Track which brands are advertising inside ChatGPT, how crowded each market is, and how visible different brands are. Free, refreshed weekly.
Adthena has launched the ChatGPT Ads Share of Search Index, a free weekly benchmark of which brands are advertising inside ChatGPT’s sponsored answers. Thousands of distinct advertisers are already active across the US, UK and Australia, and this is the first public index with meaningful UK coverage since ChatGPT ads reached the UK on June 6, 2026. The index shows a ranked visibility leaderboard, per-market saturation, the most contested prompts, and a brand look-up tool.
New brands are entering ChatGPT’s ad auctions every day. New brands are entering ChatGPT’s ad auctions every day. Advertisers, meanwhile, are getting almost no visibility into the competitive landscape forming around them.
In-platform reporting shows you what you bought. It can’t show you who else entered the auction, or how crowded your market just became. In a channel this young, where the auction can change shape in a fortnight, that blind spot is the difference between reacting to a competitor and paying for the privilege of not noticing them.
So what’s the solution?
The ChatGPT Ads Share of Search Index is Adthena’s free weekly benchmark of which brands are advertising inside ChatGPT. It’s a top-level weekly cut of the data layer behind ChatGPT Ads Intelligence, our full competitive product: the index shows you the shape of the market, while the full product tracks every ad, every prompt and every competitor in your category, daily.
Every advertiser we observe, ranked by Visibility %: the share of monitored prompts where that brand’s ad appeared. Filter by market to see who’s winning the US, the UK or Australia specifically. If a competitor is on this board and you aren’t, it’s an obvious gap.
Top ChatGPT advertisers by Visibility %, week of July 13.
How many distinct advertisers are active in each market, and how visible the leaders already are. This is your “how crowded is my pool” number, and it moves week to week as new entrants arrive.
Distinct advertisers and competitive saturation by market
Type any advertiser’s name and get their rank and visibility in seconds. Yours, your competitor’s, or the brand your CFO just asked about.
The index is the free weekly view. ChatGPT Ads Intelligence goes further: daily data on every ad and every competitor in your category, including the detail the public index doesn’t carry. If the index raises a question about your market, the free trial is how you answer it, 21 days, your own category, no commitment.
ChatGPT ads only reached the UK on June 6, 2026, the first expansion beyond the US, Canada, Australia and New Zealand. Public trackers of ChatGPT ads exist, but their volume is overwhelmingly concentrated on US queries.
The index tracks the UK as a first-class market from launch: 1,342 distinct UK advertisers in the week of Jul 13-20, 2026, alongside full US and Australian cuts. If you run UK budgets, this is the first public place you can benchmark the market at all.
Competition on ChatGPT ads is heating up fast, but reporting and insights are still limited. We’ve been diving into this data for a while and it’s great to share initial insights – more coming soon!
Mery Hayles
Adthena
Snr Product Marketing Manager
Adthena’s ChatGPT Ads Intelligence goes even deeper, giving you visibility into the ads and competitors shaping your competitive landscape, refreshed daily.
The UK auction is weeks old, the US one is still forming, and the early-mover window in this channel is open. It won’t stay open.
Start your free trial to see daily ChatGPT ads data for your market.
