Gartner's latest analysis of business-to-business purchasing concludes that AI now steers large parts of the buying process, yet human sellers remain decisive where deals actually close — at the confidence stage.

The report, surfaced via Demand Gen Report, frames a split purchasing reality. Buyers lean on AI and digital self-service to research, compare, and shortlist vendors on their own. But when it comes to building enough trust to sign a contract, they still turn to people.

What does the research actually say?

Gartner's central claim is that AI is reshaping B2B buying behavior — not replacing the seller. The useful distinction for revenue teams is between information gathering and decision confirmation:

• AI-driven stages: buyers use AI tools, peer networks, and third-party content to narrow options before a seller is involved.
• Human-driven stages: confidence, trust, and final commitment still depend on direct interaction with salespeople.

That framing carries a hard implication for territory and pipeline design. If discovery and education happen increasingly off the seller's radar, the first live conversation may arrive later in the cycle than CRM timestamps suggest.

Gartner has built this line of research on surveys of B2B buyers over multiple years, tracking how purchase tasks distribute across digital, AI-assisted, and human channels. Demand Gen Report's summary did not publish the underlying sample sizes or survey dates alongside the headline findings, so teams citing the numbers should pull the original Gartner material before quoting specifics.

Which stages and team sizes does this affect?

The finding lands hardest on teams whose motion depends on early-funnel influence:

• Enterprise and mid-market sellers who historically won deals by controlling information flow face buyers who arrive pre-researched and AI-briefed.
• Small teams with limited content output gain an odd advantage: if buyers self-educate anyway, scarce seller hours shift toward late-stage trust-building rather than prospect education.
• Demand gen leaders lose attribution visibility, since AI-mediated research happens outside tracked channels.

The practical consequence Gartner points toward: sellers who show up as information deliverers add less value than before. Sellers who close the confidence gap — addressing risk, stakeholder alignment, and internal buy-in — keep it.

Measured versus asserted

Two things should not be conflated here. Gartner's measured observation is that buying behavior has shifted toward AI-assisted research. The interpretive layer — that human sellers "close the confidence gap" — is an analytical conclusion about where value now concentrates, and it matches the firm's broader thesis that buying jobs, not touches, define the journey.

Demand Gen Report presents both without disputing either, and no vendor product claims appear in the coverage. That makes this a cleaner data point than most vendor-funded research in the same space.

What comes next

Expect Gartner to keep pressure on this theme: prior work from the firm predicted a majority of B2B sales interactions would be AI-augmented within the decade, and this report extends that trajectory into the buy side. For sales leaders, the open question is operational — how to detect and measure a buying process that increasingly runs through tools your stack cannot see.