Voice AI BenchmarksBy

PROVIDERLAST 30 DAYS

official resource

Fluxions voice AI models and benchmarks

Fluxions provides Vui, a real-time speech synthesis API with cloning and expressive controls.

Measured models
1
TTS
Best TTS model#2 / 30
124ms
vui

Overview

Fluxions builds and serves a single first-party TTS endpoint.

Every model below is measured daily on the same fixed inputs and ranked against the full field, never blended into a company score.

Model lineup

Text-to-Speech
vui

Text-to-Speech

Full TTS dashboard

Ranked on Time to First Audio against 30 measured models.

Time to First Audioms · lower is better · Fluxions models markedEvery measured TTS model on Time to First Audio, with Fluxions's models highlighted.
  1. #1Palabra TTS v1116 ms
  2. #2vui124 ms
  3. #3TTS Flash 2128 ms
  4. #4TTS 2176 ms
  5. #5Blizzard235 ms
  6. #6Neural236 ms
  7. #7Mist v3256 ms
leaders plus Fluxions models · 23 other models in the full table
Word Error Rate% · lower is better · Fluxions models markedEvery measured TTS model on Word Error Rate, with Fluxions's models highlighted.
  1. #1TTS RT v13.7%
  2. #2TTS Rt v23.9%
  3. #3Neural4.3%
  4. #4Eleven v3 Conversational4.4%
  5. #5Lightning v3.1 Pro4.4%
  6. #6Default4.6%
  7. #7S2.1 Pro4.6%
  8. #29vui7.9%
leaders plus Fluxions models · 22 other models in the full table
TTFA vs WER — Fluxions vs every measured modelEach point is one measured TTS model · Fluxions models highlighted · 30-day averagesTime to First Audio against Word Error Rate for every measured TTS model, with Fluxions's models highlighted.
Palabra TTS v1 — 116 ms, 5.9%TTS Flash 2 — 128 ms, 4.9%TTS 2 — 176 ms, 4.8%Blizzard — 235 ms, 7.4%Neural — 236 ms, 4.3%Mist v3 — 256 ms, 6.3%TTS Rt v2 — 262 ms, 3.9%Sonic 3.5 — 274 ms, 6.1%TTS RT v1 — 275 ms, 3.7%Dragon HD Latest — 310 ms, 5.1%Coda — 313 ms, 5.2%Aura 2 — 328 ms, 5.3%S2.1 Pro — 374 ms, 4.6%Default — 384 ms, 4.6%Speech 2.8 Turbo — 411 ms, 4.8%Eleven v3 Conversational — 412 ms, 4.4%Grok TTS — 420 ms, 4.7%S1 — 434 ms, 4.9%Flash v2.5 — 455 ms, 6.7%Speech 2.8 HD — 460 ms, 4.7%Sonic 3.6 — 466 ms, 5.5%Simba 3.2 — 484 ms, 4.7%Chirp 3 HD — 512 ms, 5.2%Simba 3.0 — 526 ms, 5.3%Falcon 2 — 549 ms, 5.2%Lightning v3.1 Pro — 586 ms, 4.4%Qwen3 TTS Flash Realtime — 645 ms, 8.8%S2.1 Pro Free — 806 ms, 4.7%GPT-4o mini TTS — 1075 ms, 4.8%vui — 124 ms, 7.9%
Benchmarked models with their Time to First Audio over the last 30 days.
ModelHostTTFARank
vuiFluxions124 ms2nd of 30

Limits of this comparison

Fluxions creates and hosts the measured endpoint.

  • The public benchmark measures audible startup and intelligibility, not subjective emotion quality or speaker similarity.

Official resources

Same datasets, prompts and metric definitions for every model, measured by Coval’s open-source runner. Full methodology on the overview.

Evaluate your own voice agent

Use Coval to test your production configuration, prompts and calls—not only the public benchmark endpoints.

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