes on, so no break today. But when you withdraw in retirement, it's all tax-free—including the growth.
Simple example: Say you invest $5,000 and it grows to $20,000 by retirement.
- Traditional: You saved maybe $1,000 in taxes upfront, but you'll owe taxes on the full $20,000 when you take it out.
- Roth: You paid tax on the $5,000 up front, but the whole $20,000 is yours, tax-free.
Rule of thumb: expect a higher tax bracket later? Roth. Lower? Traditional.
Winner: Claude Fable 5.1. Both were correct and under 150 words, with an example. Fable 5.1 sounded more like a friend over coffee and ended with a one-line rule for choosing. GPT 6 Astra used terms like “qualified withdrawal” without explaining them. Neither replaces a financial adviser.
Test 7 · A bedtime story for a grandchild
A bedtime story: a tie, both make 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.
Leo and the Little Night Dinosaur
One evening, Leo found a tiny dinosaur sitting beside his slippers. It was green as a pea and wore a very small scarf.
“My name is Pip,” it whispered. “Could you help me find my bedtime star?”
Leo peeked out the window. The garden was dark.
“I’m not sure,” he said. “The dark feels awfully big.”
Pip nodded. “Then we’ll look together.”
With his blanket around his shoulders, Leo sat by the window. Pip curled up in his lap, warm as a sleepy kitten.
At first, Leo could only see shadows. Then he noticed the moon shining on the apple tree. A moth fluttered gently past the glass. The garden swing rested perfectly still.
“Everything’s getting ready for bed,” Leo whispered.
“Even dinosaurs,” said Pip, with an enormous little yawn.
High above the tree, a star twinkled.
“There it is,” Pip murmured.
Leo’s room was still dim, but now he could make out his books, his teddy, and his slippers. Everything was right where it belonged.
He climbed into bed, and Pip nestled beside his pillow.
“Goodnight, garden. Goodnight, star,” Leo said.
Then, with his night-light glowing softly, Leo closed his eyes. Pip was already asleep.
Leo and the Nightlight Dinosaur
Once upon a time, in a cozy bedroom at the top of the stairs, a boy named Leo was getting ready for sleep. But when the lamp clicked off, the room felt very dark and very big.
Then Leo heard a soft thump… thump… thump.
By the window stood a small, round dinosaur with gentle eyes. Her scales glowed a warm golden color, like a candle under a blanket.
"Hello, Leo," she whispered. "My name is Glimmer. I'm a Nightlight-osaurus."
"I've never heard of that kind," said Leo.
"That's because we only visit children who are a little bit brave and a little bit sleepy," said Glimmer. "Would you like to see something?"
She padded to the corner of the room, and her glow showed Leo it was only his toy box. She tiptoed to the closet — just his coat and boots. Under the bed — one lost sock.
"See?" said Glimmer, curling up on the rug. "The dark is just the day resting. And I'll rest right here with you."
Leo yawned a great big yawn. Glimmer's glow grew softer and softer, like a sunset.
"Goodnight, Glimmer."
"Goodnight, Leo."
And Leo drifted off to sleep, warm and safe, dreaming of golden dinosaurs.
The end.
A tie. Both gave Leo a gentle dinosaur friend: Pip for GPT 6 Astra, a glowing Glimmer for Fable 5.1. Glimmer shows Leo that the dark corners are just his toy box and coat; Pip helps him find a star from the window. Both calm, both about 200 words.
Test 8 · Planning a short trip
Planning a trip: a tie, calm plan or rich plan
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.
Here’s a gentle-paced Lisbon plan built around good food, lovely views, and minimal hill-climbing. Plan on one main outing each day, a leisurely lunch, and time to rest before dinner.
Day 1 — The old centre and the river
- Morning: Start at Praça do Comércio, the grand square beside the Tagus. Enjoy a coffee, then take a short stroll along the waterfront—as far as feels comfortable.
- Lunch: Choose a sit-down restaurant in Baixa, Lisbon’s relatively flat downtown area. Try bacalhau à brás—shredded salt cod with potatoes and eggs—or grilled fish.
- Afternoon: Return to your hotel for a rest.
- Evening: Have dinner near your hotel, or take a taxi to a riverside restaurant for views as the light fades.
Tips:
- Baixa and the waterfront are good places for gentle wandering; avoid following walking directions uphill into neighbouring districts.
- Wear shoes with good grip: Lisbon’s polished paving can be slippery, especially when wet.
Day 2 — Belém: pastries and waterfront views
- Morning: Take a taxi to Belém. Start with custard tarts at Pastéis de Belém, then admire the nearby Jerónimos Monastery. Visit inside if you’re interested, but there’s no need to spend the morning queuing.
- Lunch: Stay in Belém for a relaxed Portuguese lunch—perhaps grilled sea bass or octopus.
- Afternoon: Enjoy a short waterfront stroll or a seated drink overlooking the river. If you’d like to see Belém Tower, take a short taxi ride rather than walking the entire waterfront. Seeing it from outside avoids the tower’s stairs.
- Evening: Keep dinner simple and close to your hotel.
Tips:
- Belém is mostly flat, but its sights are farther apart than they look on a map.
- If touring the monastery matters to you, check current opening arrangements and book through the official site.
Day 3 — A hilltop view without the climb
- Morning: Take a taxi to Miradouro de São Pedro de Alcântara. Enjoy the panorama from the upper terrace, with time to sit and take it all in.
- Lunch: Take another short taxi ride to Chiado for a leisurely lunch. Try arroz de marisco, a brothy seafood rice, if you both enjoy shellfish.
- Afternoon: Have a coffee and browse one or two nearby shops, or head back for a rest.
- Evening: Finish with a fado dinner if traditional Portuguese singing appeals. Choose a venue with easy taxi access and an early performance; otherwise, make your final evening a quiet dinner with a river view.
Tips:
- Ask your driver for the closest practical drop-off to the viewpoint, and use taxis between neighbourhoods rather than tackling the hills.
- For fado, reserve ahead and ask about steps at the entrance and the performance finish time.
Where to stay: A hotel in Baixa near Praça do Comércio, with a lift and taxi access close to the entrance, would make this itinerary especially comfortable.
A Relaxed 3-Day Lisbon Plan
Lisbon is famously hilly, so this plan leans on trams, taxis (cheap and plentiful), and the city's lifts to get you to the good views without the climbs.
Day 1 – The Riverside & Old Town, the Easy Way
Morning: Start at Praça do Comércio, the grand riverside square. Flat, open, and a lovely place for a coffee at one of the arcade cafés. Wander the flat streets of Baixa (the grid of shops between the square and Rossio).
Midday: Take the Elevador de Santa Justa (or, with far less queue, the free lift inside the nearby Pollux department store) up to the Carmo Convent ruins area. Lunch here in Chiado – Café A Brasileira for atmosphere, or a table on Largo do Carmo under the trees.
Afternoon: Take a taxi or Uber up to Alfama – don't walk it. Ask to be dropped at Miradouro de Santa Luzia for the classic tiled-terrace view over the rooftops and river. Sit at the kiosk with a glass of wine. If you like, descend gently on the Tram 28 back down.
Dinner: A quiet fado dinner in Alfama – Mesa de Frades (small, intimate) or Clube de Fado. Book ahead.
Tips:
- Taxis from the centre up to Alfama cost around €5–7. Use them freely – it's what locals over 60 do too.
- Tram 28 is charming but packed midday; ride it before 9am or after 6pm and you'll get a seat.
Day 2 – Belém: Monuments, Custard Tarts & a Flat Waterfront
Belém is completely flat and easily the most walkable district.
Morning: Taxi or Tram 15 to Belém. Visit the Jerónimos Monastery first thing (opens 10am, book tickets online) – the cloisters are stunning and there's little walking involved.
Midday: Queue briefly at Pastéis de Belém for the original custard tarts, warm with cinnamon. Then stroll the flat riverside promenade past the Monument to the Discoveries to the Belém Tower.
Afternoon: Lunch at Darwin's Café (inside the Champalimaud Foundation) – modern, calm, huge windows on the river. Then, if energy allows, the MAAT museum or the Coach Museum (surprisingly wonderful).
Evening: Back to the centre for dinner at Time Out Market – a food hall where you can try many things without committing, all seated indoors.
Tips:
- Do Belém on a weekday; weekends are far busier.
- Sit at the back of Pastéis de Belém rather than joining the takeaway queue – table service is quicker and you get the tiled rooms.
Day 3 – Views Without the Climb, Then a Slow Finish
Morning: Take the Elevador da Glória (a funicular from Restauradores) up to Miradouro de São Pedro de Alcântara. This is arguably the best view in Lisbon – the castle across the valley, the river beyond – and it's a garden with benches and a kiosk for coffee.
Midday: Wander gently downhill through Príncipe Real, a leafy, elegant neighbourhood with a lovely garden and independent shops. Lunch at Cervejaria Ramiro (taxi – it's a little out of the way) for the best seafood in the city: garlic prawns, clams, and the tradition of finishing with a steak sandwich.
Afternoon: Rest at the hotel, or take a river cruise from Cais do Sodré (1–2 hours, seated, very gentle) to see the city from the water at golden hour.
Evening: Final dinner with a view. Chapitô à Mesa near the castle (taxi up) has a terrace over the river; or Solar dos Presuntos for a classic, generous Portuguese meal with no view but wonderful food.
Tips:
- Buy a Viva Viagem card at any metro station and load it – it works on trams, funiculars, the metro, and the Santa Justa lift, and makes everything much cheaper than paying on board.
- Portuguese dinner is late (8:30pm onward). Booking for 8pm gets you the quiet start of service.
General Notes
- Shoes: Lisbon's pavements are polished limestone cobbles – smooth, slippery when wet, and uneven. Wear shoes with good grip.
- Pace: Everything above is deliberately half-day chunks. A siesta in the afternoon is very Lisbon.
- Ginjinha: Try a shot of this cherry liqueur at A Ginjinha on Largo de São Domingos – the tiny standing bar has been serving it since 1840.
Have a wonderful trip.
A tie. GPT 6 Astra wrote the calmer plan: one outing a day, a rest before dinner and a hotel with a lift. Claude Fable 5.1 gave far more to eat and see, from Cervejaria Ramiro to a river cruise, but packed a lot into day 1 and ran to 733 words.
Scorecard
| Test | Winner |
|---|---|
| 1. A condolence card | |
| 2. Understanding a confusing letter | |
| 3. Spotting a scam | Tie |
| 4. A firm but polite complaint | Tie |
| 5. Dinner from what's in the fridge | |
| 6. Explaining money in plain words | |
| 7. A bedtime story for a grandchild | Tie |
| 8. Planning a short trip | Tie |
| Total | GPT 6 Astra 1 · Claude Fable 5.1 3 · 4 ties |
What it costs, in plain words
OpenAI and Anthropic each sell their own monthly plan for ChatGPT and Claude. If you want both, that means two subscriptions.
In chatmodel, GPT 6 Astra and Claude Fable 5.1 are both included in one plan, Pro, together with 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: we didn’t find a wrong phone number or address in either. Claude Fable 5.1 did say a medical bill could “never” be more than the insurer’s amount, which isn’t true in every case. That’s typical: the answer sounds sure of itself even when a detail is off.
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 used the same 8 everyday tasks as our ChatGPT vs Claude test: a condolence card, an insurance letter, a scam email, a complaint, dinner, a money question, a bedtime story and a trip. We gave GPT 6 Astra and Claude Fable 5.1 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, and answer times depend on how busy the service is, so treat the winners as a guide, not a final score. Each model also has its own head-to-head with a sibling from the same company: GPT 6 Astra vs GPT 5.5 and Claude Fable 5.1 vs Claude Opus 5.
What changed
- First test: GPT 6 Astra and Claude Fable 5.1, 8 everyday tasks, one try each.