Cartesia Ink 2vsSoniox STT-RT v5
Accuracy and speed
Left gets fewer words wrong. Lower has the final text ready sooner.
- Ink 22.39% · 123ms
- STT-RT v52.54% · 38ms
Soniox STT-RT v5 is ahead of Cartesia Ink 2 on time to first text and final-text delay. The Pipecat Dataset and The Ocular Dataset are too close to call.
Last updated Methodology by Dileep Chagam
Who is better at what
- Pipecat Dataset WER2.39%2.54%
- Ocular Dataset WER3.09%3.92%
- Time to first text1.51s1.20s
- Final-text delay123ms38ms
Lower is better on every measure. Too close to call means the likely ranges overlap.
Ink 2 vs STT-RT v5 FAQ
Which is more accurate, Cartesia Ink 2 or Soniox STT-RT v5?
Cartesia Ink 2 and Soniox STT-RT v5 are too close to call on accuracy. On the 1,000 public Pipecat clips, Cartesia Ink 2 scores 2.39% and Soniox STT-RT v5 2.54%, with likely ranges of 2.13 to 2.65% and 2.27 to 2.83%. The ranges overlap, so the difference is too close to call. On the eight licensed Ocular recordings, Cartesia Ink 2 scores 3.09% and Soniox STT-RT v5 3.92%, with likely ranges of 2.43 to 3.84% and 2.60 to 4.86%. The ranges overlap, so the difference is too close to call. Word error rate counts incorrect, missing, and extra words, so lower is better.
Cartesia Ink 2 and Soniox STT-RT v5 are too close to call on accuracy. On the 1,000 public Pipecat clips, Cartesia Ink 2 scores 2.39% and Soniox STT-RT v5 2.54%, with likely ranges of 2.13 to 2.65% and 2.27 to 2.83%. The ranges overlap, so the difference is too close to call. On the eight licensed Ocular recordings, Cartesia Ink 2 scores 3.09% and Soniox STT-RT v5 3.92%, with likely ranges of 2.43 to 3.84% and 2.60 to 4.86%. The ranges overlap, so the difference is too close to call. Word error rate counts incorrect, missing, and extra words, so lower is better.
No. Soniox STT-RT v5 finishes the transcript 85ms sooner. Cartesia Ink 2 has the final transcript 123ms after the speaker stops and Soniox STT-RT v5 38ms, at the median. Both are measured on the same 206 streamed turns.
Soniox STT-RT v5 finishes the transcript 85ms sooner, and the two are too close to call on real conversations. A voice agent cannot reply until the final transcript arrives, and the Ocular recordings are real conversations.
Yes, both return partial text before the speaker stops. Cartesia Ink 2 shows first text after 1.51s and Soniox STT-RT v5 after 1.20s, at the median, so Soniox STT-RT v5 is 316ms sooner.