Can ChatGPT be wrong? How do I know when to check the answer?

ChatGPT is very good at producing language that fits the question and the conversation.

That ability is not the same thing as knowing that every sentence is true.

Sometimes an AI model can produce a plausible answer even when the correct information is uncertain or unavailable. This is often called a:

hallucination

A hallucination is simply an answer that sounds plausible but contains information that is not true.

It is not trying to deceive you. It can simply generate the wrong answer.

Six worth knowing about.

It might give the wrong date, the wrong name, the wrong number or an incorrect specification.

Even simple facts can occasionally be wrong.

Examples: prices, opening hours, laws or regulations, software menus, product features, travel requirements, company policies.

For changing information, current web search and current official sources matter.

Sometimes the AI answers a slightly different question from the one you intended.

You can often fix this by saying:

“That isn’t quite what I meant.”

Then explain the problem another way.

If a question contains missing or uncertain information, AI may sometimes make an assumption. That assumption can then make the rest of the answer wrong.

Useful response:

“Which parts of your answer are assumptions?”

or:

“Tell me what you are uncertain about.”

ChatGPT can work with supported documents, screenshots, images and charts.

But it can still misunderstand small text, unusual formatting, poor-quality images, complicated tables or ambiguous information.

Important documents still deserve human checking.

Even when ChatGPT searches the web and provides citations, do not assume every citation automatically proves every sentence beside it.

A source may be outdated, incomplete, discuss something slightly different, or have been interpreted incorrectly.

For important claims, open the source.

Verification should be proportional to the consequences.

• “Make this sentence friendlier.”
• “Give me ten dinner ideas using chicken and rice.”
• “Turn this list into a table.”
• “Help me think of birthday-card wording.”
• “Make me a packing checklist.”
• “Rewrite this paragraph more clearly.”
• “Give me five names for this project.”

You do not need to turn every conversation with AI into a research project.

Money

Fees, tax information, financial products, payment rules, large purchases.

Health

Medication, symptoms, treatment, dosage, medical decisions — verify with a qualified professional or official source.

Legal or government information

Laws, deadlines, official procedures, immigration, licences, benefits.

Safety

Anything where being wrong could put somebody at risk.

Current information

Opening hours, prices, news, travel rules, product availability, current software instructions.

Important factual claims

Especially exact dates, exact numbers, exact quotations, statistics, names and historical claims.

1. Ask for the source — “Where did that information come from?”
2. If the subject changes frequently, ask ChatGPT to search the web — “Please check the current information online.”
3. Open the source. Do not stop at the citation label.
4. Prefer the original authority. For an Apple setting, use Apple. For a government rule, use the government department. For a bank policy, use the bank. For ChatGPT features, use OpenAI.
5. Check the exact claim — “Does the source actually say what ChatGPT said?”

That is useful — but still look at them when the answer matters.

ChatGPT Search can provide citations and links to web sources, which makes checking much easier.

But OpenAI itself advises reviewing sources because search results and citations can still be incomplete, outdated or incorrect.

The citation is the doorway to the evidence — it is not a guarantee that the AI interpreted the evidence perfectly.

Yes — and it can be useful.

• “Check that answer again.”
• “What part of that answer are you least certain about?”
• “Search the web and verify the important facts.”
• “Show me the official source.”
• “Are you making any assumptions?”

An AI saying “I checked” is not the same as you seeing reliable evidence. If the answer matters, inspect the source.

ChatGPT cannot inspect hidden internal systems or magically know that something is correct simply because you asked twice.

It can sometimes help, but it is not a reliable fact-check by itself.

ChatGPT may give the same correct answer, give the same incorrect answer, change the answer, or discover an earlier mistake.

A better approach for important facts is:

“Search for current authoritative sources and verify this claim.”

Then open the sources.

Do not choose the one you like better.

Disagreement is a useful signal that you should check the evidence.

• What is the original source?
• Which answer is current?
• Are they talking about the same situation?
• Is one making an assumption?

Then use the authoritative source to resolve it.

Yes.

AI models continue to improve, and newer systems can make fewer errors in many situations. But hallucinations have not disappeared.

OpenAI’s own research notes that hallucinations remain a challenge even as models become more capable.

Better AI still requires judgement.

This sounds simple. But opening hours can change because of branch differences, weekends, public holidays or temporary changes.

Better request:

“Search for the current opening hours for this branch tomorrow and show me the bank’s official source.”

Then open the official source before making the trip.

I’m 60 and I use AI every day.

I do not check every sentence it gives me. If I ask it to improve some writing or organise my thoughts, I read the result and use my judgement.

But if it gives me a fact that could cost me money, affect an important decision or depends on something current, I check it.

That small habit lets me get the benefit of AI without pretending it can never be wrong.

— Majdi