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.

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RankModelMedian LatencyP95 LatencyReal-Time Factor (median)
22
1.3 s
2.8 s
0.11×
21
3.8 s
7.1 s
0.32×
20
1.2 s
2.0 s
0.10×
19
3.6 s
16.7 s
0.29×
18
1.8 s
3.3 s
0.14×
17
1.4 s
3.8 s
0.12×
16
1.0 s
2.0 s
0.09×
15
2.7 s
5.2 s
0.23×
14
0.7 s
2.1 s
0.06×
13
0.4 s
1.3 s
0.04×
12
5.3 s
11.9 s
0.46×
11
3.7 s
6.9 s
0.30×
10
1.0 s
1.8 s
0.09×
09
3.2 s
16.8 s
0.27×
08
1.2 s
3.4 s
0.10×
07mai-transcribe-2Microsoft
0.8 s
1.1 s
0.07×
Accuracy
Word Error Rate (WER)
1.76%#6/22
WER 95% CI (low)
1.56%#6/22
WER 95% CI (high)
1.99%#6/22
Word Accuracy
98.24%#6/22
Character Error Rate (CER)
1.06%#11/22
Strict WER
4.74%#7/22
Match Error Rate (MER)
1.75%#6/22
Word Information Lost (WIL)
2.39%#6/22
Word Information Preserved (WIP)
97.61%#6/22
Error breakdown
Substitution Rate
0.65%#4/22
Deletion Rate
0.51%#10/22
Insertion Rate
0.60%#16/22
Sentence Error Rate (SER)
38.9%#7/22
Exact Match Rate
61.1%#7/22
Length Ratio
1.001×#2/22
Robustness
Mean WER
6.62%#3/22
Median WER
0.00%#1/22
P90 WER
6.09%#5/22
Severe Error Rate
0.2%#3/22
Empty Output Rate
0.0%#1/22
Success Rate
100.0%#1/22
By clip length
WER - short audio (under 5 s)
3.41%#5/22
WER - medium audio (5 to 15 s)
2.06%#6/22
WER - long audio (over 15 s)
1.50%#12/22
Speed
Median Latency
0.8 s#6/22
P95 Latency
1.1 s#1/22
Real-Time Factor (median)
0.07×#6/22
06
1.0 s
1.8 s
0.09×
05
1.8 s
12.2 s
0.15×
04
0.7 s
1.5 s
0.06×
03
1.3 s
1.7 s
0.12×
02
0.6 s
1.3 s
0.06×
01
0.7 s
1.3 s
0.06×
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.

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