AI and the Compressed Buying Funnel: What Does It Mean for Paid Channels?

The B2B buying journey has always been complex. Multiple stakeholders, long timelines and a decision process that rarely follows a straight line. But something has shifted… and fast. AI is compressing the early stages of that journey in ways that most paid media strategies haven't caught up with yet.

Here's what that means for B2B paid channels.

The funnel hasn't disappeared. It's just moved somewhere you can't track.

The traditional buying funnel assumed buyers would move through awareness, consideration and evaluation in a way that was at least partially visible to marketers. AI has changed that.

Today, 94% of B2B buyers use AI tools during the purchasing process (1), and B2B buyers now complete around 70% of their buying journey through self-directed research before ever engaging a vendor directly (2) - AI conversations, peer networks, review platforms. Buyers are doing more research faster, and before they ever engage with a brand directly.

By the time a prospect surfaces in your funnel, they've often already made up their mind. 6sense's research found that 95% of the time, the winning vendor was already on the buyer's "Day One" shortlist before any first contact was made and that the vendor a buyer contacts first wins the deal around 80% of the time. (3)

That creates an uncomfortable reality: a channel that's always been relied on to deliver measurable pipeline is suddenly much harder to measure. Not because paid media has stopped working, but because so much of the decision is now made before it gets the chance to prove it.

This isn't a reason to panic. But it is a reason to rethink where paid media earns its value.

The buying committee is bigger and harder to reach

AI is accelerating the research phase while simultaneously creating new complexity in the decision phase.

• The average B2B buying committee now includes 13 internal stakeholders and 9 external participants. (4)
• Buying cycles have compressed from 11.3 months in 2024 to 10.1 months in 2025. (5)
• 86% of B2B purchases still stall, during the process - driven less by lack of interest than by budget pressure and the complexity of buyers' own internal purchasing processes. (6)

For paid media, this creates a dual challenge: reaching buyers earlier, before they've formed a view, and reaching enough of the right people to influence the final decision.

Why LinkedIn holds up, but the strategy has to change

In this environment, LinkedIn remains the B2B paid channel with the strongest fundamentals. It reaches 63 million decision-makers, including 10 million C-level executives. (7) LinkedIn's own data shows a 33% increase in purchase intent from ad exposure (8) and at the lead level, cost per lead runs roughly 28% lower than paid search. (9)

But the way you use it needs to evolve.

When buyers are forming views through AI, LinkedIn's role shifts from demand capture to brand authority-building. The goal is to be on the shortlist before the shortlist is even written.

That means three things need to change in how paid social is planned and executed:

1. Lead with thought leadership, not product. AI research tools surface authoritative, expert content. Campaigns that lead with genuine insight, not product claims, build the brand credibility that shapes AI-era shortlisting. LinkedIn paid performance increasingly rewards brands that show up as trusted voices, not just advertisers.
2. Plan for the committee, not just the persona. With 13+ stakeholders in the average buying decision, reaching one job title leaves most of the committee untouched. Messaging needs to resonate across finance, IT, operations and leadership - and buyers typically consume 7 to 10 pieces of content before making their choice. (9) Narrow audience targeting won't get you there.
3. Use trust signals as a creative strategy. 69% of B2B buyers still rely on sales reps to validate insights they've generated through AI. (10) That validation instinct shows up in paid media too. Case studies, client logos, third-party recognition and peer proof aren't just supporting assets, they're doing active work in compressing the evaluation phase.

The measurement conversation you need to have now

One of the harder implications of the AI-influenced funnel is what it does to attribution. CTR and CPC are still healthy for most of our clients - the mechanics of the auction haven't changed and good creative still earns a click. What's changed is what that click means. When a buyer has already done most of their research through AI tools and peer conversations, a click is no longer a reliable signal that someone's entering the funnel. It might be brand recall, or a quick check on something they'd already decided. So the surface-level metrics look fine, while their connection to the actual pipeline gets harder to demonstrate.

When roughly 70% of buyer activity happens before the first marketing or sales touch (2), last-click attribution isn't just imperfect, it's misleading. Campaigns influencing shortlisting decisions won't always show up in traditional metrics.

B2B paid performance should now be evaluated against account-level progression, pipeline quality and buying group engagement, not just lead volume. The sooner that conversation happens with clients and stakeholders, the better.

The compressed funnel is a brief to do better work

AI hasn't weakened paid media. It's raised the stakes. Brands that show up with authority and consistency at every stage of the pre-contact journey are the ones that end up on the shortlist.

The compressed buying funnel isn't a threat to paid channels. It's an invitation to be more strategic about how we use them.

Clarity Global is a strategic consultancy helping B2B technology companies build reputation, scale in new markets and drive demand. Get in touch to find out how we can support your paid media strategy.

Sources

[1] Forrester, Buyers' Journey Survey, 2025 — cited in "B2B Buyers Make Zero-Click Buying Number One," Forrester blog. https://www.forrester.com/blogs/b2b_buyers_make_zero_click_buying_number_one/

[2] 6sense, "Don't Call Us, We'll Call You: What Research Says About When B2B Buyers Reach Out to Sellers" (the "70% Constant" research), 2023. Corroborated by 6sense's 2024 B2B Buyer Experience Report (69%). https://6sense.com/blog/dont-call-us-well-call-you-what-research-says-about-when-b2b-buyers-reach-out-to-sellers/

[3] 6sense, The B2B Buyer Experience Report 2025. https://6sense.com/science-of-b2b/buyer-experience-report-2025/

[4] Forrester, The State of Business Buying, 2026 (press release, January 21, 2026). https://www.forrester.com/press-newsroom/forrester-2026-the-state-of-business-buying/

[5] 6sense, The B2B Buyer Experience Report 2025 (published November 12, 2025). https://6sense.com/science-of-b2b/buyer-experience-report-2025/

[6] Forrester, The State of Business Buying, 2024 (press release, December 4, 2024). https://www.forrester.com/press-newsroom/forrester-the-state-of-business-buying-2024/

[7] LinkedIn Marketing Solutions, Ad Targeting page. https://business.linkedin.com/advertise/ads/targeting

[8] LinkedIn Marketing Solutions, Audience page. https://business.linkedin.com/marketing-solutions/audience

[9] LinkedIn Marketing Solutions, Lead Generation resources. https://business.linkedin.com/advertise/resources/lead-generation

[10] Gartner, "Gartner Survey Finds 69% of B2B Buyers Turn to Sales Reps to Validate AI-Generated Insights," press release, May 20, 2026. https://www.gartner.com/en/newsroom/press-releases/2026-05-20-gartner-survey-finds-sixty-nine-percent-of-b-two-b-buyers-turn-to-sales-reps-to-validate-ai-generated-insights