GPT Realtime Whisper vs Reson8 Rumble-2
Accuracy and speed
Left gets fewer words wrong. Lower has the final text ready sooner.
- Realtime Whisper2.16% · 543ms
- Rumble-21.69% · 18ms
Reson8 Rumble-2 is ahead of GPT Realtime Whisper on both datasets together, the Pipecat Dataset, time to first text and final-text delay. The Ocular Dataset is too close to call.
Last updated Methodology by Dileep Chagam
Who is better at what
- Overall WER2.63%2.05%
- Pipecat Dataset WER2.16%1.69%
- Ocular Dataset WER3.53%2.75%
- Time to first text1.38s486ms
- Final-text delay543ms18ms
Lower is better on every measure. Too close to call means the likely ranges overlap.
Realtime Whisper vs Rumble-2 FAQ
Which is more accurate, GPT Realtime Whisper or Reson8 Rumble-2?
Reson8 Rumble-2 is more accurate on both datasets. On the 1,000 public Pipecat clips, GPT Realtime Whisper scores 2.63% and Reson8 Rumble-2 2.05%, so Reson8 Rumble-2 makes fewer errors by 0.57 points. On the 300 licensed Ocular turns, GPT Realtime Whisper scores 2.16% and Reson8 Rumble-2 1.69%, so Reson8 Rumble-2 makes fewer errors by 0.47 points. Word error rate counts incorrect, missing, and extra words, so lower is better.
Reson8 Rumble-2 is more accurate on both datasets. On the 1,000 public Pipecat clips, GPT Realtime Whisper scores 2.63% and Reson8 Rumble-2 2.05%, so Reson8 Rumble-2 makes fewer errors by 0.57 points. On the 300 licensed Ocular turns, GPT Realtime Whisper scores 2.16% and Reson8 Rumble-2 1.69%, so Reson8 Rumble-2 makes fewer errors by 0.47 points. Word error rate counts incorrect, missing, and extra words, so lower is better.
No. Reson8 Rumble-2 finishes the transcript 893ms sooner. GPT Realtime Whisper has the final transcript 1.38s after the speaker stops and Reson8 Rumble-2 486ms, at the median. Both are measured on the same 206 streamed turns.
Reson8 Rumble-2 is the stronger pick for voice agents: it makes fewer errors on real conversations and finishes the transcript 893ms sooner. 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. GPT Realtime Whisper shows first text after 3.53% and Reson8 Rumble-2 after 2.75%, at the median.
Test your voice agent the same way.
Cekura runs these simulated calls on your agent and scores every one.