An AI answer can sound certain even when a key detail is wrong. Fact-checking therefore starts with a simple rule: confidence in the wording is not evidence of accuracy. The amount of checking you need depends on the consequence of being wrong.
Use a risk-based fact-check
| Claim type | Recommended check |
|---|---|
| Simple low-stakes explanation | Check the main claim if it matters to your task. |
| Current price, date or specification | Check the current official source. |
| Statistic or research finding | Find the original publication or authoritative dataset. |
| Legal, medical or financial guidance | Use authoritative current sources and professional advice where appropriate. |
| Quote or attribution | Locate the original statement and verify the wording and context. |
Step 1: Break the answer into claims
Do not fact-check a long response as one block. Highlight statements that could be independently true or false. For example, a paragraph about a product might contain separate claims about price, release date, features and compatibility.
Step 2: Mark claims that need evidence
Prioritize facts that affect your decision. A general explanation of how a spreadsheet formula works may need less verification than a claim about a current tax rule. Dates, percentages, legal requirements, health claims and named quotations deserve particular attention.
Step 3: Check the source, not just the search snippet
Use the most appropriate original or authoritative source available. If the claim concerns a company's current product, start with the company's documentation. If it concerns a regulation, look for the relevant government or official regulatory source. If it concerns research, locate the original paper or reputable source of the data.
Step 4: Verify numbers separately
Numbers deserve special treatment because one incorrect digit can change the conclusion. Recalculate percentages, totals, rates and unit conversions yourself or with a suitable calculator. Confirm the units and the time period used.
Step 5: Check dates and context
A statement can be accurate but outdated. Ask when the source was published or last updated and whether the rule, product or situation has changed since then. For time-sensitive topics, prefer current primary sources.
Step 6: Test citations
If an AI answer supplies a link or citation, open it. Confirm that the source exists, that the relevant passage supports the claim, and that the AI has not confused a related page with the actual evidence.
Watch for these warning signs
- A precise statistic with no source.
- A quotation that cannot be found in the original material.
- A citation that leads to a page unrelated to the claim.
- Very confident language about an uncertain subject.
- Current information presented without a date.
- Several different claims supported by one vague citation.
- A conclusion that is much stronger than the evidence.
Ask the AI to help with the checking—but keep control
You can ask the model to list every factual claim in its own answer, identify which claims require external verification, or explain what evidence would support each statement. This is useful for building a checklist. It does not turn the model into an independent fact-checker of itself.
A practical fact-check prompt
Extract the factual claims from the answer above.
For each claim, give:
1. the exact claim,
2. why it matters,
3. what type of source should verify it,
4. what would make the claim uncertain.
Do not invent citations. If you cannot verify something from the
provided material, say that it needs external verification.When fact-checking is not enough
If the answer will be used for a high-stakes decision, verification should be broader than checking a few sentences. Use current authoritative information and, where appropriate, a qualified professional. AI can help you prepare questions and organize evidence, but it should not be treated as a replacement for professional judgment.
Fact-check checklist
- □ I separated the answer into individual claims.
- □ I identified the claims that could materially affect the outcome.
- □ I checked important numbers and units.
- □ I verified dates and current status.
- □ I opened the original sources behind important citations.
- □ I checked whether the evidence actually supports the conclusion.
Quick answer
To fact-check an AI answer, break it into individual claims, prioritize the claims that matter, verify them against appropriate original or authoritative sources, recalculate important numbers, check dates and context, and treat AI-generated citations as leads to investigate rather than proof.