CekuraBench

Soniox TTS RT v2vsMAI-Voice-2.1-Flash

Soniox TTS RT v2MAI-Voice-2.1-Flash
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
  • Soniox TTS RT v2241 ms · 83.6%
  • MAI-Voice-2.1-Flash289 ms · 78.3%

Soniox TTS RT v2 is better on non-streaming latency, streaming latency, stopping, accuracy, naturalness and price.

Last updated Methodology by Dileep Chagam

Which is better at what

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

MeasureSoniox TTS RT v2MAI-Voice-2.1-Flash
  • Non-streaming latency (median)Soniox TTS RT v2 is better241 ms289 ms
  • Streaming latency (median)Soniox TTS RT v2 is better183 msCan't stream
  • Extra audio after a stopSoniox TTS RT v2 is better0 msNo stop message
  • Hard parts read rightSoniox TTS RT v2 is better83.6%78.3%
  • Naturalness (1 to 5)Soniox TTS RT v2 is better4.374.32
  • Price per 1M charactersSoniox TTS RT v2 is better$14.81$15.00
Hard parts read rightSoniox TTS RT v2MAI-Voice-2.1-Flash
  • Numbers and shorthand7 a.m. · 20% · 36°F · approx.78%79%
  • Codes and addressesSAVE20 · help@north-clinic.org · 1-800-555-019986%67%
  • Read from contextSt. Mary's on Main St. · Dr. Okafor88%75%
  • Medical termslevothyroxine · gastroenterology97%92%

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

MeasureSoniox TTS RT v2MAI-Voice-2.1-Flash
  • Non-streaming latency (median)7 of 2612 of 26
  • Streaming latency (median)9 of 18n/a
  • Extra audio after a stop1 of 6n/a
  • Hard parts read right11 of 2618 of 26
  • Naturalness (1 to 5)17 of 2622 of 26
  • Price per 1M characters1 of 252 of 25

Related comparisons

Soniox TTS RT v2 vs MAI-Voice-2.1-Flash FAQ

  • Soniox TTS RT v2. Soniox TTS RT v2: 241 ms. MAI-Voice-2.1-Flash: 289 ms.

  • Soniox TTS RT v2. Soniox TTS RT v2: 183 ms. MAI-Voice-2.1-Flash: Can't stream.

  • Soniox TTS RT v2. Soniox TTS RT v2: 0 ms. MAI-Voice-2.1-Flash: No stop message.

  • Soniox TTS RT v2. Soniox TTS RT v2: 83.6%. MAI-Voice-2.1-Flash: 78.3%.

  • Soniox TTS RT v2. Soniox TTS RT v2: $14.81. MAI-Voice-2.1-Flash: $15.00.