CekuraBench

Cartesia Sonic 3.5vsDeepgram Aura-2

Cartesia Sonic 3.5Deepgram Aura-2
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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
  • Cartesia Sonic 3.5261 ms · 73.1%
  • Deepgram Aura-2281 ms · 77.2%

Cartesia Sonic 3.5 is better on non-streaming latency. Deepgram Aura-2 is better on 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.

MeasureCartesia Sonic 3.5Deepgram Aura-2
  • Non-streaming latency (median)Cartesia Sonic 3.5 is better261 ms281 ms
  • Streaming latency (median)Deepgram Aura-2 is better244 ms126 ms
  • Extra audio after a stopDeepgram Aura-2 is better809 ms40 ms
  • Hard parts read rightDeepgram Aura-2 is better73.1%77.2%
  • Naturalness (1 to 5)Deepgram Aura-2 is better4.414.43
  • Price per 1M charactersDeepgram Aura-2 is better$39.20$30.00
Hard parts read rightCartesia Sonic 3.5Deepgram Aura-2
  • Numbers and shorthand7 a.m. · 20% · 36°F · approx.69%71%
  • Codes and addressesSAVE20 · help@north-clinic.org · 1-800-555-019975%87%
  • Read from contextSt. Mary's on Main St. · Dr. Okafor54%75%
  • Medical termslevothyroxine · gastroenterology97%86%

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

MeasureCartesia Sonic 3.5Deepgram Aura-2
  • Non-streaming latency (median)8 of 269 of 26
  • Streaming latency (median)10 of 184 of 18
  • Extra audio after a stop6 of 63 of 6
  • Hard parts read right24 of 2620 of 26
  • Naturalness (1 to 5)14 of 268 of 26
  • Price per 1M characters16 of 2513 of 25

Related comparisons

Cartesia Sonic 3.5 vs Deepgram Aura-2 FAQ

  • Cartesia Sonic 3.5. Cartesia Sonic 3.5: 261 ms. Deepgram Aura-2: 281 ms.

  • Deepgram Aura-2. Cartesia Sonic 3.5: 244 ms. Deepgram Aura-2: 126 ms.

  • Deepgram Aura-2. Cartesia Sonic 3.5: 809 ms. Deepgram Aura-2: 40 ms.

  • Deepgram Aura-2. Cartesia Sonic 3.5: 73.1%. Deepgram Aura-2: 77.2%.

  • Deepgram Aura-2. Cartesia Sonic 3.5: $39.20. Deepgram Aura-2: $30.00.