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// guide · beginner · 09 Oct 2026

Split a shared cost with an editable ChatGPT splitter

Ask ChatGPT to build an editable cost splitter in the chat, then add up one share by hand.

When different people paid for different parts of a shared day out or holiday, give ChatGPT one prompt listing who came, who paid what, what's shared and how to round. Ask for an editable splitter plus a plain-text who-owes-whom table, change a payment to see the figures move, then add up one person's share by hand before anyone pays.

Steps follow OpenAI's GPT-6 announcement and Help Center page, checked 9 October 2026. The farm park day example is made up.

For planning the half-term week itself, see Plan half-term cover and days out with AI.

Where will the splitter show up?

You need GPT-6 in the Chat tab of ChatGPT. OpenAI's announcement says Intelligent UI (its name for answers that can include buttons, forms, charts and small working tools) started rolling out globally on 7 October 2026 for Plus, Pro, Business and Enterprise, and from 8 October 2026 for Free and Go. On Enterprise, availability also depends on your workspace admin's settings. OpenAI's Help Center page, checked 9 October 2026, still describes GPT-6 as rolling out to eligible paid accounts, so on Free or Go it may not have reached you yet. The same announcement lists a bill splitter among the tools you can ask for.

The Help Center page says Intelligent UI works on the web and in updated mobile apps when you use GPT-6 at Instant through Extra High. OpenAI says it isn't available at Pro effort, and the older ChatGPT desktop apps for macOS and Windows don't support it, so switch to ChatGPT on the web if you use one of those. It has no separate usage quota, and your plan's normal allowances still apply.

What goes in the prompt?

The input is the list of people and every payment. Take the amounts from receipts and booking emails rather than memory, and note who paid each one. Decide before you start what counts as shared: one family's souvenirs or a second round of drinks may not be. First names and amounts are enough, so leave card numbers and bank details out of the chat.

Split by headcount if everyone ate and paid entry, or by household if that's what your group agreed. Put the rule and a rounding rule in the prompt so the splitter and your own check use the same maths.

Fill the brackets and send it in a GPT-6 chat. If an interactive splitter appears, change one payment or move it to a different payer and watch the shares and balances update. OpenAI says ChatGPT picks the format to suit the question and can still answer in plain text, and TechRepublic reports that not every question produces a chart or form, so the splitter may not appear every time. If you get text only, ask once more for an editable splitter. If that still doesn't produce one, the plain-text table at the end of the prompt gives you the same answer to check.

Shared cost splitter with a plain-text fallback
Build me an editable cost splitter in this chat for a shared day out. People (name, and how many are in their group): - [Name]: [number] - [Name]: [number] Payments (who paid, what for, amount in £): - [Name] paid £[amount] for [item] - [Name] paid £[amount] for [item] What counts as shared: [for example, everything above except personal souvenirs]. Leave anything that isn't shared out of the split. Split rule: [by headcount / equally per group]. Rounding: round each group's share to the nearest penny. If the shares don't add up to the shared total, adjust the largest share by the difference and tell me you did. Let me edit the payments and headcounts and see the figures update. For each group, show their share and whether they owe or are owed money. Below the splitter, also give me a plain-text table of who pays whom and how much, using the fewest payments. Under it, show the shared total and the sum of all shares so I can check they match.

Example: a farm park day split by headcount

Four households went to a farm park on Thursday 29 October 2026. Priya brought a family of four and Tom a family of three, while Jess and Dev each came with one child. That's 11 people, and the group agreed to split by headcount.

Priya paid £132.00 for entry and Tom paid £12.00 for parking and £71.35 for lunch. Jess covered £16.80 of ice creams. Dev bought his daughter an £8.00 souvenir, which the group left out of the split, so the shared total is £232.15.

Under the headcount rule and penny rounding, the shares come out at £84.42 for Priya's group and £63.31 for Tom's, with £42.21 each for Jess and Dev. All four add back to £232.15. Against what each paid, Priya is owed £47.58 and Tom £20.04, while Jess owes £25.41 and Dev owes £42.21. The fewest-payments settlement is Dev paying Priya £42.21, and Jess paying Priya £5.37 and Tom £20.04.

Then it turns out Jess paid for the parking. Move the £12.00 from Tom to Jess in the splitter and the shares stay the same, because the shared total hasn't changed. The balances move: Tom is now owed £8.04 and Jess owes £13.41, so her payment to Tom drops from £20.04 to £8.04. Priya and Dev's figures stay as they were. If the splitter doesn't show that change, it isn't recalculating from your edits, so ask for the table again with the corrected payer.

What if you'd rather have plain text?

OpenAI's Help Center says that on ChatGPT on the web you can open Settings and turn off Layout and visuals to reduce visual elements. It also says some visuals may still appear, and that the setting doesn't switch answers to a classic or text-only mode. The page describes the setting for the web only, and TechRepublic's report places it in the web settings too. With it turned off, the who-owes-whom table from the prompt does the whole job.

Add up one share by hand before anyone pays

Neither OpenAI's announcement nor its Help Center page says how reliable the splitter's arithmetic is, and TechRepublic advises checking the figures and calculations in interactive answers. So before anyone sends money, pick one person and work out their figure yourself with a calculator.

For Jess, before the parking change: £132.00 + £12.00 + £71.35 + £16.80 = £232.15 shared, with Dev's souvenir left out. Her group is 2 of the 11 people, so her share is £232.15 × 2 ÷ 11 = £42.2091, which rounds to £42.21. She paid £16.80, so she owes £42.21 − £16.80 = £25.41. That matches her two payments in the settlement: £5.37 + £20.04 = £25.41.

Then check that all the shares add back to the shared total, here £84.42 + £63.31 + £42.21 + £42.21 = £232.15, and that nothing you meant to leave out has crept in. If either check fails, or your person's figure is more than a penny out, fix the input and ask again before anyone pays.

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