Pick one checkable fact you'd actually use this week. Ask two different AI tools the identical question. You're done when you've noted match or mismatch — and if they disagree, which real source settles it.
How-to · VER · VER.5
Cross-check one fact across two models
Asking two different models the same factual question and comparing answers is a fast, free reliability check.
Worked example
Two witnesses beat one. When a fact matters, ask a second model the identical question. Agreement doesn't prove truth — but disagreement proves you need a real source. Thirty seconds, and it catches more than you'd think.