AssemblyAI Universal 3.5 Pro vs Google Chirp 3
Accuracy and speed
Left gets fewer words wrong. Lower has the final text ready sooner.
- Universal 3.5 Pro1.93% · 180ms
- Chirp 32.00% · 475ms
AssemblyAI Universal 3.5 Pro is ahead of Google Chirp 3 on both datasets together, time to first text and final-text delay. The Pipecat Dataset and The Ocular Dataset are too close to call. AssemblyAI Universal 3.5 Pro has a newer release: AssemblyAI Universal 3.6 Pro vs Google Chirp 3.
Last updated Methodology by Dileep Chagam
Who is better at what
- Overall WER2.72%2.76%
- Pipecat Dataset WER1.93%2.00%
- Ocular Dataset WER4.23%4.19%
- Time to first text489ms4.48s
- Final-text delay180ms475ms
Lower is better on every measure. Too close to call means the likely ranges overlap.
Universal 3.5 Pro vs Chirp 3 FAQ
Which is more accurate, AssemblyAI Universal 3.5 Pro or Google Chirp 3?
AssemblyAI Universal 3.5 Pro is more accurate on the public clips. On the 1,000 public Pipecat clips, AssemblyAI Universal 3.5 Pro scores 2.72% and Google Chirp 3 2.76%, so AssemblyAI Universal 3.5 Pro makes fewer errors by 0.04 points. On the eight licensed Ocular recordings, AssemblyAI Universal 3.5 Pro scores 1.93% and Google Chirp 3 2.00%, with likely ranges of 1.69 to 2.18% and 1.77 to 2.25%. The ranges overlap, so the difference is too close to call. Word error rate counts incorrect, missing, and extra words, so lower is better.
AssemblyAI Universal 3.5 Pro is more accurate on the public clips. On the 1,000 public Pipecat clips, AssemblyAI Universal 3.5 Pro scores 2.72% and Google Chirp 3 2.76%, so AssemblyAI Universal 3.5 Pro makes fewer errors by 0.04 points. On the eight licensed Ocular recordings, AssemblyAI Universal 3.5 Pro scores 1.93% and Google Chirp 3 2.00%, with likely ranges of 1.69 to 2.18% and 1.77 to 2.25%. The ranges overlap, so the difference is too close to call. Word error rate counts incorrect, missing, and extra words, so lower is better.
Yes. AssemblyAI Universal 3.5 Pro finishes the transcript 3.99s sooner. AssemblyAI Universal 3.5 Pro has the final transcript 489ms after the speaker stops and Google Chirp 3 4.48s, at the median. Both are measured on the same 206 streamed turns.
AssemblyAI Universal 3.5 Pro finishes the transcript 3.99s 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. AssemblyAI Universal 3.5 Pro shows first text after 4.23% and Google Chirp 3 after 4.19%, at the median.
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