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Equation 5 · Ten Failure Modes That Define Multimodal AI Systems

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Δ\Delta

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Δ\Delta

Symbol Δ

the small.

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is the actual multimodal increment — what the removed channel contributed beyond what text alone already bought. A large smultis_{\text{multi}} with a small Δ\Delta is not evidence of multimodal competence; it is evidence that the benchmark, not the model, is doing something unimodal. Reporting Δ\Delta alongside smultis_{\text{multi}} costs one extra evaluation run and turns an unfalsifiable headline number into a checkable one.

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