Speed tier
9 text-to-speech (TTS) models, ordered speed first: by speed tier and P95 time to first audio on Coval, then the models Coval does not measure, by name. No combined score.
Data checked on October 22, 2026 · updated after each benchmark capture
9 text-to-speech (TTS) models are in the Fast enough speed tier: P95 from 138 ms to 263 ms on Coval's 30-day window, measured from US East. Fast enough for most agents.
Coval calls each hosted API every 30 minutes and publishes percentiles over 30 days. The tiers group models on the P95 time to first audio, the slowest one turn in twenty, and break where the data has gaps. Within a tier, latencies within 10 ms are a tie. Voice quality, accuracy and price are compared on the model pages, never added into one score.
Alibaba Qwen3 TTS 1.7b is an open-weights text-to-speech (TTS) API from Alibaba (Qwen), served by Baseten, measured by one independent benchmark, Coval.
Deepgram Flux TTS is a proprietary text-to-speech (TTS) API from Deepgram, measured by three independent benchmarks: Artificial Analysis, Coval and Speko.
ElevenLabs Eleven v4 Turbo is a proprietary text-to-speech (TTS) API from ElevenLabs, measured by three independent benchmarks: Artificial Analysis, Coval and Speko.
ElevenLabs Flash v2.5 is a proprietary text-to-speech (TTS) API from ElevenLabs, measured by three independent benchmarks: Artificial Analysis, Coval and Speko.
Fish Audio Drama 3 Preview is an open-weights text-to-speech (TTS) API from Fish Audio, measured by two independent benchmarks: Artificial Analysis and Coval.
Inworld Realtime TTS-2 is a proprietary text-to-speech (TTS) API from Inworld, measured by three independent benchmarks: Artificial Analysis, Coval and Speko.
Palabra TTS v1 is a proprietary text-to-speech (TTS) API from Palabra, measured by two independent benchmarks: Coval and Speko.
SpeechifyAI Simba 3.0 is a proprietary text-to-speech (TTS) API from Speechify, measured by two independent benchmarks: Artificial Analysis and Coval.
SpeechifyAI Simba 3.2 is a proprietary text-to-speech (TTS) API from Speechify, measured by three independent benchmarks: Artificial Analysis, Coval and Speko.