Voice AI BenchmarksBy

RIMETEXT-TO-SPEECH51,352 SAMPLES / 30 DAYSLAST RUN AUG 28, 2026, 21:30 UTC

official resource

Coda text-to-speech benchmarks

Coda is a Rime streaming text-to-speech model.

Time to First Audio#12 / 30
313ms
TTFA Network Roundtrip#13 / 28
196ms
TTFA Leading Silence#17 / 28
121ms
Word Error Rate#19 / 30
5.2%

Overview

Rime provides Coda through its real-time synthesis API and offers multilingual and on-premises options.

Coda is tested every day on a fixed set of text prompts, measuring how quickly audible speech starts and how intelligible the result is.

Technical specifications

Made by
Rime
Hosted by
Rime
Source
Official API
Licensing
Proprietary
Deployment
On-prem
Region
US
Features
Multilingual

How Coda ranks

Full TTS dashboard
Time to First Audio — every measured TTS modelMilliseconds · lower is better · 30-day averageEvery TTS model ranked on Time to First Audio, with Coda 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
  8. #8TTS Rt v2262 ms
  9. #9Sonic 3.5274 ms
  10. #10TTS RT v1275 ms
  11. #11Dragon HD Latest310 ms
  12. #12Coda313 ms
Show all 30 models
  1. #13Aura 2328 ms
  2. #14S2.1 Pro374 ms
  3. #15Default384 ms
  4. #16Speech 2.8 Turbo411 ms
  5. #17Eleven v3 Conversational412 ms
  6. #18Grok TTS420 ms
  7. #19S1434 ms
  8. #20Flash v2.5455 ms
  9. #21Speech 2.8 HD460 ms
  10. #22Sonic 3.6466 ms
  11. #23Simba 3.2484 ms
  12. #24Chirp 3 HD512 ms
  13. #25Simba 3.0526 ms
  14. #26Falcon 2549 ms
  15. #27Lightning v3.1 Pro586 ms
  16. #28Qwen3 TTS Flash Realtime645 ms
  17. #29S2.1 Pro Free806 ms
  18. #30GPT-4o mini TTS1075 ms
median of all models · 397 ms
TTS models over the last 30 days, ranked on Time to First Audio.
#ModelHostTTFAWERSamples
1Palabra TTS v1Palabra116 ms5.9%14,396
2vuiFluxions124 ms8,624
3TTS Flash 2Inworld AI128 ms8,719
4TTS 2Inworld AI176 ms4.8%14,529
5BlizzardLmnt235 ms7.4%14,117
6NeuralAzure236 ms4.3%3,350
7Mist v3Rime256 ms6.3%14,524
8TTS Rt v2Soniox262 ms8,849
9Sonic 3.5Cartesia274 ms6.1%14,513
10TTS RT v1Soniox275 ms3.7%14,528
11Dragon HD LatestAzure310 ms5.1%3,350
12CodaRime313 ms5.2%14,523
13Aura 2Deepgram328 ms5.3%14,501
14S2.1 ProFish Audio374 ms10,222
15DefaultGradium384 ms4.6%14,002
16Speech 2.8 TurboMiniMax411 ms4.8%1,997
17Eleven v3 ConversationalElevenLabs412 ms6,750
18Grok TTSxAI420 ms4.7%14,524
19S1Fish Audio434 ms4.9%10,236
20Flash v2.5ElevenLabs455 ms6.7%9,259
21Speech 2.8 HDMiniMax460 ms1,995
22Sonic 3.6Cartesia466 ms560
23Simba 3.2Speechify484 ms4.7%14,525
24Chirp 3 HDGoogle512 ms5.2%14,530
25Simba 3.0Speechify526 ms5.3%14,526
26Falcon 2Murf549 ms10,229
27Lightning v3.1 ProSmallest586 ms4.4%14,515
28Qwen3 TTS Flash RealtimeAlibaba645 ms8.8%14,530
29S2.1 Pro FreeFish Audio806 ms4.7%14,464
30GPT-4o mini TTSOpenAI1075 ms4.8%14,517
Under-sampled models are excluded; tied models share a place. Dotted WER values split into substitutions, deletions and insertions on hover or tap.

Latency vs accuracy

TTFA vs WEREach point is one measured model · Coda highlighted · 30-day averagesTime to First Audio against Word Error Rate for every measured TTS model, with Coda highlighted.
Palabra TTS v1 — 116 ms, 5.9%vui — 124 ms, 7.9%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%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%Coda — 313 ms, 5.2%

Averages and tail latency

Averages hide slow outliers — these are the distributions behind each figure.

Coda latency distributionMilliseconds · shared axis across metrics · last 30 daysCoda's latency percentiles per metric: p25–p75 band, p50 tick, whisker to p99.
  • Time to First Audiop50 310 ms · p99 436 ms
  • TTFA Network Roundtripp50 185 ms · p99 307 ms
  • TTFA Leading Silencep50 126 ms · p99 158 ms
band p25–p75 · tick p50 · whisker to p99 with p90 and p95 stops
Average and percentile values per metric, with the number of samples behind each row.
MetricAveragep25p50p75p90p95p99Samples
Time to First Audio313 ms288 ms310 ms330 ms380 ms402 ms436 ms14,523
TTFA Network Roundtrip196 ms181 ms185 ms200 ms260 ms274 ms307 ms11,153
TTFA Leading Silence121 ms112 ms126 ms136 ms144 ms148 ms158 ms11,153
Word Error Rate5.2%0.0%0.0%9.5%20.0%25.0%35.7%14,523

Last 30 days

Daily medians from the same measurement runs · gaps are days without qualifying runs.

Time to First Audio — daily p50Line p50 · band p25–p75 · UTC daysCoda's daily median Time to First Audio over the last 30 days.
Coda · Jul 31: 311 msCoda · Aug 1: 291 msCoda · Aug 2: 313 msCoda · Aug 3: 279 msCoda · Aug 4: 299 msCoda · Aug 5: 309 msCoda · Aug 6: 286 msCoda · Aug 7: 319 msCoda · Aug 8: 307 msCoda · Aug 9: 302 msCoda · Aug 10: 310 msCoda · Aug 11: 330 msCoda · Aug 12: 300 msCoda · Aug 13: 306 msCoda · Aug 14: 337 msCoda · Aug 15: 309 msCoda · Aug 16: 292 msCoda · Aug 17: 308 msCoda · Aug 18: 311 msCoda · Aug 19: 313 msCoda · Aug 20: 308 msCoda · Aug 21: 319 msCoda · Aug 22: 294 msCoda · Aug 23: 299 msCoda · Aug 24: 325 msCoda · Aug 25: 313 msCoda · Aug 26: 310 msCoda · Aug 27: 318 msCoda · Aug 28: 318 ms
Word Error Rate — daily averageDaily average · UTC daysCoda's daily Word Error Rate over the last 30 days.
Coda · Jul 31: 4.7%Coda · Aug 1: 6.8%Coda · Aug 2: 5.4%Coda · Aug 3: 5.7%Coda · Aug 4: 5.4%Coda · Aug 5: 4.6%Coda · Aug 6: 5.4%Coda · Aug 7: 5.3%Coda · Aug 8: 6.5%Coda · Aug 9: 6.3%Coda · Aug 10: 5.4%Coda · Aug 11: 5.6%Coda · Aug 12: 5.4%Coda · Aug 13: 4.4%Coda · Aug 14: 5.8%Coda · Aug 15: 5.3%Coda · Aug 16: 5.6%Coda · Aug 17: 6.0%Coda · Aug 18: 5.0%Coda · Aug 19: 5.1%Coda · Aug 20: 5.5%Coda · Aug 21: 5.5%Coda · Aug 22: 5.8%Coda · Aug 23: 5.6%Coda · Aug 24: 4.9%Coda · Aug 25: 5.6%Coda · Aug 26: 5.7%Coda · Aug 27: 4.4%Coda · Aug 28: 5.0%

Time to First Audio by dataset

Coda by test conditionMilliseconds · lower is better · best condition firstCoda's Time to First Audio on each benchmark dataset.
  1. Text prompts313 ms
Time to First Audio per dataset, with the number of samples behind each figure.
DatasetTTFASamples
Text prompts313 ms14,523

Strongest condition: Text prompts at 313 ms · weakest: Text prompts at 313 ms.

Limits of this comparison

Coda remains separate from Mist v3 so two Rime generations can be compared on identical prompts without treating the provider as one model.

  • Coval does not score subjective naturalness or every Rime voice; it focuses on audible startup and intelligibility.

Official sources

Results are re-measured daily using fixed datasets and reported over a rolling 30-day window. 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.

Book a Demo