PERIT-STT · Leaderboard
Speech recognition, measured against human experts
22 speech-to-text models run on the same real-world audio and scored word by word against transcripts written and reviewed by people.
| Rank | Model | Substitution Rate | Deletion Rate | Insertion Rate | Sentence Error Rate | Exact Match Rate | Length Ratio |
|---|---|---|---|---|---|---|---|
| 22 | voxtral-mini-3b-2507Mistral AI | 0.78% | 0.96% | 2.15% | 44.9% | 55.1% | 1.012× |
| 21 | nemotron-3.5-asr-streaming-multilingual-0.6bNVIDIA | 1.48% | 1.43% | 0.44% | 56.4% | 43.6% | 0.990× |
| 20 | gpt-4o-transcribeOpenAI | 0.69% | 2.12% | 0.36% | 51.8% | 48.2% | 0.982× |
| 19 | whisper-large-v3-turboOpenAI | 0.90% | 0.92% | 0.72% | 50.6% | 49.4% | 0.998× |
| 18 | whisper-1OpenAI | 0.87% | 1.07% | 0.57% | 47.6% | 52.4% | 0.995× |
| 17 | whisper-large-v3OpenAI | 0.89% | 0.95% | 0.54% | 48.2% | 51.8% | 0.996× |
| 16 | voxtral-mini-transcribeMistral AI | 0.77% | 0.92% | 0.47% | 44.8% | 55.2% | 0.996× |
| 15 | voxtral-small-24b-2507-sttMistral AI | 0.73% | 0.92% | 0.49% | 42.9% | 57.1% | 0.996× |
Accuracy
Error breakdown
Robustness
By clip length
Speed
| |||||||
| 14 | parakeet-tdt-0.6b-v3NVIDIA | 0.89% | 0.30% | 0.94% | 46.0% | 54.0% | 1.006× |
| 13 | nova-3Deepgram | 0.85% | 0.72% | 0.55% | 46.0% | 54.0% | 0.998× |
| 12 | chirp-3Google | 0.85% | 0.39% | 0.66% | 40.8% | 59.3% | 1.003× |
| 11 | muse-voice-transcribe-1.0Meta | 0.84% | 0.46% | 0.56% | 39.8% | 60.2% | 1.001× |
| 10 | gpt-4o-mini-transcribeOpenAI | 0.72% | 0.56% | 0.56% | 39.5% | 60.5% | 1.000× |
| 09 | qwen3-asr-0.6bQwen | 0.81% | 0.44% | 0.59% | 39.4% | 60.6% | 1.001× |
| 08 | grok-stt-1.0xAI | 0.78% | 0.35% | 0.64% | 38.9% | 61.1% | 1.003× |
| 07 | mai-transcribe-2Microsoft | 0.65% | 0.51% | 0.60% | 38.9% | 61.1% | 1.001× |
| 06 | gpt-transcribeOpenAI | 0.67% | 0.66% | 0.43% | 38.7% | 61.3% | 0.998× |
| 05 | qwen3-asr-1.7bQwen | 0.67% | 0.35% | 0.58% | 35.5% | 64.5% | 1.002× |
| 04 | transcribe-1Fish Audio | 0.66% | 0.36% | 0.58% | 35.9% | 64.1% | 1.002× |
| 03 | mai-transcribe-1.5Microsoft | 0.63% | 0.26% | 0.68% | 34.5% | 65.5% | 1.004× |
| 02 | universal-3-5-proAssemblyAI | 0.62% | 0.40% | 0.54% | 34.3% | 65.7% | 1.001× |
| 01 | qwen3-asr-flash-2026-02-10Qwen | 0.51% | 0.55% | 0.47% | 33.9% | 66.1% | 0.999× |
Blue marks the best value in each column; a dash means the metric does not apply to that model. Open a model for all 27 metrics and where it places on each.Showing 22 of 22
Best on each axis
The winners, one question at a time.
- Most accurate
- 1.53%Word Error Rate (WER)qwen3-asr-flash-2026-02-10Qwen
- Lowest character error
- 0.87%Character Error Rate (CER)mai-transcribe-1.5Microsoft
- Most exact matches
- 66.1%Exact Match Rateqwen3-asr-flash-2026-02-10Qwen
- Most robust
- 5.72%P90 WERqwen3-asr-flash-2026-02-10Qwen
- Fewest dropped words
- 0.26%Deletion Ratemai-transcribe-1.5Microsoft
- Fewest invented words
- 0.36%Insertion Rategpt-4o-transcribeOpenAI
- Fastest
- 0.4 sMedian Latencynova-3Deepgram
Glossary
What every column means.
Both the reference and the model output go through the same normalization before a single word is counted, so a model is not penalised for writing “2” where the transcriber wrote “two”.
Accuracy
Word- and character-level agreement with the reference, after normalization — and without it.
- Word Error Rate (WER)% · lower is better
- Headline metric. (substituted + deleted + inserted words) / words in the ground truth, after normalization. Pooled across all clips.
- WER 95% CI (low)% · lower is better
- Lower bound of the 95% bootstrap confidence interval for WER.
- WER 95% CI (high)% · lower is better
- Upper bound of the 95% bootstrap confidence interval for WER.
- Word Accuracy% · higher is better
- 100 − WER (floored at 0).
- Character Error Rate (CER)% · lower is better
- Same as WER but counted on characters; more forgiving of near-miss spellings.
- Strict WER% · lower is better
- WER with minimal normalization (only lowercase and punctuation removal). Shows how closely raw output matches the ground-truth style.
- Match Error Rate (MER)% · lower is better
- Errors / (errors + correct words). Bounded at 100% even with heavy hallucination.
- Word Information Lost (WIL)% · lower is better
- Share of word-level information lost between ground truth and output.
- Word Information Preserved (WIP)% · higher is better
- 100 − WIL.
Error breakdown
What kind of mistake a model makes: the wrong word, a dropped word, or an invented one.
- Substitution Rate% · lower is better
- Wrong words, as a share of ground-truth words.
- Deletion Rate% · lower is better
- Missed words (omissions), as a share of ground-truth words.
- Insertion Rate% · lower is better
- Extra words not spoken (fabrications / hallucinations), as a share of ground-truth words.
- Sentence Error Rate (SER)% · lower is better
- Share of clips with at least one word error.
- Exact Match Rate% · higher is better
- Share of clips transcribed perfectly after normalization.
- Length Ratiox · closer to 1 is better
- Output word count / ground-truth word count. Above 1 suggests hallucination, below 1 suggests skipped speech.
Robustness
How the error is spread across clips — the typical one, the hardest tenth, the outright failures.
- Mean WER% · lower is better
- Average of per-clip WER (every clip weighted equally).
- Median WER% · lower is better
- WER of the typical clip.
- P90 WER% · lower is better
- WER on the hardest 10% of clips; measures robustness.
- Severe Error Rate% · lower is better
- Share of clips with WER of 50% or more.
- Empty Output Rate% · lower is better
- Share of clips where the model returned no words.
- Success Rate% · higher is better
- Share of requests that returned a transcript.
By clip length
WER split by clip duration. Short clips give a model the least context to recover from.
- WER - short audio (under 5 s)% · lower is better
- WER on short clips.
- WER - medium audio (5 to 15 s)% · lower is better
- WER on medium-length clips.
- WER - long audio (over 15 s)% · lower is better
- WER on long clips.
Speed
Request time and real-time factor. Measured under concurrent load, so indicative only.
- Median Latencys · lower is better
- Median request time. Measured under concurrent load; indicative only.
- P95 Latencys · lower is better
- 95th percentile request time. Measured under concurrent load; indicative only.
- Real-Time Factor (median)x · lower is better
- Processing time / audio duration. Measured under concurrent load; indicative only.
Want your model on this board?
We run it on the same audio, under the same scoring, and publish it next to the other 22.