Fact · Speech recognition
10.3percent word error rate
IBM's own English conversational telephone recognizer reached a word error rate of 10.3 percent on the CallHome subset of the Hub5 2000 evaluation.
Checked against its source on October 17, 2026
In the source's own words
“to the level of 5.5%/10.3% on the Switchboard/CallHome subsets of the Hub5 2000 evaluation”
English Conversational Telephone Speech Recognition by Humans and Machines, George Saon et al., arXiv (cs.CL), IBM Research, 2017, Abstract.
Open the original- What it measures
- The same system and test as the Switchboard figure, on the harder CallHome subset.
- What it does not show
- A research system measured on a standard benchmark, and the figure is for telephone calls only.