Similarweb Data: ChatGPT Ads Click-Through Rates
On 5 May, Search Engine Roundtable surfaced Similarweb data examining how users actually behave when they encounter ads inside ChatGPT. This is not a hypothetical — OpenAI has been moving toward monetisation, and the question of whether users will click ads inside an AI conversation interface is now measurable, not theoretical. Similarweb's panel data gives a real-world window into that behaviour, tracking what happens after the prompt, after the answer, and after whatever sponsored content appears in the flow. The story is early — one signal, one date — but Similarweb's traffic intelligence has a reasonable track record as an independent data layer, which is why it lands at 72% rather than lower.
If confirmed, here is what this means. Click-through rate data from ChatGPT's ad environment is the number every search advertiser and every Google strategist has been waiting for. If CTRs inside conversational AI are meaningfully different from traditional search — higher because the intent signal is cleaner, or lower because users resist commercial interruption in a dialogue they experience as personal — that single data point reshapes how budgets will move. Agencies will reprice. Google's own ad team will use the comparison as either a warning or a comfort, depending on which direction the numbers run. Publishers who have been quietly watching the AI traffic question from the side will suddenly have a new variable: it is not just whether ChatGPT sends referral clicks, but whether the ads inside it convert at a rate that pulls spend away from the open web. Second-order, this accelerates every conversation about AI-native ad formats — because if the CTR is there, the product roadmap follows fast.
Watch for OpenAI to either confirm or quietly contest the Similarweb figures with their own advertiser-facing metrics — and watch for a second independent data source to either validate or complicate the picture within the next few weeks.
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<p><img alt="ChatGPT traffic analysis: Insights from 17 months of clickstream data"
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<p>A report using Similarweb panel data breaks down ChatGPT ad click-through rates by market and tracks how often the top ChatGPT advertisers changed.</p> <p>The post <a
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