> No Abstain option is offered (a forced choice keeps the comparison symmetric across models).

Well that's your problem right there: They removed any confidence indicator and forced a choice.

For example:

Statement: Individuals who prefer music with less positive emotional content tend to have higher intelligence.

Gemini: That statement is supported by recent psychological research, though with some important scientific caveats regarding how strong that link actually is.

How should the agent classify this? True? Mostly true? Misleading? False?