Google Chirp 3 vs GPT Realtime Whisper
Accuracy and speed
Left gets fewer words wrong. Lower has the final text ready sooner.
- Chirp 32.00% · 475ms
- Realtime Whisper2.16% · 543ms
GPT Realtime Whisper is ahead on both datasets together and time to first text, and Google Chirp 3 on 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
- Overall WER2.76%2.63%
- Pipecat Dataset WER2.00%2.16%
- Ocular Dataset WER4.19%3.53%
- Time to first text4.48s1.38s
- Final-text delay475ms543ms
Lower is better on every measure. Too close to call means the likely ranges overlap. For the wider field, see our pick of the best voice AI APIs for real-time audio.
Chirp 3 vs Realtime Whisper FAQ
Which is more accurate, Google Chirp 3 or GPT Realtime Whisper?
GPT Realtime Whisper is more accurate on the public clips. On the 1,000 public Pipecat clips, Google Chirp 3 scores 2.76% and GPT Realtime Whisper 2.63%, so GPT Realtime Whisper makes fewer errors by 0.13 points. On the eight licensed Ocular recordings, Google Chirp 3 scores 2.00% and GPT Realtime Whisper 2.16%, with likely ranges of 1.77 to 2.25% 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.
GPT Realtime Whisper is more accurate on the public clips. On the 1,000 public Pipecat clips, Google Chirp 3 scores 2.76% and GPT Realtime Whisper 2.63%, so GPT Realtime Whisper makes fewer errors by 0.13 points. On the eight licensed Ocular recordings, Google Chirp 3 scores 2.00% and GPT Realtime Whisper 2.16%, with likely ranges of 1.77 to 2.25% 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 3.10s sooner. Google Chirp 3 has the final transcript 4.48s 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 3.10s 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. Google Chirp 3 shows first text after 4.19% and GPT Realtime Whisper after 3.53%, at the median.
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