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ChatGPT's ad business reached a $1 billion annualized revenue run rate in under 200 days after launch. A pace that took established ad platforms years to match. Advertisers are moving in fast, but most are still building strategy on assumptions borrowed from search and social.
Using Similarweb's real user behavior data, we've put together the first industry-wide ChatGPT Ads playbook, written with our partners at Graphite, covering what's actually working, what isn't, and where ChatGPT ad strategy needs to diverge from traditional channels.
A few of the findings:
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Click-through rate has increased 112% worldwide since ChatGPT ads launched in March 2026.
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Ads placed in the first 4 turns of a conversation see 48% higher CTR than those placed later.
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98% of ChatGPT ad headlines are net-new copy, advertisers are largely not reusing their search ad copy on this channel.
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Best,
Liat Sagiv,
Sr. PMM Ad Intelligence | | | | |
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