Zeke Sikelianos(@zeke):Until yesterday, I knew "perplexity" only as the name of a commercial AI product. Turns out perplexity is also a technical term from the machine learning world: it's a metric that represents how "surprising" the next token is. It can be used to help differentiate human-generated content from AI-generated content. Language models are predictable. Humans are not!

Zeke Sikelianos

@zeke

Artificially intelligent human at @cloudflare. Previously @replicate, @github, @electronjs, @npmjs, @heroku, @wordnik. he/him/they/them

Joined March 2007

519 Following 6.6K Followers

Zeke Sikelianos@zeke

2026.08.20 04:28

Until yesterday, I knew "perplexity" only as the name of a commercial AI product. Turns out perplexity is also a technical term from the machine learning world: it's a metric that represents how "surprising" the next token is. It can be used to help differentiate human-generated content from AI-generated content. Language models are predictable. Humans are not!