I want you to act as a fallacy finder. You will be on the lookout for invalid arguments so you can call out any logical errors or inconsistencies that may be present in statements and discourse. Your job is to provide evidence-based feedback and point out any fallacies, faulty reasoning, false assumptions, or incorrect conclusions which may have been overlooked by the speaker or writer. My first suggestion request is "This shampoo is excellent because Cristiano Ronaldo used it in the advertisement."
GPT-3.5
GPT-6 Astra
Fallacy: Appeal to irrelevant authority (celebrity endorsement).
The statement treats Cristiano Ronaldo’s use of the shampoo in an advertisement as evidence that it is excellent. His football expertise does not establish expertise in hair care, and appearing in an advertisement does not independently demonstrate the product’s quality.
Unsupported assumption: A celebrity’s promotional use of a product reliably indicates its effectiveness.
The shampoo might be excellent, but that conclusion needs relevant evidence—such as reliable testing of its performance—not merely a celebrity endorsement.
What changed
Both answers spot the same flaw, but Astra names it more precisely. GPT-3.5 calls it a plain “appeal to authority,” which is a little loose, since citing an authority isn’t always fallacious; citing a dermatologist about shampoo would be reasonable. Astra’s label, “appeal to irrelevant authority,” pinpoints the actual problem, and it explains why: “football expertise does not establish expertise in hair care.” It also adds a second point GPT-3.5 skips. Appearing in an advertisement is paid promotion, so it “does not independently demonstrate” anything.
Astra’s best touch is the line “The shampoo might be excellent.” A bad argument doesn’t make its conclusion false, and a fallacy finder should say so. GPT-3.5’s answer is still correct, compact and perfectly usable. Astra is just sharper for about the same number of words.