Deepgram Flux EnglishvsSoniox STT-RT v5
Accuracy and speed
Left gets fewer words wrong. Lower has the final text ready sooner.
- Flux English3.90% · 108ms
- STT-RT v52.54% · 38ms
Soniox STT-RT v5 is ahead on the Pipecat Dataset and final-text delay, and Deepgram Flux English on time to first text. The Ocular Dataset is too close to call.
Last updated Methodology by Dileep Chagam
Who is better at what
- Pipecat Dataset WER3.90%2.54%
- Ocular Dataset WER4.18%3.92%
- Time to first text791ms1.20s
- Final-text delay108ms38ms
Lower is better on every measure. Too close to call means the likely ranges overlap.
Flux English vs STT-RT v5 FAQ
Which is more accurate, Deepgram Flux English or Soniox STT-RT v5?
Soniox STT-RT v5 is more accurate on the public clips. On the 1,000 public Pipecat clips, Deepgram Flux English scores 3.90% and Soniox STT-RT v5 2.54%, so Soniox STT-RT v5 makes fewer errors by 1.36 points. On the eight licensed Ocular recordings, Deepgram Flux English scores 4.18% and Soniox STT-RT v5 3.92%, with likely ranges of 3.08 to 5.23% 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.
Soniox STT-RT v5 is more accurate on the public clips. On the 1,000 public Pipecat clips, Deepgram Flux English scores 3.90% and Soniox STT-RT v5 2.54%, so Soniox STT-RT v5 makes fewer errors by 1.36 points. On the eight licensed Ocular recordings, Deepgram Flux English scores 4.18% and Soniox STT-RT v5 3.92%, with likely ranges of 3.08 to 5.23% 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 70ms sooner. Deepgram Flux English has the final transcript 108ms 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 70ms 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. Deepgram Flux English shows first text after 791ms and Soniox STT-RT v5 after 1.20s, at the median, so Deepgram Flux English is 404ms sooner.