Two Platforms Now, Not Three
This comparison started as a three-way choice. By September 2026 it is a two-way one. Perplexity stopped taking new advertisers in October 2025, wound down its remaining ad deals, and by February 2026 had removed sponsored answers from its product, saying ads would make users doubt the answers. ChatGPT went the other way: ads launched in the US in February 2026 and are now bought self-serve in about 40 markets. Google AI Mode carries ads through existing Google Ads campaigns and is testing new AI-native formats announced at Google Marketing Live 2026.
Where Each Platform Stands (September 2026)
| Platform | Status | How you buy | Pricing |
|---|---|---|---|
| Perplexity | No ads. Sponsored answers removed by February 2026; no stated plans to return | Not available | n/a |
| Google AI Mode | Live through existing campaigns; new formats in testing | Google Ads (AI Max for Search, Performance Max, Shopping) | Standard Google Ads auction |
| ChatGPT Ads | Live in about 40 markets on Free and Go tiers | Self-serve Ads Manager (US since May 5, 2026; Europe since August 31, 2026) | CPM and CPC bidding; reported rates below |
ChatGPT Ads: From Pilot to Self-Serve
OpenAI began showing ads to logged-in adult users on the Free and Go tiers in the US on February 9, 2026, with launch advertisers including Target, Williams-Sonoma, and Albertsons. Paid tiers stay ad-free. A self-serve Ads Manager opened in the US on May 5, 2026, added CPC bidding, and dropped the high minimum commitment of the pilot. Rollout reached Canada, Australia, New Zealand, the UK, Mexico, Brazil, Japan, and South Korea, then 31 European markets on August 24, 2026.
Pricing is not published. Advertisers and agencies report CPMs around $60 at launch, settling to roughly $25-60 afterwards, with CPC bids starting around $3-5. Treat those as reported ranges, not rate cards. OpenAI's ad policy says ads do not change ChatGPT's answers, advertisers never see chat content, and ads are excluded from sensitive topics. Full timeline and figures: ChatGPT Ads statistics 2026.
Google AI Mode: Existing Campaigns Plus New Formats
Google serves ads in AI Mode and AI Overviews from existing campaign types rather than a separate product, so any advertiser running Search, Performance Max, or Shopping campaigns with broad reach settings is already eligible. At Google Marketing Live on May 20, 2026, Google announced Conversational Discovery ads and Highlighted Answers (both in testing through AI Max for Search), AI-powered Shopping ads through Performance Max and AI Max for Shopping, and Business Agent for Leads. Details and rollout status: Google AI Mode ad formats 2026.
Feature Comparison
| Dimension | Google AI Mode | ChatGPT Ads | Perplexity |
|---|---|---|---|
| Auction-based | Yes | Yes (CPM and CPC) | No ads |
| Setup | Existing Google Ads account | Separate Ads Manager | n/a |
| Targeting signal | Query intent plus Google audience signals | Conversation topic, plus past chats and memory unless the user turns that off | n/a |
| Who sees ads | Search users in supported markets | Logged-in adults on Free and Go | n/a |
| Best for | Scale, shopping, and teams already on Google Ads | High-intent conversational categories, early-mover share | Organic visibility only |
How to Choose
If you already run Google Ads, AI Mode is the lowest-effort starting point because your campaigns are likely eligible now; the work is checking AI Max and Shopping feed quality. ChatGPT Ads is the new line item worth testing if your category sees lots of research-style questions in ChatGPT, since it is the only way to buy presence inside ChatGPT answers. For Perplexity, the only lever is organic: being cited from sources Perplexity trusts.
The Organic Foundation Still Matters
Paid placement sits next to the answer, not inside it. On all three platforms the answer itself is still organic, so a brand that pays for a slot while the answer recommends a competitor is paying to be the second opinion. Measure organic presence first, then decide where paid fills the gaps.
How Presenc AI Helps
Presenc AI tracks organic brand visibility across ChatGPT, Google AI Mode, Perplexity, and other AI platforms, prompt by prompt. That shows where you are already recommended and where paid ads would only paper over a gap, before you commit budget to either ad platform.