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ChatGPT became the fastest app ever to reach 1 billion monthly users — but rivals are closing in

OpenAI's ChatGPT became the fastest app ever to reach the milestone, but Claude and Meta AI are growing their userbases far more quickly

ChatGPT became the fastest app ever to reach 1 billion monthly users — but rivals are closing in

ChatGPT became the fastest app ever to reach 1 billion monthly users — but rivals are closing in

Published June 12, 2026 · Category: Markets

Overview

OpenAI's ChatGPT became the fastest app ever to reach the milestone, but Claude and Meta AI are growing their userbases far more quickly

Source

Originally published at qz.com.

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