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Clarify vs ChatGPT for Understanding Your Letters (UK 2026)

ChatGPT is a brilliant general assistant, but understanding an official UK letter needs citations, privacy, and local context. Here's an honest, side-by-side comparison of Clarify and ChatGPT — including where ChatGPT wins.

The Clarify Team

— 6 min read
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Worth knowing: A 2025 study by the Alan Turing Institute found general chatbots invented plausible-sounding but incorrect details in roughly one in five answers about official documents. When the letter is from HMRC, the NHS, or your landlord, "roughly right" isn't good enough.At a glance

  • ChatGPT is a superb general-purpose assistant and can absolutely help you make sense of a confusing letter — especially for a quick, low-stakes explanation.
  • Clarify is built specifically for reading your own documents: it answers only from the file you upload and cites the exact lines it used.
  • The biggest practical difference is citations. Clarify shows you where each answer comes from; ChatGPT usually can't point to a line in your document.
  • Clarify is designed around UK paperwork and a clear privacy posture; general chatbots are broader but less specific about either.
  • For a five-second "what does this word mean?", ChatGPT is fine. For "is this eviction notice valid and what do I do?", a citing, document-grounded tool is safer.
  • Not legal or financial advice: This article explains the differences in plain English. For your specific situation, speak to a relevant professional or Citizens Advice.

You've had a letter you don't fully understand — a tax code change, a service charge demand, a notice from your landlord — and your first instinct is to paste it into ChatGPT. That's a reasonable move. General AI is genuinely helpful at turning jargon into plain English.

But we built Clarify because "helpful" and "trustworthy enough to act on" aren't the same thing. When a letter could cost you money or affect your housing, you need to know that the answer comes from your document, not from the model's best guess.

This is our blog, so we have an obvious interest here. We've tried to keep the comparison honest — including the parts where ChatGPT is the better choice.

The core difference: grounded vs general

ChatGPT is a general model trained on a vast range of text. Ask it anything and it draws on everything it has learned. That breadth is its strength — and, for reading your specific letter, its weakness.

Clarify is deliberately narrow. When you upload a document, it answers only from that document. If the answer isn't in your file, it tells you, rather than filling the gap with something that sounds right.

Here's how that plays out across the things that actually matter:

Citations

This is the headline difference. Every Clarify answer points to the exact passage in your document it relied on, so you can check it yourself in seconds. ChatGPT can summarise text you paste in, but it generally won't tell you "this comes from paragraph 4" — and when it's working from memory rather than your file, there's nothing to check against.

Accuracy on your specific document

Because Clarify is anchored to your upload, it's far less likely to "hallucinate" a clause that isn't there. ChatGPT can do well when you paste the full text and ask a narrow question, but it's more prone to blending in general knowledge that may not apply to your particular letter.

UK context

Clarify is built around UK paperwork — HMRC codes, NHS letters, council tax, tenancy notices. ChatGPT knows about these too, but it doesn't assume a UK context, so it can drift toward US terminology or out-of-date rules unless you steer it carefully.

Privacy posture

Clarify is explicit about what it stores and doesn't train its models on your documents. General chatbots vary, and free tiers in particular may use your inputs to improve the product unless you change a setting. For a letter full of personal detail, that difference is worth understanding.

See the difference for yourself. Upload a letter you've been putting off and ask Clarify what it means. Every answer comes with a citation to the exact line in your document — so you're never taking the AI's word for it.

Try Clarify free → getclarify.co.uk

Where ChatGPT is the better choice

We'd be doing you a disservice to pretend Clarify is always the answer. ChatGPT wins in several situations:

  • Quick, general questions. "What does 'in arrears' mean?" doesn't need a document at all. ChatGPT answers instantly.
  • Drafting a reply. Once you understand a letter, ChatGPT is excellent at helping you write a response, a complaint, or a follow-up email.
  • Brainstorming and open-ended help. If you want to talk through options, weigh choices, or explore a topic broadly, a general model is more flexible.
  • You already have the full text and a simple question. Paste a short letter, ask one narrow thing, and ChatGPT will usually do fine.

A fair way to think about it: ChatGPT is a generalist who knows a bit about everything. Clarify is a specialist who only talks about the document in front of you — and always shows its working.

A worked example

Imagine you upload a Section 21 notice. Ask "Is this notice valid?" ChatGPT might give you a sensible general checklist of validity requirements — but it can't confirm whether your notice meets them unless you feed it every detail, and even then it won't cite the lines.

Clarify reads your actual notice, checks the dates and details present in the document, and points you to the specific parts that matter — while still reminding you it isn't legal advice. You come away knowing what your document says and what to verify, with the receipts to back it up.

Stop taking the AI's word for it. Clarify answers only from your uploaded document and cites every line — so you can trust it enough to act. Start with the letter that's been sitting on your kitchen table.

Get cited answers → getclarify.co.uk

How to choose

You don't have to pick one forever. Many people use both: Clarify to understand exactly what a letter says and where, then ChatGPT to help draft what they send back.

As a rule of thumb, reach for a document-grounded tool like Clarify when the stakes are real — money, housing, health, or anything you'll act on. Reach for ChatGPT when you want speed, breadth, or help writing. Either way, remember that neither tool is a substitute for a professional when a decision is serious.

Frequently asked questions

Can't I just paste my letter into ChatGPT for free?

You can, and for a quick explanation it may be all you need. The trade-offs are that it won't cite the exact lines it used, it may blend in general knowledge that doesn't apply to your letter, and on free tiers your input may be used to improve the product unless you change a setting.

What does "cited answers" actually mean?

It means every answer points back to the specific passage in your uploaded document that it's based on. You can click through and read the source line yourself, rather than trusting the AI's summary blindly.

Is Clarify more accurate than ChatGPT?

For questions about your specific uploaded document, Clarify is designed to be more reliable because it only answers from that file and shows its sources. For general knowledge questions unrelated to a document, a broad model like ChatGPT is the better fit.

Which is better for privacy?

Clarify is explicit that it doesn't train on your documents and is clear about what it stores. General chatbots vary and often use inputs to improve the service by default. If your letter contains sensitive personal detail, that difference matters.

No. Clarify explains what your document says in plain English and cites the source, but it isn't a solicitor and doesn't give regulated legal or financial advice. For a serious decision, speak to a professional or Citizens Advice.

Can Clarify handle any type of document?

Clarify is built for the everyday paperwork UK households and freelancers deal with — bills, HMRC letters, NHS letters, tenancy agreements, contracts, and more. You upload the file and ask questions in plain English.

Should I use ChatGPT to write my reply?

That's a good use of it. Once you understand a letter — ideally with a tool that cites its sources — a general model is genuinely helpful for drafting a clear, polite response.

How much does Clarify cost?

Clarify has a free tier so you can try it, with paid plans for people who need to read more documents. Check getclarify.co.uk for current pricing, as plans can change.

This article is general information only and is not legal or financial advice. It also reflects the view of Clarify, the product it discusses. For advice on your specific situation, speak to a qualified professional or contact Citizens Advice.

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