CekuraBench

Fish Audio S2.1-ProvsGrok TTS

Fish Audio S2.1-ProGrok TTS
Compare

Speed and accuracy

Left is faster. Higher reads more hard parts right.

Fast and accurate60%70%80%90%100%00.5s1s1.5s2sTime until the caller hears the voice
  • Fish Audio S2.1-Pro333 ms · 92.0%
  • Grok TTS358 ms · 87.4%

Fish Audio S2.1-Pro is better on non-streaming latency, accuracy and naturalness. Grok TTS is better on streaming latency and stopping.

Last updated Methodology by Dileep Chagam

Which is better at what

Measure by measure, the same sentences, the same place.

MeasureFish Audio S2.1-ProGrok TTS
  • Non-streaming latency (median)Fish Audio S2.1-Pro is better333 ms358 ms
  • Streaming latency (median)Grok TTS is better321 ms157 ms
  • Extra audio after a stopGrok TTS is betterNo stop message0 ms
  • Hard parts read rightFish Audio S2.1-Pro is better92.0%87.4%
  • Naturalness (1 to 5)Fish Audio S2.1-Pro is better4.404.17
  • Price per 1M charactersLevel$15.00$15.00
Hard parts read rightFish Audio S2.1-ProGrok TTS
  • Numbers and shorthand7 a.m. · 20% · 36°F · approx.90%82%
  • Codes and addressesSAVE20 · help@north-clinic.org · 1-800-555-019986%86%
  • Read from contextSt. Mary's on Main St. · Dr. Okafor100%100%
  • Medical termslevothyroxine · gastroenterology100%99%

An estimate: speech-to-text transcribers scored it, not people.

Hear both

The same sentence, read by each voice.

19 sentences, the same for both
  1. 01A greetingThanks for calling Cedar Valley Family Practice, this is Riley. How can I help you today?
  2. 02MoneyYour current balance is $1,347.09.
  3. 03A dateThe order was placed on 2026-03-14 and shipped two days later.
  4. 04Tracking codeThe tracking number is 1Z 7A4 X29 0341 8867.
  5. 05Email addressI have m.rivera88@example.org, is that still current?
  6. 06An Irish nameSiobhan Ó Briain called about the invoice.

How each ranks among all 26

MeasureFish Audio S2.1-ProGrok TTS
  • Non-streaming latency (median)16 of 2618 of 26
  • Streaming latency (median)15 of 187 of 18
  • Extra audio after a stopn/a1 of 6
  • Hard parts read right3 of 268 of 26
  • Naturalness (1 to 5)15 of 2625 of 26
  • Price per 1M characters2 of 252 of 25

Related comparisons

Fish Audio S2.1-Pro vs Grok TTS FAQ

  • Fish Audio S2.1-Pro. Fish Audio S2.1-Pro: 333 ms. Grok TTS: 358 ms.

  • Grok TTS. Fish Audio S2.1-Pro: 321 ms. Grok TTS: 157 ms.

  • Grok TTS. Fish Audio S2.1-Pro: No stop message. Grok TTS: 0 ms.

  • Fish Audio S2.1-Pro. Fish Audio S2.1-Pro: 92.0%. Grok TTS: 87.4%.

  • They are level. Fish Audio S2.1-Pro: $15.00. Grok TTS: $15.00.