Cartesia Sonic 3.5vsElevenLabs Flash v2.5
Speed and accuracy
Left is faster. Higher reads more hard parts right.
- Cartesia Sonic 3.5261 ms · 73.1%
- ElevenLabs Flash v2.5182 ms · 64.4%
Cartesia Sonic 3.5 is better on stopping, accuracy, naturalness and price. ElevenLabs Flash v2.5 is better on non-streaming latency and streaming latency.
Last updated Methodology by Dileep Chagam
Which is better at what
Measure by measure, the same sentences, the same place.
- Non-streaming latency (median)ElevenLabs Flash v2.5 is better261 ms182 msElevenLabs Flash v2.5
- Streaming latency (median)ElevenLabs Flash v2.5 is better244 ms177 msElevenLabs Flash v2.5
- Extra audio after a stopCartesia Sonic 3.5 is better809 msFinishes firstCartesia Sonic 3.5
- Hard parts read rightCartesia Sonic 3.5 is better73.1%64.4%Cartesia Sonic 3.5
- Naturalness (1 to 5)Cartesia Sonic 3.5 is better4.414.33Cartesia Sonic 3.5
- Price per 1M charactersCartesia Sonic 3.5 is better$39.20$40.00Cartesia Sonic 3.5
- Numbers and shorthand7 a.m. · 20% · 36°F · approx.69%55%Cartesia Sonic 3.5
- Codes and addressesSAVE20 · help@north-clinic.org · 1-800-555-019975%55%Cartesia Sonic 3.5
- Read from contextSt. Mary's on Main St. · Dr. Okafor54%75%ElevenLabs Flash v2.5
- Medical termslevothyroxine · gastroenterology97%100%ElevenLabs Flash v2.5
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 265 of 26
- Streaming latency (median)10 of 188 of 18
- Extra audio after a stop6 of 6n/a
- Hard parts read right24 of 2626 of 26
- Naturalness (1 to 5)14 of 2621 of 26
- Price per 1M characters16 of 2518 of 25
Cartesia Sonic 3.5 vs ElevenLabs Flash v2.5 FAQ
Which starts talking sooner, Cartesia Sonic 3.5 or ElevenLabs Flash v2.5?
ElevenLabs Flash v2.5. Cartesia Sonic 3.5: 261 ms. ElevenLabs Flash v2.5: 182 ms.
ElevenLabs Flash v2.5. Cartesia Sonic 3.5: 261 ms. ElevenLabs Flash v2.5: 182 ms.
ElevenLabs Flash v2.5. Cartesia Sonic 3.5: 244 ms. ElevenLabs Flash v2.5: 177 ms.
Cartesia Sonic 3.5. Cartesia Sonic 3.5: 809 ms. ElevenLabs Flash v2.5: Finishes first.
Cartesia Sonic 3.5. Cartesia Sonic 3.5: 73.1%. ElevenLabs Flash v2.5: 64.4%.
Cartesia Sonic 3.5. Cartesia Sonic 3.5: $39.20. ElevenLabs Flash v2.5: $40.00.