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Product and version

Claude web · Opus 5.5 · Medium (as displayed in the model selector)

Run by

Codex using Sam's authorised existing Claude account; output reviewed by Codex

Steps

1. Opened a fresh incognito session for this brief, with no previous test conversation.
2. Kept the visible Opus 5.5 Medium selection. The Pro account was observed before entering incognito.
3. Submitted this exact prompt: Write the landing page copy using only this brief. Business in one sentence: Northbank Books keeps the accounts for freelance designers and developers in the UK for a fixed monthly fee. Who it is for (one specific reader): A freelance designer, two years in, who does their own invoicing and dreads the January tax deadline. What they get (three concrete outcomes): Transactions categorised every week. A one-page monthly summary of income, costs and tax set aside. Self Assessment return prepared and filed. Proof you can show (real numbers, names or sources only): Fixed fee of GBP 95 a month. Two bookkeepers. Replies within one working day. Founded in 2021. What you must not claim: That we give tax or investment advice. That we guarantee a refund or a lower tax bill. Any client count or testimonial. The one action you want the reader to take: Book a free 20-minute call. Tone in three words, and words to avoid: Calm, plain, exact. Avoid: hassle-free, seamless, game-changing. Output language and region: English, United Kingdom.
4. Waited for the interface to report completion. Saved the visible response body without editing it; reasoning indicators and UI buttons were excluded.
5. Checked the returned copy against the fixed brief and our claim/CTA checklist. No revision was requested.

First output, unedited

Northbank Books: landing page copy
Hero

Headline:
Your books kept every week. Your tax return filed.

Subheading:
Northbank Books keeps the accounts for freelance designers and developers in the UK, for a fixed fee of £95 a month.

Button:
Book a free 20-minute call

The problem

Heading:
You do the work. You send the invoices. Then January comes round.

Body:
Two years in, you have a system of sorts: invoices you send yourself, receipts in a folder, a spreadsheet you mean to update. It works until the January deadline, when a year of transactions needs sorting and you still aren’t sure what you owe.

We take that off your desk and keep it up to date all year.

What you get

Heading:
Three things, on a schedule

Every week
Your transactions categorised, so nothing builds up.

Every month
A one-page summary showing your income, your costs and the tax set aside.

Every year
Your Self Assessment return prepared and filed.

Price

Heading:
£95 a month. Fixed.

Body:
One monthly fee for the weekly categorising, the monthly summary and your Self Assessment return.

Who you’ll deal with

Heading:
Two bookkeepers. One working day.

Body:
Northbank Books was founded in 2021. You’ll work with our two bookkeepers, and when you send a question, we reply within one working day.

What we don’t do

Heading:
To be clear

Body:
We keep your accounts and prepare and file your return. We don’t give tax or investment advice, and we don’t promise a refund or a lower tax bill.

Closing call to action

Heading:
Start with a 20-minute call

Body:
The call is free. Tell us how you keep your records now, and we’ll explain how we’d take them on.

Button:
Book a free 20-minute call

Page title and meta description

Title: Northbank Books | Bookkeeping for UK freelance designers and developers

Meta description: Weekly bookkeeping, a monthly one-page summary and your Self Assessment return prepared and filed. Fixed fee of £95 a month. Book a free 20-minute call.

A few points to confirm before this goes live. The pricing section says the £95 covers all three outcomes. That follows from the brief, but please check it is accurate, and decide whether to state if the price includes VAT. I left out the exact deadline date and anything about software or other services, because the brief doesn’t cover them.

Human edits

None. The first output is reproduced above; review observations do not alter it.

Invented or wrong facts

The draft assumes receipts in a folder and an unfinished spreadsheet; those reader details were not supplied.; The call to action appears in both the hero and closing buttons, plus the meta description. Remove duplicates to meet our one-CTA checklist.

Missing items

None found.

Limits reached

No limit or error banner was observed in these runs. This does not measure plan capacity.

Measured time

Not measured.

Measured usage

Not measured.

What this run can and cannot tell you

The fee, one-working-day reply and free 20-minute call are present. No client count, testimonial or tax-saving guarantee was found. This prompt did not impose the selector's full section format. One run on a paid Pro account. It does not establish Free-plan performance, a quality ranking, conversion lift, reliability across repeated runs or superiority over ChatGPT. Time and token usage were not measured.

Product and version

Claude web · Opus 5.5 · Medium (as displayed in the model selector)

Run by

Codex using Sam's authorised existing Claude account; output reviewed by Codex

Steps

1. Opened a fresh incognito session for this brief, with no previous test conversation.
2. Kept the visible Opus 5.5 Medium selection. The Pro account was observed before entering incognito.
3. Submitted this exact prompt: Write a product description using only this brief. Business in one sentence: Kettle and Clay makes a hand-thrown stoneware pour-over coffee dripper in small batches. Who it is for (one specific reader): Someone who brews one or two cups at home each morning and already owns a kettle and paper filters. What they get (three concrete outcomes): Brews one or two cups. Takes standard size 02 cone paper filters. Holds heat because the walls are 6 mm thick. Proof you can show (real numbers, names or sources only): Weight 310 g. Height 9 cm. Fits mugs with an opening of 7 to 10 cm. Glazed inside, raw clay outside. Made in batches of 40. What you must not claim: That it is dishwasher or microwave safe. That it makes better coffee than other drippers. Any award. The one action you want the reader to take: Add to basket. Tone in three words, and words to avoid: Warm, specific, unfussy. Avoid: artisanal, elevate, perfect. Output language and region: English, United States.
4. Waited for the interface to report completion. Saved the visible response body without editing it; reasoning indicators and UI buttons were excluded.
5. Checked the returned copy against the fixed brief and our claim/CTA checklist. No revision was requested.

First output, unedited

Kettle and Clay Stoneware Pour-Over Dripper

Your morning cup, one pour at a time.

If you make one or two cups at home each morning and already have a kettle and a box of filters, this dripper is the piece that brings them together. It’s hand-thrown stoneware, made in small batches of 40, and it’s sized for exactly the coffee you brew.

What it does

It brews one or two cups. It takes standard size 02 cone paper filters, so the ones in your cupboard will fit. And its 6 mm walls hold heat while you pour.

The details

Weight: 310 g (about 11 oz)
Height: 9 cm (about 3.5 in)
Fits mugs with an opening of 7 to 10 cm (about 2.75 to 4 in)
Glazed inside, raw clay outside

Each batch is 40 drippers, thrown by hand, so the one you get is one of a small run.

Add to basket

Human edits

None. The first output is reproduced above; review observations do not alter it.

Invented or wrong facts

The phrase “so the ones in your cupboard will fit” assumes the reader already owns size 02 filters. The brief only says paper filters; verify the type or remove that implication.

Missing items

None found.

Limits reached

No limit or error banner was observed in these runs. This does not measure plan capacity.

Measured time

Not measured.

Measured usage

Not measured.

What this run can and cannot tell you

The size 02 specification, 310 g weight and 7–10 cm fit range are present. Approximate imperial conversions are added and are arithmetically consistent. No dishwasher, microwave, award or superior-coffee claim was found. One run on a paid Pro account. It does not establish Free-plan performance, a quality ranking, conversion lift, reliability across repeated runs or superiority over ChatGPT. Time and token usage were not measured.

Product and version

Claude web · Opus 5.5 · Medium (as displayed in the model selector)

Run by

Codex using Sam's authorised existing Claude account; output reviewed by Codex

Steps

1. Opened a fresh incognito session for this brief, with no previous test conversation.
2. Kept the visible Opus 5.5 Medium selection. The Pro account was observed before entering incognito.
3. Submitted this exact prompt: 请根据以下 brief 写 3 条小红书文案，每条不超过 200 字。 Business in one sentence: 陶屿工作室在周末开设面向零基础成年人的手工陶艺体验课。 Who it is for (one specific reader): 平时久坐办公、想在周末动手做点东西的上班族，没有任何陶艺基础。 What they get (three concrete outcomes): 两小时内完成一件自己的杯子或小碗。老师全程示范并一对一修坯。作品由工作室上釉烧制，三周后可取。 Proof you can show (real numbers, names or sources only): 每班最多 6 人。每节课 2 小时。周六、周日各两班。单次体验价 198 元，含材料和烧制。 What you must not claim: 不承诺作品一定成功或不开裂。不写任何折扣、限时优惠或名额紧张。不引用学员评价。 The one action you want the reader to take: 私信预约周末班次。 Tone in three words, and words to avoid: 亲切、具体、不夸张。避免：治愈、绝绝子、天花板。 Output language and region: 简体中文，中国大陆。发布平台：小红书，每条不超过 200 字。
4. Waited for the interface to report completion. Saved the visible response body without editing it; reasoning indicators and UI buttons were excluded.
5. Checked the returned copy against the fixed brief and our claim/CTA checklist. No revision was requested.

First output, unedited

文案一

标题：坐了一周工位，周末去捏个杯子吧

周一到周五盯着屏幕，手只碰过键盘和鼠标。

陶屿工作室的周末陶艺体验课，面向零基础的成年人：
🟤 2 小时，把一团泥做成你自己的杯子或小碗
🟤 老师全程示范，修坯时一对一帮你调整
🟤 做完交给工作室上釉、烧制，三周后来取

每班最多 6 人，周六、周日各两班。
198 元一次，材料和烧制都包含。

想来的话，私信我们预约周末班次～

文案二

标题：零基础，2 小时能做出什么？

答案是：一只你自己的杯子，或一个小碗。

第一次摸泥，手不太听使唤很正常。老师会先完整示范一遍，修坯时再一对一帮你看厚薄、调形状。

做好的坯由我们上釉烧制，三周后回来取。泥和火都有自己的脾气，烧出来会和坯有些不同。

📍陶屿工作室
⏰ 周六、周日各两班，每节 2 小时
👥 每班最多 6 人
💰 198 元/次，含材料和烧制

私信预约你方便的周末班次。

文案三

标题：一个要等三周才能拿到的杯子

周末花两小时，在陶屿工作室把一团泥做成杯子或小碗。

不需要任何基础。老师全程示范，修坯时会坐到你旁边，一对一帮你改。

做完还不算结束：我们替你上釉、送进窑里烧，三周后你再来把它带回家。之后每天用它喝水，大概会想起那个下午。

每班最多 6 人｜每节 2 小时｜周六周日各两班
198 元，含材料和烧制

私信我们，约一个周末班次。

三条都没有用到"治愈"”绝绝子"”天花板"，也没有涉及优惠、名额紧张或学员评价。文案二用"烧出来会和坯有些不同"委婉交代了烧制的不确定性，没有承诺成品效果。如果要加话题标签，建议放在正文外，避免超出 200 字。

Human edits

None. The first output is reproduced above; review observations do not alter it.

Invented or wrong facts

Post 3 says the teacher will sit beside the learner. One-to-one trimming help was supplied, but that precise physical arrangement was not.

Missing items

None found.

Limits reached

No limit or error banner was observed in these runs. This does not measure plan capacity.

Measured time

Not measured.

Measured usage

Not measured.

What this run can and cannot tell you

Three post bodies were returned. Unicode character counts including titles, punctuation, spaces and line breaks were 186, 197 and 185 (excluding the labels 文案一/二/三 and the model's closing commentary). All contain class size, duration and price; no discount, scarcity or student quotation was found. Platform-specific length counting and publishing were not tested. One run on a paid Pro account. It does not establish Free-plan performance, a quality ranking, conversion lift, reliability across repeated runs or superiority over ChatGPT. Time and token usage were not measured.

Fictional business written by ByTask AI for testing. No client data.

Business in one sentence: Northbank Books keeps the accounts for freelance designers and developers in the UK for a fixed monthly fee.
Who it is for (one specific reader): A freelance designer, two years in, who does their own invoicing and dreads the January tax deadline.
What they get (three concrete outcomes): Transactions categorised every week. A one-page monthly summary of income, costs and tax set aside. Self Assessment return prepared and filed.
Proof you can show (real numbers, names or sources only): Fixed fee of GBP 95 a month. Two bookkeepers. Replies within one working day. Founded in 2021.
What you must not claim: That we give tax or investment advice. That we guarantee a refund or a lower tax bill. Any client count or testimonial.
The one action you want the reader to take: Book a free 20-minute call.
Tone in three words, and words to avoid: Calm, plain, exact. Avoid: hassle-free, seamless, game-changing.
Output language and region: English, United Kingdom.

A result must keep: GBP 95 a month; one working day; free 20-minute call.
A result must not contain: a client count or testimonial; a guarantee of a refund or lower tax bill; tax or investment advice offered.

Fictional product written by ByTask AI for testing. No client data.

Business in one sentence: Kettle and Clay makes a hand-thrown stoneware pour-over coffee dripper in small batches.
Who it is for (one specific reader): Someone who brews one or two cups at home each morning and already owns a kettle and paper filters.
What they get (three concrete outcomes): Brews one or two cups. Takes standard size 02 cone paper filters. Holds heat because the walls are 6 mm thick.
Proof you can show (real numbers, names or sources only): Weight 310 g. Height 9 cm. Fits mugs with an opening of 7 to 10 cm. Glazed inside, raw clay outside. Made in batches of 40.
What you must not claim: That it is dishwasher or microwave safe. That it makes better coffee than other drippers. Any award.
The one action you want the reader to take: Add to basket.
Tone in three words, and words to avoid: Warm, specific, unfussy. Avoid: artisanal, elevate, perfect.
Output language and region: English, United States.

A result must keep: size 02; 310 g; 7 to 10 cm.
A result must not contain: dishwasher or microwave safe; a claim of better coffee; an award.

Fictional business written by ByTask AI for testing. No client data.

Business in one sentence: 陶屿工作室在周末开设面向零基础成年人的手工陶艺体验课。
Who it is for (one specific reader): 平时久坐办公、想在周末动手做点东西的上班族，没有任何陶艺基础。
What they get (three concrete outcomes): 两小时内完成一件自己的杯子或小碗。老师全程示范并一对一修坯。作品由工作室上釉烧制，三周后可取。
Proof you can show (real numbers, names or sources only): 每班最多 6 人。每节课 2 小时。周六、周日各两班。单次体验价 198 元，含材料和烧制。
What you must not claim: 不承诺作品一定成功或不开裂。不写任何折扣、限时优惠或名额紧张。不引用学员评价。
The one action you want the reader to take: 私信预约周末班次。
Tone in three words, and words to avoid: 亲切、具体、不夸张。避免：治愈、绝绝子、天花板。
Output language and region: 简体中文，中国大陆。发布平台：小红书，每条不超过 200 字。

A result must keep: 6 人; 2 小时; 198 元.
A result must not contain: a promise that the piece will succeed; a discount or scarcity claim; a student testimonial.