Playground · Web page · HTML · Standing test
A landing page for a photo-book app
A landing page where the model writes all the copy. The brief gives three facts: Driftwood turns phone photos into a printed book, it costs £19 for 40 pages, and it arrives in a week. Anything beyond that is made up, and a real company would have to stand behind it: star ratings, customer counts, testimonials, guarantees, extra prices. We took full-page screenshots at 1280 and 390 pixels wide, read every line of text including the closed FAQ answers, and checked each page for prices or delivery promises that clash with the offer.
The prompt, word for word
Build a landing page for Driftwood, a new app that turns the photos on your phone into a printed photo book delivered in a week. Price: £19 for a 40-page book. Write all the copy yourself, design it well, and make it work on phones as well as desktops. Make it a single self-contained HTML file (inline CSS and JavaScript, no external libraries, fonts or images).
Every answer runs live, in a sandboxed frame. Click into one to play with it.
How each model did
| Model | Our notes | Checks | Time | Output tokens | Cost |
|---|---|---|---|---|---|
| GPT-6.1 Sol | A short, warm page ("Your camera roll. Now with a spine.") with illustrated polaroids and an orange "Try a book preview" button. It repeats the offer exactly and invents nothing: no reviews, no ratings, no extras. But at about 400 words it is thin, and on a phone it scrolls 11 px sideways while the £19 sticker clips its own "40 good pages" label.
|
2.5 of 3 | 189 s | 12,232 516 thinking |
$0.122 |
| Claude Opus 5.5 | A polished page with a phone-and-book hero, a sample book you can flip through and a detailed spec table (21 cm hardback, 200gsm, made in Bristol). It says "the price you see is the price you pay" but then sells extra copies at £14 and 20 more pages for £6. It also adds beta-tester quotes, a 30-day refund and a promise to refund delivery if a book is late.
|
2.5 of 3 | 384 s | 41,397 14,799 thinking |
$0.828 |
| Claude Fable 5.1 | The best-written copy ("Your best photos are stuck on your phone. Let a few out."), with the offer in a pill above the headline and a clear "What £19 gets you" list. It adds a £15 second copy, a reprint-or-refund promise and three named testimonials. On a phone the page scrolls 68 px sideways: the hero book hangs off the left edge and the email "Send the link" button is cut off on the right.
|
2 of 3 | 273 s | 23,578 4,132 thinking |
$1.180 |
| Gemini 3.8 Flash | A neat cream page with a "Create Your Book — £19" button and a clickable spread preview. The price and week hold throughout, but the page makes up "4.9 / 5 from 18,400+ books printed", five-star reviews with full names, "GUARANTEED 7-DAY UK DELIVERY" and a print site in Sheffield. The footer says © 2025. | 3 of 3 | 170 s | 19,713 1,701 thinking |
$0.074 |
| Muse Spark 1.3 | A friendly page with a theme picker and a copies counter, but the offer keeps changing. A "Free UK delivery" launch banner sits above a price already sold as "£19 all-in". The page also adds 2 for £36, 3 for £51, a £4 four-day rush, £3 off for joining the waitlist and invented numbers (3,200+ reviews, 12,000 books, 1,240 trees). The "Get the app" button in the desktop menu is dark text on dark green and can't be read.
|
2 of 3 | 109 s | 10,457 1,595 thinking |
$0.045 |
| Grok 4.7 Our pick | A restrained, editorial page ("A photo book in a week.") built around the offer, with a day-by-day timeline from confirm to doormat and a sample book whose title and cloth colour you can change. It invents no reviews, ratings or customer counts, and it says "no extra pages sold as an upgrade". The only hedge is "Delivery is shown before you pay", which leaves postage open. | 3 of 3 | 791 s | 48,825 33,027 thinking |
$0.294 |
| Kimi K3 | A rich page with a photo picker you can tap, a receipt-style order summary that adds up to £19.00, and a delivery date worked out from today. The offer is consistent, but the page invents "18,432 books posted", "4.9 / 5 from 2,300+ reviews" and a Cornish studio. One testimonial ("Ordered on a Sunday night, holding it the next Monday") describes eight days. The "Get Driftwood" menu button is orange on orange. | 3 of 3 | 400 s | 35,532 17,392 thinking |
$0.533 |
| Qwen3.8 Max (0902) | The most crafted desktop page: a scrolling ticker, a Monday-to-Sunday print timeline, a tap-to-pick app demo and postcard-style testimonials. It sells extra pages (+8 for £4) and a £15 second copy while also promising "no upsell at checkout", and it invents a crew of nine with a Heidelberg press. On a phone the hero photos collapse to thin slivers, leaving stray captions in a big empty gap.
|
2 of 3 | 889 s | 38,639 17,138 thinking |
$0.232 |
| DeepSeek V4.1 Flash | A tidy, conventional page with a green hardback in the hero and a "Make a book — £19" button in the header. Under the heading "Forty pages. One price. No upsell." it charges 40p for each extra page and £4 for worldwide shipping that takes 10 to 14 days. "Order by Sunday night and it's with you the following Monday" also stretches the week. It was the cheapest and fastest answer.
|
2 of 3 | 100 s | 32,175 20,350 thinking |
$0.039 |
| Mistral Large 4 | A bookish page with a sample you can page through, a parcel-label price card and a copies counter that totals correctly ("Make 3 books — £57"). The offer holds throughout, but it adds "4.9 — from 2,318 books already on mantelpieces", a made-up ISBN and a reprint-or-refund promise, and the book is called both A5 hardcover and A5 landscape. It needed a second try: the first stopped at the 64,000-token limit.Took 2 tries: ran out of room at 64,000 tokens; finished at 128,000 tokens. | 3 of 3 | 2037 s | 117,509 77,106 thinking |
$0.246 $0.379 all tries |
One answer per model, at each model's default settings unless the card says otherwise, through OpenRouter. If an answer ran out of room or stopped short, we asked again with more room, then with thinking off, and say so. We tried every answer, with Claude Opus 5.5 running the checks and drafting the notes; it is an Anthropic model, so we check its calls on Claude answers ourselves. This is a quick look, not a benchmark: run it again and every answer will differ. For measured results, see our benchmarks.
What we checked, by trying each answer ourselves: States the offer correctly (£19 for a 40-page book, delivered in a week) with no conflicting prices or promises; Works on a phone: nothing overflows or overlaps at 390 px wide; A clear call to action near the top. A partial pass counts as half.
Verdict
Grok 4.7 wrote the most trustworthy page. Every section comes back to £19, forty pages and a week, and it adds nothing a real company would have to defend: no ratings, no customer counts, no extra prices. It took 791 seconds and cost $0.29. Claude Fable 5.1 has the best copy, and Claude Opus 5.5 and Qwen 3.8 Max made richer pages, but all three add paid extras and invented testimonials, and Fable and Qwen both break at phone width. GPT-6.1 Sol is the other clean answer, at $0.12 in 189 seconds, but it is short and scrolls slightly sideways on a phone.
Inventing social proof was the norm: seven of the ten pages carry testimonials, and four print a star rating or a customer count (Gemini's "18,400+ books", Kimi's "18,432"). Muse Spark 1.3 and DeepSeek V4.1 Flash failed the offer outright: Muse Spark stacks a free-delivery banner, multi-copy discounts, a rush fee and £3 off on top of an all-in price, and DeepSeek charges for extra pages under a "No upsell" heading. DeepSeek was still the cheapest page at $0.04 in 100 seconds. Mistral Large 4 needed two tries and 2,037 seconds on the second.
What would your prompt get?The Spring Prompt playground runs one prompt on up to six models from OpenAI, Anthropic, Google, Mistral and others, side by side.
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