AI wedding planner: what ChatGPT doesn’t know about your wedding

It’s 11 pm and Priya types into ChatGPT: “How many bottles of fizz do we need for the drinks reception?” The answer comes back in three seconds, correct and no use at all: a bottle pours six or seven glasses, allow two or three each, multiply by your guests. How many guests? Priya doesn’t know off the top of her head. She’d have to open the RSVP spreadsheet, count the adults and set aside the three households who still haven’t replied.

A general AI knows a great deal about weddings in general. About yours, it knows what you tell it, and it often forgets between one chat and the next. That’s how these tools are built, and it tells you fairly well what to use them for and when to double-check.

Priya isn’t the only one trying. In the US, The Knot’s annual study of 10,474 couples married in 2025 found that 36% used AI to plan their wedding, nearly twice as many as a year earlier. Most used it to spark ideas, answer early questions and draft messages, then checked the details elsewhere before deciding. We haven’t found an equivalent published study for the UK.

What can ChatGPT do for wedding planning?

Writing. A reminder for slow RSVPs in three different tones. An email asking the florist to move a delivery. A shorter version of your invitation wording. A speech outline built from three stories about the groom. ChatGPT, Gemini and Claude save real time here, as long as you read the result: left alone, they all reach for the same misty-eyed sentence.

• Tightening a text that runs too long or sounds too formal
• Ideas: a theme, table names, something to keep the children busy
• Translating a message for relatives abroad
• A list of questions for your first venue visit
• Summing up a twelve-page supplier contract into the points to check

Where does a general AI get it wrong?

Your numbers, first. To know who hasn’t replied or how far over budget you are, you have to paste in your lists, then do it again next week once three more households have answered. A pasted list is out of date by the morning.

The rules, second. A general AI learnt from text written in every country. Ask about the legal side of a wedding in Manchester and you may get an American marriage license, a Scottish rule or a requirement that changed years ago. In England and Wales, you each give notice at your local register office at least 29 days before the ceremony, having lived in that district for the past seven days, and you need at least two witnesses on the day. In Scotland the process is different, and in the US every state sets its own. An AI that doesn’t know where you’re marrying answers for an average country that doesn’t exist.

Facts, last. Every AI can invent a price, a supplier or a deadline and state it as confidently as a checked fact. Weddy can be wrong too, and his panel says so under every conversation: double-check anything binding, contracts, amounts, dates.

Is it safe to give an AI your guest list?

For a general AI to answer with your numbers, you have to give it the list: names, children, your cousin’s nut allergy. That’s your family’s information, handed to a service whose settings vary from one plan to another. Before you paste a spreadsheet, check whether your chats are used to train the model, and give numbers rather than names where you can.

Weddy runs on Claude, the AI made by Anthropic. He receives a capped summary of your page: your first names, the date, the venues and schedule, how many households replied and how, the names of households who haven’t, the dietary needs flagged, your budget lines. Anthropic says it doesn’t use inputs or outputs from its commercial products, which is what Weddtap uses, to train its models by default. You can delete your conversations in one click, and a conversation about distress or abuse is never kept.

What does an AI assistant that knows your wedding add?

The same kind of question, asked to Weddy by a couple with 24 households invited: “Who hasn’t replied yet?” His answer: “3 households out of 24: the Faircloughs, the Ashworths and the Drummonds. Shall I draft a short, friendly reminder?” Nothing to paste. And Priya’s fizz: 14 adults, two or three glasses each at the reception, one with dessert, so 8 bottles, or 10 if the three missing households turn up.

Weddy keeps it short, three to five sentences, the useful bit first, in British English. He tells you he’s an AI whenever you ask, and his panel says so too: the EU’s AI Act expects people to know when they’re talking to a machine (Article 50). And he doesn’t sell in the conversation: he only mentions Weddtap’s plans if you ask him.

What doesn’t Weddy do?

• He won’t book, pay or write to anyone for you.
• He won’t replace the register office or a solicitor: when something is binding, he tells you who to call.
• He only talks about weddings. Ask about homework, football or politics and he’ll tell you it isn’t his thing, and the question costs you nothing.
• He won’t write a ten-minute speech: his answers are short. For a full speech, a general AI or our guide to the best man and maid of honour speech will take you further.
• He answers 50 questions a day at most, even with The Big Day.

ChatGPT or Weddy: which to use, and for what?

Use both. Keep a general AI for long texts and ideas, and ask Weddy the questions that need your numbers or a rule for England and Wales: who’s coming, what’s left to pay, what you still need to give notice. The simplest test takes two minutes. Ask both the same question, “How many guests have said yes, children included?”, and compare what each one has to ask you before it can answer.

If you’re just starting, the wedding planning timeline sets out the order of decisions, and the wedding drinks calculator does Priya’s maths without any AI, with the method on screen. And for what to ask, stage by stage, 25 AI wedding planning prompts has the list.