Voice AI BenchmarksBy

PROVIDERLAST 30 DAYS

Cloudflare voice AI models and benchmarks

Cloudflare lists 1 TTS model in Coval. Its fastest dated TTS result is Aura 2 En at mean 550 ms time to first audio (29th of 32) among TTS systems, with 2.4% WER. Results cover the last 30 days. Last measured .

Coval measures voice models created or hosted by Cloudflare.

Measured models
1
TTS
Best TTS model#29 / 32
550ms
Aura 2 En

Overview

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
serves Aura 2 En

Text-to-Speech

Full TTS dashboard

Ranked on Time to First Audio against 32 measured models.

Time to First Audioms · lower is better · Cloudflare models markedEvery measured TTS model on Time to First Audio, with Cloudflare's models highlighted.
  1. #1vui54 ms
  2. #2TTS Beta54 ms
  3. #3Qwen3 TTS Fast70 ms
  4. #4TTS Flash 283 ms
  5. #5Qwen3 TTS 1.7b109 ms
  6. #6Palabra TTS v1115 ms
  7. #7TTS 2183 ms
  8. #29Aura 2 En550 ms
leaders plus Cloudflare models · 24 other models in the full table
Word Error Rate% · lower is better · Cloudflare models markedEvery measured TTS model on Word Error Rate, with Cloudflare's models highlighted.
  1. #1Eleven v4 Turbo1.8%
  2. #2Aura 2 En2.4%
  3. #3Qwen3 TTS Fast3.4%
  4. #4TTS RT v14.1%
  5. #5TTS Beta4.1%
  6. #6TTS Rt v24.1%
  7. #7Lightning v3.1 Pro4.3%
leaders plus Cloudflare models · 25 other models in the full table
TTFA vs WER — Cloudflare vs every measured modelEach point is one measured TTS model · Cloudflare models highlighted · 30-day averagesTime to First Audio against Word Error Rate for every measured TTS model, with Cloudflare's models highlighted.
vui — 54 ms, 5.2%TTS Beta — 54 ms, 4.1%Qwen3 TTS Fast — 70 ms, 3.4%TTS Flash 2 — 83 ms, 5.4%Qwen3 TTS 1.7b — 109 ms, 4.6%Palabra TTS v1 — 115 ms, 5.6%TTS 2 — 183 ms, 4.5%Flash v2.5 — 188 ms, 6.4%Eleven v4 Turbo — 203 ms, 1.8%Default — 207 ms, 5.1%Flux TTS — 209 ms, 4.9%TTS Rt v2 — 256 ms, 4.1%TTS RT v1 — 258 ms, 4.1%Mist v3 — 260 ms, 5.4%Phantom Z 3.4 conversational — 273 ms, 5.7%Sonic 3.5 — 285 ms, 5.7%Simba 3.2 — 286 ms, 4.3%Coda — 298 ms, 4.9%Aura 2 — 301 ms, 5.1%Simba 3.0 — 302 ms, 5.2%Eleven v3 Conversational — 325 ms, 4.3%S2.1 Pro — 343 ms, 4.6%Sonic 3.6 — 354 ms, 5.1%Lightning v3.1 Pro — 365 ms, 4.3%S1 — 382 ms, 4.8%Grok TTS — 398 ms, 4.8%Falcon 2 — 521 ms, 5.0%Chirp 3 HD — 545 ms, 5.0%Qwen3 TTS Flash Realtime — 688 ms, 8.5%S2.1 Pro Free — 1003 ms, 4.5%GPT-4o mini TTS — 1185 ms, 4.7%Aura 2 En — 550 ms, 2.4%
Benchmarked models with their Time to First Audio over the last 30 days.
ModelHostTTFARank
Aura 2 EnCloudflare550 ms29th of 32

How fast are Cloudflare's TTS models?

Aura 2 En measures mean 550 ms time to first audio (29th of 32) among TTS systems. Last measured 2026-10-05.

How accurate are Cloudflare's TTS models?

Aura 2 En measures 2.4% word error rate (2nd of 32) among TTS systems. Last measured 2026-10-05.

Which Cloudflare model is fastest?

Its fastest dated TTS result is Aura 2 En at mean 550 ms time to first audio (29th of 32) among TTS systems, with 2.4% WER. Last measured 2026-10-05.

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

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