Voice AI BenchmarksBy

GOOGLETEXT-TO-SPEECH7,678 SAMPLES / 30 DAYSLAST RUN OCT 14, 2026, 16:30 UTC

official resource

Chirp 3 HD text-to-speech benchmarks

Chirp 3 HD, hosted by Google, measures mean 597 ms time to first audio (29th of 32) and 1.5% word error rate (7th of 32) among TTS systems. Results cover the last 30 days. Coval benchmarks hosted endpoints daily using a consistent evaluation methodology. Last measured .

Chirp 3 HD is Google Cloud's high-definition generative text-to-speech family.

Time to First Audio#29 / 32
597ms
TTFA Network Roundtrip#21 / 32
192ms
TTFA Leading Silence#32 / 32
406ms
Word Error Rate#7 / 32
1.5%

Overview

Chirp 3 HD voices ship in Cloud Text-to-Speech with multilingual coverage and first-party hosting.

Chirp 3 HD 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
Google
Hosted by
Google
Source
Official API
Licensing
Proprietary
Deployment
Cloud
Region
US
Features
Multilingual

How Chirp 3 HD 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 Chirp 3 HD highlighted.
  1. #1vui59 ms
  2. #2Default63 ms
  3. #3Qwen3 TTS Fast68 ms
  4. #4TTS Flash 291 ms
  5. #5Qwen3 TTS 1.7b107 ms
  6. #6Simba 3.0111 ms
  7. #7Palabra TTS120 ms
  8. #8Simba 3.2126 ms
  9. #9drama3-preview167 ms
  10. #10TTS 2191 ms
  11. #11Flash v2.5192 ms
  12. #12Eleven v4 Turbo201 ms
  13. #13Flux TTS205 ms
  14. #14TTS RT v1255 ms
  15. #15TTS Rt v2256 ms
  16. #16Mist v3287 ms
  17. #17Phantom Z 3.4 conversational291 ms
  18. #18Sonic 3.5293 ms
  19. #19Aura 2297 ms
  20. #20Sonic 3.6299 ms
  21. #21Falcon 2299 ms
  22. #22Coda332 ms
  23. #23S2.1 Pro341 ms
  24. #24Grok TTS363 ms
  25. #25S1389 ms
  26. #26Lightning v3.1 Pro392 ms
  27. #27Daytona TTS486 ms
  28. #28Aura 2 En570 ms
  29. #29Chirp 3 HD597 ms
Show all 32 models
  1. #30Qwen3 TTS Flash Realtime718 ms
  2. #31S2.1 Pro Free849 ms
  3. #32GPT-4o mini TTS2585 ms
median of all models · 289 ms
TTS models over the last 30 days, ranked on Time to First Audio.
#ModelHostTTFAWERSamples
1vuiFluxions59 ms1,748
2Gradium TTS Beta 202609Gradium63 ms1,920
3Qwen3 TTS FastNari Labs68 ms1,920
4TTS Flash 2Inworld AI91 ms1,724
5Qwen3 TTS 1.7bBaseten107 ms1,248
6Simba 3.0SpeechifyAI111 ms1,919
7Palabra TTS v1Palabra120 ms1,580
8Simba 3.2SpeechifyAI126 ms1,916
9Drama 3 Preview Us EastFish Audio167 ms166
10TTS 2Inworld AI191 ms1,724
11Flash v2.5ElevenLabs192 ms1,910
12Eleven v4 TurboElevenLabs201 ms1,230
13Flux TTSDeepgram205 ms1,783
14TTS RT v1Soniox255 ms1,622
15TTS Rt v2Soniox256 ms1,619
16Mist v3Rime287 ms602
17Phantom Z 3.4 conversationalDeepdub291 ms1,655
18Sonic 3.5Cartesia293 ms1,920
19Aura 2Deepgram297 ms1,852
20Sonic 3.6Cartesia299 ms1,920
21Falcon 2Murf299 ms1,919
22CodaRime332 ms602
23S2.1 ProFish Audio341 ms1,920
24Grok TTSSpaceXAI363 ms1,915
25S1Fish Audio389 ms1,919
26Lightning v3.1 ProSmallest392 ms1,920
27Daytona TTSGuava486 ms1,152
28Aura 2 EnCloudflare570 ms1,919
29Chirp 3 HDGoogle597 ms1,920
30Qwen3 TTS Flash RealtimeAlibaba718 ms1,919
31S2.1 Pro FreeFish Audio849 ms1,913
32GPT-4o mini TTSOpenAI2585 ms1,846
Under-sampled models are excluded; tied models share a place. Dotted WER values split into substitutions, deletions and insertions on hover or tap.

Highest relative placement: 7th of 32 on Word Error Rate.

Latency vs accuracy

TTFA vs WEREach point is one measured model · Chirp 3 HD highlighted · 30-day averagesTime to First Audio against Word Error Rate for every measured TTS model, with Chirp 3 HD highlighted.
vui — 59 ms, 2.1%Default — 63 ms, 1.9%Qwen3 TTS Fast — 68 ms, 1.8%TTS Flash 2 — 91 ms, 1.7%Qwen3 TTS 1.7b — 107 ms, 1.8%Simba 3.0 — 111 ms, 1.5%Palabra TTS — 120 ms, 2.6%Simba 3.2 — 126 ms, 1.9%drama3-preview — 167 ms, 2.0%TTS 2 — 191 ms, 1.6%Flash v2.5 — 192 ms, 1.8%Eleven v4 Turbo — 201 ms, 1.7%Flux TTS — 205 ms, 1.7%TTS RT v1 — 255 ms, 2.4%TTS Rt v2 — 256 ms, 2.4%Mist v3 — 287 ms, 2.1%Phantom Z 3.4 conversational — 291 ms, 1.8%Sonic 3.5 — 293 ms, 1.5%Aura 2 — 297 ms, 1.8%Sonic 3.6 — 299 ms, 1.5%Falcon 2 — 299 ms, 1.7%Coda — 332 ms, 9.5%S2.1 Pro — 341 ms, 1.5%Grok TTS — 363 ms, 1.6%S1 — 389 ms, 1.8%Lightning v3.1 Pro — 392 ms, 1.5%Daytona TTS — 486 ms, 1.6%Aura 2 En — 570 ms, 2.1%Qwen3 TTS Flash Realtime — 718 ms, 3.0%S2.1 Pro Free — 849 ms, 1.5%GPT-4o mini TTS — 2585 ms, 1.8%Chirp 3 HD — 597 ms, 1.5%

Where the errors come from

WER compositionChirp 3 HD's Word Error Rate split by error type · 30-day averageChirp 3 HD's WER split into substitutions, deletions and insertions.
  • Chirp 3 HD1.5%
SubstitutionsDeletionsInsertions

Averages and tail latency

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

Chirp 3 HD latency distributionMilliseconds · shared axis across metrics · last 30 daysChirp 3 HD's latency percentiles per metric: p25–p75 band, p50 tick, whisker to max.
  • Time to First Audiop50 537 ms · Max 3687 ms
  • TTFA Network Roundtripp50 154 ms · Max 3136 ms
  • TTFA Leading Silencep50 369 ms · Max 986 ms
band p25–p75 · tick p50 · whisker to max with p90 and p95 stops
Average and percentile values per metric, with the number of samples behind each row.
MetricAveragep25p50p75p90p95MaxSamples
Time to First Audio597 ms474 ms537 ms694 ms861 ms938 ms3687 ms1,920
TTFA Network Roundtrip192 ms139 ms154 ms192 ms223 ms373 ms3136 ms1,920
TTFA Leading Silence406 ms313 ms369 ms461 ms666 ms713 ms986 ms1,920
Word Error Rate1.5%0.0%0.0%1.9%6.9%11.8%43.8%1,918

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 daysChirp 3 HD's daily median Time to First Audio over the last 30 days.
Chirp 3 HD · Sep 23: 762 msChirp 3 HD · Sep 24: 540 msChirp 3 HD · Sep 25: 479 msChirp 3 HD · Sep 26: 643 msChirp 3 HD · Sep 27: 631 msChirp 3 HD · Sep 28: 873 msChirp 3 HD · Sep 29: 478 msChirp 3 HD · Sep 30: 617 msChirp 3 HD · Oct 1: 474 msChirp 3 HD · Oct 2: 766 msChirp 3 HD · Oct 3: 499 msChirp 3 HD · Oct 4: 574 msChirp 3 HD · Oct 5: 724 msChirp 3 HD · Oct 6: 486 msChirp 3 HD · Oct 7: 572 msChirp 3 HD · Oct 8: 547 msChirp 3 HD · Oct 9: 563 msChirp 3 HD · Oct 10: 623 msChirp 3 HD · Oct 11: 617 msChirp 3 HD · Oct 12: 694 msChirp 3 HD · Oct 13: 523 msChirp 3 HD · Oct 14: 526 ms
Word Error Rate — daily averageDaily average · UTC daysChirp 3 HD's daily Word Error Rate over the last 30 days.
Chirp 3 HD · Sep 23: 4.7%Chirp 3 HD · Sep 24: 2.1%Chirp 3 HD · Sep 25: 4.4%Chirp 3 HD · Sep 26: 3.7%Chirp 3 HD · Sep 27: 3.9%Chirp 3 HD · Sep 28: 3.8%Chirp 3 HD · Sep 29: 2.9%Chirp 3 HD · Sep 30: 1.7%Chirp 3 HD · Oct 1: 4.8%Chirp 3 HD · Oct 2: 4.0%Chirp 3 HD · Oct 3: 5.5%Chirp 3 HD · Oct 4: 7.2%Chirp 3 HD · Oct 5: 2.2%Chirp 3 HD · Oct 6: 6.4%Chirp 3 HD · Oct 7: 4.8%Chirp 3 HD · Oct 8: 5.3%Chirp 3 HD · Oct 9: 3.0%Chirp 3 HD · Oct 10: 2.1%Chirp 3 HD · Oct 11: 2.8%Chirp 3 HD · Oct 12: 5.3%Chirp 3 HD · Oct 13: 4.7%Chirp 3 HD · Oct 14: 6.0%

How fast is Chirp 3 HD?

On Google, Chirp 3 HD measures mean 597 ms time to first audio (29th of 32). Last measured 2026-10-14.

How accurate is Chirp 3 HD?

On Google, Chirp 3 HD measures 1.5% word error rate (7th of 32). Last measured 2026-10-14.

Who hosts Chirp 3 HD?

Chirp 3 HD is created by Google and served by Google. Coval measures each hosted endpoint separately.

Limits of this comparison

Coval measures a configured Cloud voice as a distinct endpoint and compares it with other managed synthesis APIs.

  • The family contains multiple voices and languages; these results apply to Coval's configured voice, not every Chirp 3 HD voice.

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