Why is my AI summary inaccurate?

Short answer. A summary is a compression, and compression loses detail. It becomes wrong when the input is poor (unclear audio, overlapping speakers, messy text), when the tool is asked to do more than the input supports (conclusions, numbers, owners), or when it fills a gap with something plausible. You cannot see which has happened from the summary alone, so compare it with the source and make the tool show its evidence. This guide is editorial: we have not tested any tool’s summaries, and we make no claim about a particular product’s accuracy.

Diagnose it

What you see	Plausible causes	How to tell	Simplest fix
A decision or qualifier is missing (“if”, “unless”, “subject to”)	The summary shortened sentences	Search the source for the qualifier near that point	Ask for qualifiers to be kept; add them by hand
A name, number or date is wrong	Mishearing, mistyping or tidying of a figure	Check the audio or original text at that point	Correct by hand; do not send the figure unchecked
An action has the wrong owner	Speakers were mixed up, or the text never named an owner	Listen to the moment; check who spoke	Fix by hand, and name owners explicitly next time
The summary states something nobody said	The tool filled a gap or generalised	Search the source for the claim; if it is absent, it is invented	Delete it. Re-run with “use only the text below”
The summary skips a whole topic	Long input, or the topic came late	Compare the headings of source and summary	Summarise in sections
A source is cited that does not say that	The wording was paraphrased too far	Open the source and read the passage	Quote the passage yourself

A prompt that makes errors easier to find (illustrative)

Summarise the text below in five bullets. Use only the text. For each bullet, give the exact sentence it comes from in quotation marks. Keep every condition (“if”, “unless”, “only when”). List anything you could not determine as a question at the end.

Text: [paste the text]

Replace the text with your own, and keep sensitive material out unless you have read the tool’s data terms. The quotes give you something to check. If the tool cannot quote, treat the bullet as unverified. This prompt is an illustration, not a tested recipe.

A checklist before you rely on a summary

• Every number, date and name matches the source.
• Qualifiers survived.
• Every action has an owner or is marked unowned.
• Nothing appears that you cannot find in the source.
• You could explain each point without the summary.

Reduce the risk

• Give clean input: clear audio, one speaker at a time, tidy text.
• Summarise in sections rather than one long block.
• Ask for evidence (quotes), not just conclusions.
• Keep a person in the loop for anything sent to customers or used in decisions.

When not to use a summary

When the stakes are high (legal, medical, financial or contractual wording), read the source. Use a summary to decide where to look, not as the record.

Related

From call to a follow-up you can trust, web research versus document research tools and the AI content review checklist.