Inworld STT-1 vs GPT-4o Mini Transcribe
Accuracy and speed
Left gets fewer words wrong. Lower has the final text ready sooner.
- STT-12.72% · 41ms
- 4o Mini Transcribe3.35% · 630ms
Inworld STT-1 is ahead on final-text delay, and GPT-4o Mini Transcribe 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 WER5.44%3.73%
- Pipecat Dataset WER2.72%3.35%
- Ocular Dataset WER10.60%4.45%
- Time to first text1.06sn/a
- Final-text delay41ms630ms
Lower is better on every measure. Too close to call means the likely ranges overlap. Our guide explains how word error rate is measured.
STT-1 vs 4o Mini Transcribe FAQ
Which is more accurate, Inworld STT-1 or GPT-4o Mini Transcribe?
GPT-4o Mini Transcribe is more accurate on the public clips. On the 1,000 public Pipecat clips, Inworld STT-1 scores 5.44% and GPT-4o Mini Transcribe 3.73%, so GPT-4o Mini Transcribe makes fewer errors by 1.71 points. On the eight licensed Ocular recordings, Inworld STT-1 scores 2.72% and GPT-4o Mini Transcribe 3.35%, with likely ranges of 1.67 to 4.68% and 3.08 to 3.65%. 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-4o Mini Transcribe is more accurate on the public clips. On the 1,000 public Pipecat clips, Inworld STT-1 scores 5.44% and GPT-4o Mini Transcribe 3.73%, so GPT-4o Mini Transcribe makes fewer errors by 1.71 points. On the eight licensed Ocular recordings, Inworld STT-1 scores 2.72% and GPT-4o Mini Transcribe 3.35%, with likely ranges of 1.67 to 4.68% and 3.08 to 3.65%. The ranges overlap, so the difference is too close to call. Word error rate counts incorrect, missing, and extra words, so lower is better.
Final-text delay was not measured for one or both, so speed cannot be compared. Both are measured on the same 206 streamed turns.
Inworld STT-1 and GPT-4o Mini Transcribe are level on the two figures a voice agent depends on most. A voice agent cannot reply until the final transcript arrives, and the Ocular recordings are real conversations.
Only Inworld STT-1. GPT-4o Mini Transcribe returns no text until the speaker stops, which matters if your agent reacts to partial transcripts.
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