ResearchBenchmarksSpeech Synthesis Stability on LibriTTS-R (held-out 500 utterances)Speech Synthesis Stability on LibriTTS-R (held-out 500 utterances)Follow4.1PERgenZero-shot3.6526.6769.712.724Jun 18, 2026Evaluation resultsMethodMethodLinksPERgenZero-shotBackbone=F5-TTSBackbone=F5-TTS2026.064.1LexiconEngine=eSpeak-NGEngine=eSpeak-NG2026.064.1FlowEditSteps=∼50Steps=∼502026.064.1PromptingPrefix tokens=8Prefix tokens=82026.064.2LoRARank (r)=16Rank (r)=162026.066.7Fine-tuningSteps=500Steps=5002026.0615.3