Can ChatGPT compare mortgage deals?

Yes, it can extract figures from mortgage illustrations and compare payments, fees, incentives and stated terms. It cannot decide which mortgage is suitable for you, and this is not professional advice.

Is it safe to use AI to choose a mortgage?

Use it to organise and check the figures, not as the final decision-maker. A serious case needs a regulated mortgage adviser who can assess your circumstances and accept responsibility for regulated advice.

What information do I need to compare mortgage deals?

Gather the complete mortgage illustrations, property value, deposit or equity, borrowing needed, repayment type, mortgage term, expected time in the property and planned overpayments. Include your income, employment details and relevant constraints when asking about eligibility, but do not let AI guess missing lender rules.

Can AI tell me which mortgage is best?

It can rank deals under assumptions you provide, such as the time you expect to stay and the amount you plan to overpay. It cannot establish suitability or give regulated mortgage advice, so ask a regulated mortgage adviser before applying.

PARTLY

As of 13 August 2026, AI can only partly compare mortgage deals.

This still needs a person who signs their name to it.

Can you do it?

15 minutesto a draft.

1 hourto something you’d act on.

Cost, all in£0

Skill neededchat-fluent

Who has to check ityou

What the alternative costsNo price for a mortgage adviser or comparison service is supplied here.

If this goes wrong: you choose a deal that looks cheap but has unsuitable terms, higher later payments or fees you missed.

What to actually do

Hand it to a person
The route this page recommends
A person who owns the outcome does this end to end, worth it when the failure is dear.
Use a tool built for this
Second choice

Do it yourself

The distant third

A chat interface, chat-fluent skill, and roughly 1 hour until you can act on the result.

How to actually do it

Open each lender's current mortgage illustration or offer and save the complete documents, including the pages listing rates, fees, early repayment charges, follow-on rates and eligibility conditions.
Gather your property value, deposit or equity, borrowing needed, repayment type, mortgage term, expected time in the property and any planned overpayments.
Paste the prompt into a chatbot, replace the bracketed circumstances with your figures, and paste each complete illustration under a separate deal label.
Ask the chatbot to show its calculations for initial-period payments and stated fees, and to list every figure or condition it could not find in the documents.
Compare the chatbot's extracted figures line by line with the original illustrations, correcting any rate, fee, date, payment or restriction it copied incorrectly.
Use the missing-information and questions lists to contact the lenders or a regulated mortgage adviser, then ask the adviser to assess affordability, eligibility and suitability before you apply.

Prompt

Compare the UK mortgage deals pasted below without recommending one or presenting this as regulated mortgage advice. Extract the figures exactly from the documents and mark any missing or ambiguous information instead of guessing. For each deal, show: loan amount, mortgage term, initial rate, rate type, initial-rate end date if stated, follow-on rate or SVR if stated, estimated monthly payment during the initial period, estimated monthly payment afterwards if calculable, arrangement or product fee, valuation fee, legal fee, cashback, other stated costs, early repayment charges, overpayment rules, portability, eligibility conditions, and any important restrictions. Calculate the total of stated payments and stated fees during the initial period, clearly showing your assumptions and excluding costs that are not provided. Do not treat cashback as a saving unless the document makes that clear. Separate facts copied from the documents from calculations and unknowns. Then give a neutral table of differences and a list of questions to ask a lender or regulated mortgage adviser. Do not invent rates, fees, dates, affordability results or eligibility. My circumstances are: [property price or value], [deposit or equity], [borrowing needed], [repayment or interest-only], [mortgage term], [expected time in the property], [planned overpayments], [income and employment details if relevant], [other relevant constraints]. The mortgage illustrations are: [paste each complete illustration and label it Deal A, Deal B, and so on].

Open it prefilled in ChatGPT or Claude, or copy it into Gemini, which takes no prefill link.

What it gets wrong

AI cannot know whether a deal is suitable for your income, spending, job security, credit history and future plans.
AI cannot confirm that you qualify for a lender's underwriting rules from an illustration alone.
AI cannot reliably interpret every condition affecting portability, overpayments, early repayment charges or changing circumstances.
AI cannot replace the regulated mortgage advice and accountability attached to a suitable recommendation.
AI cannot guarantee that a lender's current product, rate or fee is still available when you apply.

What caps this at PARTLY: judgement under ambiguity, verification cost and regulated advice.

How we scored this

Five axes, each scored nought to two by hand: ten means AI carries the task cleanly, and the thresholds that turn a total into YES, PARTLY or NO are published in the methodology. Each axis name links to its definition.

Axis	Score (0–2)
Output	2
Inputs	1
Verification	1
Liability	1
Effort delta	2
Total	7 / 10

The methodology and its thresholds are published in full.

FAQ

Can ChatGPT compare mortgage deals?: Yes, it can extract figures from mortgage illustrations and compare payments, fees, incentives and stated terms. It cannot decide which mortgage is suitable for you, and this is not professional advice.
Is it safe to use AI to choose a mortgage?: Use it to organise and check the figures, not as the final decision-maker. A serious case needs a regulated mortgage adviser who can assess your circumstances and accept responsibility for regulated advice.
What information do I need to compare mortgage deals?: Gather the complete mortgage illustrations, property value, deposit or equity, borrowing needed, repayment type, mortgage term, expected time in the property and planned overpayments. Include your income, employment details and relevant constraints when asking about eligibility, but do not let AI guess missing lender rules.
Can AI tell me which mortgage is best?: It can rank deals under assumptions you provide, such as the time you expect to stay and the amount you plan to overpay. It cannot establish suitability or give regulated mortgage advice, so ask a regulated mortgage adviser before applying.

Nearby answers

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Assessed by gpt-5.6-luna (gpt-5.6-luna) on 2026-08-13, second-checked by an independent model. Wrong somewhere? Email [email protected] and it gets re-checked.

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