CekuraBench

Fish Audio S2.1-ProvsSmallest Lightning v3.1

Fish Audio S2.1-ProSmallest Lightning v3.1
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%
  • Smallest Lightning v3.1357 ms · 81.3%

Fish Audio S2.1-Pro is better on non-streaming latency, streaming latency, accuracy and price. Smallest Lightning v3.1 is better on naturalness.

Last updated Methodology by Dileep Chagam

Which is better at what

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

MeasureFish Audio S2.1-ProSmallest Lightning v3.1
  • Non-streaming latency (median)Fish Audio S2.1-Pro is better333 ms357 ms
  • Streaming latency (median)Fish Audio S2.1-Pro is better321 ms363 ms
  • Extra audio after a stopNo stop messageNo stop message
  • Hard parts read rightFish Audio S2.1-Pro is better92.0%81.3%
  • Naturalness (1 to 5)Smallest Lightning v3.1 is better4.404.49
  • Price per 1M charactersFish Audio S2.1-Pro is better$15.00$19.50
Hard parts read rightFish Audio S2.1-ProSmallest Lightning v3.1
  • Numbers and shorthand7 a.m. · 20% · 36°F · approx.90%78%
  • Codes and addressesSAVE20 · help@north-clinic.org · 1-800-555-019986%81%
  • Read from contextSt. Mary's on Main St. · Dr. Okafor100%75%
  • Medical termslevothyroxine · gastroenterology100%97%

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-ProSmallest Lightning v3.1
  • Non-streaming latency (median)16 of 2617 of 26
  • Streaming latency (median)15 of 1816 of 18
  • Extra audio after a stopn/an/a
  • Hard parts read right3 of 2614 of 26
  • Naturalness (1 to 5)15 of 264 of 26
  • Price per 1M characters2 of 257 of 25

Related comparisons

Fish Audio S2.1-Pro vs Smallest Lightning v3.1 FAQ

  • Fish Audio S2.1-Pro. Fish Audio S2.1-Pro: 333 ms. Smallest Lightning v3.1: 357 ms.

  • Fish Audio S2.1-Pro. Fish Audio S2.1-Pro: 321 ms. Smallest Lightning v3.1: 363 ms.

  • Neither has a figure. Fish Audio S2.1-Pro: No stop message. Smallest Lightning v3.1: No stop message.

  • Fish Audio S2.1-Pro. Fish Audio S2.1-Pro: 92.0%. Smallest Lightning v3.1: 81.3%.

  • Fish Audio S2.1-Pro. Fish Audio S2.1-Pro: $15.00. Smallest Lightning v3.1: $19.50.