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Original · left

Perplexity (information theory)

First in use: c. 1977
Duplicate · right

Perplexity AI

First in use: c. 2022

Perplexity / Perplexity (information theory) / Perplexity AI

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Duplicate share · 12 mo—
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Colour keyGrey · original meaningGreen · duplicate meaningAmber · contested (40–60%)How colours work

A language-model metric that became a company.

Which meaning of Perplexity is the original, and which one is the duplicate riding on its name? Perplexity (information theory) came first (c. 1977). Perplexity AI arrived in 2022. The data below shows which one owns the word now.

Wikipedia pageviews since 2015

Perplexity (information theory)Perplexity AI
English Wikipedia pageviews since July 2015 load here.

Duplicate's share of attention

Green line = duplicate's % · above 60 it owns the word · below 40 the original does

Share-of-attention line loads here.

The case for each meaning

Sourced definitions, usage stats and quotes

Original · c. 1977

Perplexity (information theory)

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Duplicate · c. 2022

Perplexity AI

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More duplicated terms

AI & machine learning