Cortana was second for questions answered, Alexa second-best for accuracy.
In January, Stone Temple Consulting released a virtual assistant consumer survey showing the majority of respondents wanted the assistants to provide “answers” rather than conventional search results. Today, the firm published a follow-up study that measured the relative accuracy of the four major assistants.
It compared results of “5,000 different questions about everyday factual knowledge” on Google Home, Alexa, Siri and Cortana, using traditional Google search results as a baseline for accuracy. The following table shows the study’s top-line results.
As one might have anticipated, the Google Assistant answered more questions and was correct more often than its rivals. Cortana came in second, followed by Siri and Alexa. Of the questions it could answer, Amazon’s Alexa was the second most accurate assistant. Siri had the highest percentage of wrong answers of the four competitors. (Apple is reportedly “finalizing” its Amazon Echo competitor.)