Cartesia Sonic 3.5vsSoniox TTS RT v2
Speed and accuracy
Left is faster. Higher reads more hard parts right.
- Cartesia Sonic 3.5261 ms · 73.1%
- Soniox TTS RT v2241 ms · 83.6%
Cartesia Sonic 3.5 is better on naturalness. Soniox TTS RT v2 is better on non-streaming latency, 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.
- Non-streaming latency (median)Soniox TTS RT v2 is better261 ms241 msSoniox TTS RT v2
- Streaming latency (median)Soniox TTS RT v2 is better244 ms183 msSoniox TTS RT v2
- Extra audio after a stopSoniox TTS RT v2 is better809 ms0 msSoniox TTS RT v2
- Hard parts read rightSoniox TTS RT v2 is better73.1%83.6%Soniox TTS RT v2
- Naturalness (1 to 5)Cartesia Sonic 3.5 is better4.414.37Cartesia Sonic 3.5
- Price per 1M charactersSoniox TTS RT v2 is better$39.20$14.81Soniox TTS RT v2
- Numbers and shorthand7 a.m. · 20% · 36°F · approx.69%78%Soniox TTS RT v2
- Codes and addressesSAVE20 · help@north-clinic.org · 1-800-555-019975%86%Soniox TTS RT v2
- Read from contextSt. Mary's on Main St. · Dr. Okafor54%88%Soniox TTS RT v2
- Medical termslevothyroxine · gastroenterology97%97%Level
An estimate: speech-to-text transcribers scored it, not people.
Hear both
The same sentence, read by each voice.
- 01A greetingThanks for calling Cedar Valley Family Practice, this is Riley. How can I help you today?
- 02MoneyYour current balance is $1,347.09.
- 03A dateThe order was placed on 2026-03-14 and shipped two days later.
- 04Tracking codeThe tracking number is 1Z 7A4 X29 0341 8867.
- 05Email addressI have m.rivera88@example.org, is that still current?
- 06An Irish nameSiobhan Ó Briain called about the invoice.
How each ranks among all 26
- Non-streaming latency (median)8 of 267 of 26
- Streaming latency (median)10 of 189 of 18
- Extra audio after a stop6 of 61 of 6
- Hard parts read right24 of 2611 of 26
- Naturalness (1 to 5)14 of 2617 of 26
- Price per 1M characters16 of 251 of 25
Cartesia Sonic 3.5 vs Soniox TTS RT v2 FAQ
Which starts talking sooner, Cartesia Sonic 3.5 or Soniox TTS RT v2?
Soniox TTS RT v2. Cartesia Sonic 3.5: 261 ms. Soniox TTS RT v2: 241 ms.
Soniox TTS RT v2. Cartesia Sonic 3.5: 261 ms. Soniox TTS RT v2: 241 ms.
Soniox TTS RT v2. Cartesia Sonic 3.5: 244 ms. Soniox TTS RT v2: 183 ms.
Soniox TTS RT v2. Cartesia Sonic 3.5: 809 ms. Soniox TTS RT v2: 0 ms.
Soniox TTS RT v2. Cartesia Sonic 3.5: 73.1%. Soniox TTS RT v2: 83.6%.
Soniox TTS RT v2. Cartesia Sonic 3.5: $39.20. Soniox TTS RT v2: $14.81.