Cartesia Ink 2 vs GPT Realtime Whisper
Accuracy and speed
Left gets fewer words wrong. Lower has the final text ready sooner.
- Ink 22.39% · 123ms
- Realtime Whisper2.16% · 543ms
Cartesia Ink 2 is ahead on final-text delay, and GPT Realtime Whisper on time to first text. The two tie on both datasets together. The Pipecat Dataset and The Ocular Dataset are too close to call.
Last updated Methodology by Dileep Chagam
Who is better at what
- Overall WER2.63%2.63%
- Pipecat Dataset WER2.39%2.16%
- Ocular Dataset WER3.09%3.53%
- Time to first text1.51s1.38s
- Final-text delay123ms543ms
Lower is better on every measure. Too close to call means the likely ranges overlap. For its voices, see our notes on Cartesia text to speech.
Ink 2 vs Realtime Whisper FAQ
Which is more accurate, Cartesia Ink 2 or GPT Realtime Whisper?
Cartesia Ink 2 and GPT Realtime Whisper are too close to call on accuracy. On the 1,000 public Pipecat clips, Cartesia Ink 2 scores 2.63% and GPT Realtime Whisper 2.63%, which is a tie. On the eight licensed Ocular recordings, Cartesia Ink 2 scores 2.39% and GPT Realtime Whisper 2.16%, with likely ranges of 2.13 to 2.65% and 1.92 to 2.41%. 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 GPT Realtime Whisper are too close to call on accuracy. On the 1,000 public Pipecat clips, Cartesia Ink 2 scores 2.63% and GPT Realtime Whisper 2.63%, which is a tie. On the eight licensed Ocular recordings, Cartesia Ink 2 scores 2.39% and GPT Realtime Whisper 2.16%, with likely ranges of 2.13 to 2.65% and 1.92 to 2.41%. 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. GPT Realtime Whisper finishes the transcript 132ms sooner. Cartesia Ink 2 has the final transcript 1.51s after the speaker stops and GPT Realtime Whisper 1.38s, at the median. Both are measured on the same 206 streamed turns.
GPT Realtime Whisper finishes the transcript 132ms 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 3.09% and GPT Realtime Whisper after 3.53%, at the median.
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