TTS speed vs accuracy: SpaceXAI hits 87.6% at 106 chars/sec, Kokoro fastest but weakest

ArtificialAnlys · x · 2026-09-22

Artificial Analysis added speed data to its pronunciation robustness benchmark: SpaceXAI TTS reaches 87.6% at 106 characters per second; Realtime TTS-2 Flash runs at 220 chars/sec but scores 77.8%; Kokoro 82M v1.0 is fastest at 242 chars/sec but scores just 55.5%.

Related event: Artificial Analysis Launches TTS Pronunciation Robustness Benchmark; Gemini 3.8 Flash TTS Tops at 89.5%(12 posts)→

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