CekuraBench

Deepgram Aura-2vsSoniox TTS RT v2

Deepgram Aura-2Soniox TTS RT v2
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
  • Deepgram Aura-2281 ms · 77.2%
  • Soniox TTS RT v2241 ms · 83.6%

Deepgram Aura-2 is better on streaming latency and naturalness. Soniox TTS RT v2 is better on non-streaming latency, stopping, accuracy and price.

Last updated Methodology by Dileep Chagam

Which is better at what

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

MeasureDeepgram Aura-2Soniox TTS RT v2
  • Non-streaming latency (median)Soniox TTS RT v2 is better281 ms241 ms
  • Streaming latency (median)Deepgram Aura-2 is better126 ms183 ms
  • Extra audio after a stopSoniox TTS RT v2 is better40 ms0 ms
  • Hard parts read rightSoniox TTS RT v2 is better77.2%83.6%
  • Naturalness (1 to 5)Deepgram Aura-2 is better4.434.37
  • Price per 1M charactersSoniox TTS RT v2 is better$30.00$14.81
Hard parts read rightDeepgram Aura-2Soniox TTS RT v2
  • Numbers and shorthand7 a.m. · 20% · 36°F · approx.71%78%
  • Codes and addressesSAVE20 · help@north-clinic.org · 1-800-555-019987%86%
  • Read from contextSt. Mary's on Main St. · Dr. Okafor75%88%
  • Medical termslevothyroxine · gastroenterology86%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

MeasureDeepgram Aura-2Soniox TTS RT v2
  • Non-streaming latency (median)9 of 267 of 26
  • Streaming latency (median)4 of 189 of 18
  • Extra audio after a stop3 of 61 of 6
  • Hard parts read right20 of 2611 of 26
  • Naturalness (1 to 5)8 of 2617 of 26
  • Price per 1M characters13 of 251 of 25

Related comparisons

Deepgram Aura-2 vs Soniox TTS RT v2 FAQ

  • Soniox TTS RT v2. Deepgram Aura-2: 281 ms. Soniox TTS RT v2: 241 ms.

  • Deepgram Aura-2. Deepgram Aura-2: 126 ms. Soniox TTS RT v2: 183 ms.

  • Soniox TTS RT v2. Deepgram Aura-2: 40 ms. Soniox TTS RT v2: 0 ms.

  • Soniox TTS RT v2. Deepgram Aura-2: 77.2%. Soniox TTS RT v2: 83.6%.

  • Soniox TTS RT v2. Deepgram Aura-2: $30.00. Soniox TTS RT v2: $14.81.