Fact-check an AI answer before reusing it
A persuasive answer can combine accurate facts, irrelevant sources and overconfident conclusions. Verification starts by isolating important claims and tracing them to original documents.
The minimum check
Identify claims that would change your decision. For each, open a primary source, check that it supports the precise statement, review its date and scope, then state the limits of what is established.
- Isolate decisive claims
- Read original sources
- State the limits
A repeatable verification workflow
1. Break up the answer
List definitions, figures, citations, links, recommendations and inferences separately. Prioritise items that affect a decision, expense or publication.
2. Identify the expected source
Find the law, vendor documentation, dataset, original study or official statement relevant to each claim. A page summarising a study is not always enough.
3. Open the document
Check that the link works and the cited passage exists. Read its context, notes, population, method and author caveats.
4. Check time
Record the event date, publication date and last update. For prices, features, office-holders or rules, compare the answer with a current source.
5. Recalculate where needed
Recompute percentages and conversions from source values. Preserve units, comparison bases and periods; an exact decimal does not fix a wrong denominator.
6. Write cautiously
Separate established facts, interpretations and hypotheses. Remove irretrievable citations and explicitly flag points that cannot be confirmed.
Put the method to work
Practical case
Take a five-sentence AI answer about a dated fact and split it into checkable claims.
Evidence to keep
For each claim, record primary source, passage, date, recalculated figure where needed and uncertainty.
Make the decision
Remove or qualify claims without evidence; do not treat a nearby link as verification.
Four reliability signals
Traceability
Does each important claim lead to an accessible source?
Match
Does the source say precisely what the answer claims?
Recency
Does the document cover the relevant period?
Scope
Do the figures and conclusions apply to the right population and place?
Tools for finding original sources
Compare cited search, scholarly research and conventional web search in the directory. References make checking easier, but never replace reading the documents.
Perplexity Search
search with sources
Perplexity · US
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ChatGPT
general assistant
OpenAI · US
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classic web search
Google · US
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Google AI Mode
web search
Google · US
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Claude
long-document analysis
Anthropic · US
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Bing
classic web search
Microsoft · US
Visit official siteHow is this selection produced?
Active services are distributed across guide-related categories, then ordered by editorial highlighting and internal score. This does not assess security, compliance or performance on your use case. Methodology.
Explore tools for this task
- Duck.ai — Explore ideas, rephrase non-sensitive text or compare answers without installing a model. For documentary research, require accessible references instead of treating fluent answers as evidence.
- Kagi — Conduct documentary searches with explicit source preferences. Evaluate coverage of your regular topics before relying on extensive personalization.
- ChatGPT — Prepare a note from two public reports or explore a table with known totals. Specify columns, units, dates and passages to preserve. Writing tasks and calculation tasks require different checks.
- Claude — Prepare texts following one style guide or analyze a reference dossier. Separate background documents, style rules and task-specific instructions so you can understand what influences the output.
- Gemini — Read a report or query a limited set of authorized files. Define whether the answer must cover prose, numerical data or comparisons. Do not confuse file contents with a web search.
- Perplexity Search — Explore a topic, locate documentation or compare arguments across publications. State scope, period and desired source types. Ask for disagreement instead of demanding a single conclusion.
Related tool families
Frequently asked questions
Does a linked citation guarantee a true answer?
No. A real link may fail to support the sentence, point to a secondary source or cover a different period.
Which claims should be checked first?
Those involving health, law, money, safety, figures or an irreversible decision.
What if the original source is unavailable?
Find another primary source. Otherwise attribute the information to a secondary source and lower the stated certainty.
The references below expand on the concepts and checks discussed. Scenarios and trial frameworks remain editorial proposals; provider documentation describes its own product rather than an independent benchmark.
