50.2 ms P50 time-to-first-audio on Coval; ranked 15th of 112 in the TTS for Voice Agents 2026 index.
Benchmark summary: 47/100, ranked 15th of 112 in the TTS for Voice Agents 2026 index (Contender). Strongest criterion: real-time speed, 44.6 of 60 points.
Fluxions vui is a proprietary text-to-speech (TTS) API from Fluxions, measured by one independent benchmark, Coval.
Overall score
47 /100
Data checked on September 30, 2026
Updated after each benchmark capture
Every point comes from a public benchmark: sources · methodology
Fluxions vui ranks 15th of 112 in the 2026 text-to-speech (TTS) API benchmark, with a score of 47/100.
On Coval's 30-day window ending October 1, 2026 (10,507 runs), Fluxions vui has a P50 (median) time-to-first-audio (TTFA) of 50.2 ms, 2nd lowest of the 31 models Coval measures. Its P99, the slowest 1% of turns, is 128.1 ms (3rd lowest of the 31 models Coval measures). Latency consistency: a standard deviation of 241.6 ms (23rd lowest of the 31 models Coval measures). Mean time to first byte (TTFB) is 30 ms.
Coval measures an accuracy (word error rate) of 5.2% over 10,487 samples on the same window, 20th lowest of the 31 models Coval measures.
Neither Artificial Analysis nor Speko rates its voice quality, so it counts 0 of 20.
No price is published by Artificial Analysis or Speko for this model; price counts 0 of 5.
Rime Coda is a proprietary text-to-speech (TTS) API from Rime, measured by three independent benchmarks: Artificial Analysis, Coval and Speko.
Cartesia Sonic 3.6 is a proprietary text-to-speech (TTS) API from Cartesia, measured by three independent benchmarks: Artificial Analysis, Coval and Speko.
Deepgram Flux TTS is a proprietary text-to-speech (TTS) API from Deepgram, measured by two independent benchmarks: Coval and Speko.