The arrival of AI-powered answer engines like ChatGPT, Gemini, and Perplexity is profoundly transforming buying journeys and marketing funnels. Where the traditional sales funnel was once structured around three main stages — TOFU, MOFU, BOFU — new user behaviors are now compressing or even merging these phases into a single, instant response.
This shift is reshaping SEO strategies, the role of content, tracking capabilities, and the effectiveness of retargeting. It calls for a complete update of any conversion or inbound marketing strategy.
TOFU / MOFU / BOFU: a reminder of the classic funnel model
The conversion funnel is historically based on the AIDA model (Attention – Interest – Desire – Action), adapted into TOFU / MOFU / BOFU for digital marketing:
- TOFU (Top of Funnel): the awareness stage. The user looks for general information. Typical content: blog posts, definitions, guides.
- MOFU (Middle of Funnel): the evaluation stage. The user starts comparing solutions. Typical content: comparisons, white papers, testimonials.
- BOFU (Bottom of Funnel): the decision stage. The user chooses a solution or product. Typical content: product/service pages, FAQs, forms.
Each stage of this digital marketing funnel corresponds to a specific SEO content type and a clear search intent. It forms a structured, measurable sales journey with key performance indicators (KPIs) tracked via Google Analytics, Google Ads, or other analytics tools.
Before AI: a linear, trackable, and optimizable journey
In the traditional sales funnel, users moved through several stages and web pages. With tracking tools, marketers could monitor behavior (time spent, clicks, bounce rates), identify where users were in their buying journey, and trigger remarketing or automation workflows accordingly.
- TOFU content attracted traffic through SEO and organic search.
- MOFU pages nurtured interest and guided prospects toward conversion.
- BOFU pages converted visitors through well-placed CTAs.
The sales funnel was therefore a measurable, segmented structure that could be optimized step by step.
With AI engines: a funnel compressed into a single answer
Today, a user can interact with an AI engine like ChatGPT or Gemini and get an answer that condenses the entire buying journey:
“Which pellet grill is best for a large family?”
This type of query triggers a response that includes:
- an explanation (TOFU),
- a comparison (MOFU),
- a product or service recommendation (BOFU).
The sales funnel is now absorbed into a single response. The user may no longer need to visit any website at all. This redefines the concept of purchase journey stages and AI-oriented SEO practices.
Impact on tracking, retargeting, and conversion
One of the most critical consequences of this shift is the loss of behavioral data:
- Interactions occur within the AI interface, so no visit is recorded in Google Analytics.
- It’s impossible to trigger retargeting via Google Ads or social networks.
- No pixel can be loaded to capture purchase intent.
In other words, if your page isn’t viewed, you have neither data nor remarketing opportunities. This greatly reduces the potential for conversion rate optimization.
Comparison: before and after AI search engines
| Stage | Traditional SEO funnel | Funnel through AI engines | Strategic consequence |
|---|---|---|---|
| TOFU | SEO-optimized blog post, Google traffic generation | Informative answer integrated into ChatGPT or Perplexity | Create structured, quotable content for AI systems |
| MOFU | Comparisons, expert guides, landing pages | AI-generated summaries based on third-party content | Build authority through link building and brand visibility |
| BOFU | Product page, form, conversion landing page | Call-to-action integrated into AI response | Be identified as the “best solution” in the AI answer |
Rethinking your TOFU / MOFU / BOFU strategy in the AI era
The marketing funnel hasn’t disappeared — it has moved. It now lives within AI interfaces like ChatGPT, meaning SEO content strategies must adapt accordingly.
Here are the key levers to activate:
- Publish TOFU/MOFU content optimized for AI processing (clear schema, strong structure, rich semantics).
- Boost authority through a strong backlink strategy (discover our services).
- Strengthen brand visibility on high-authority platforms (media, forums, expert sources).
- Adapt KPIs to include visibility within AI engines (response presence, prompt testing, offline tracking).
- Structure your offer so it’s clear, recommendable, and understandable from the very first interaction.
An invisible yet decisive funnel
AI engines like ChatGPT haven’t eliminated the sales funnel — they’ve internalized it within a seamless, click-free experience. This requires a digital marketing strategy focused on brand visibility, structured content, and perceived authority. SEO becomes a lever of presence within AI-generated answers, not just in traditional search results.
