Fact · Languages and accents
0.063mean match error rate
On spontaneous non-native English from the L2-ARCTIC corpus, RevAI had the best mean match error rate of the five systems tested, at 0.063.
Checked against its source on October 17, 2026
In the source's own words
“For spontaneous speech, RevAI performed best with a mean MER of 0.063.”
Automatic Speech Recognition for Non-Native English: Accuracy and Disfluency Handling, Michael McGuire, arXiv, 2025, Abstract.
Open the original- What it measures
- The spontaneous recordings are narratives from 22 speakers with six first languages: Arabic, Chinese, Hindi, Korean, Spanish and Vietnamese. The study tested five ASR systems, and the best one differed between read and spontaneous speech.
- What it does not show
- Match error rate is not the same measure as word error rate, so these values cannot be read as WER. The sample is 22 narrators, a small group.