AI Recommendation Stability
What marketers need to know about how AI decides which brands to recommend
Noriko Yokoi, Ph.D., Thorsten Linz, and the 3cubed.ai Research Team
Across 26 unaided buyer questions, four AI engines, and three controlled conditions.
With live web retrieval on, repeat questions often produced a different top brand.
Only 7 of 26 questions produced the same top brand across all four engines.
The typical brand appeared in just 1 in 10 responses for its own category question.
The top 10 cited domains accounted for 28.6% of 3,059 source citations.
Why this study matters
Buyers increasingly ask AI assistants for recommendations instead of comparing a page of search results. This changes the visibility problem for brands. A single AI answer can name a short list of vendors, source domains, or service providers, and the buyer may never inspect the wider market.
The question behind this study was simple: once a brand earns an AI citation, does it stay cited? The answer was no. AI recommendation is not a fixed position. It behaves like a shifting probability that changes by prompt, engine, retrieval source, and time.
How the study was run
The study was pre-registered before data collection. Research questions, hypotheses, the query set, segment assignments, engine choices, experimental conditions, extraction rules, and primary metrics were locked in advance.
| Engine | Model version | Query coverage |
|---|---|---|
| ChatGPT | GPT-5.5 | 26 queries |
| Gemini | Gemini 3.5 Flash | 26 queries |
| Claude | Claude Sonnet 4.6 | 14 queries |
| Perplexity | Perplexity Sonar | 26 queries |
| Condition | What it means | What it isolates |
|---|---|---|
| Floor | Minimum randomness, no live web search | Model-level instability |
| Sampled | Normal randomness, no live web search | Generation variation |
| Web | Normal randomness, live web retrieval on | Real-world retrieval variation |
Finding 1: AI recommendations are not stable
Even with randomness minimized and live web search off, identical questions returned the same top brand only 78% to 87% of the time, depending on the engine. With live web retrieval on, consistency dropped to 48% to 68%.
| Engine | RCS floor | RCS sampled | RCS web |
|---|---|---|---|
| ChatGPT | 0.78 | 0.78 | 0.48 |
| Gemini | 0.78 | 0.67 | 0.54 |
| Claude | 0.87 | 0.69 | 0.50 |
| Perplexity | N/A | N/A | 0.68 |
Finding 2: Engines often disagree
Across 26 buyer questions tested on all four engines, only 7 questions, or 27%, produced unanimous agreement on the top brand. A brand can lead on one engine and be absent on another, which makes single-engine tracking incomplete.
Finding 3: Most brands appear rarely
Only 2.4% of brand-question combinations reached a 100% appearance rate. 85.7% fell below 50%, and the median appearance rate was 10%. In practice, a brand that "appears in AI" may show up in 1 of 10 responses, not 9 of 10.
Finding 4: Gatekeeper publications shape the answer
The study found 376 unique cited domains across all engines and questions. The top 10 domains accounted for 28.6% of all 3,059 source citations. Chambers, Forbes, and TechRadar alone accounted for 15.8%.
| Publication | Times cited | Citation share | Who it matters for |
|---|---|---|---|
| Chambers | 250 | 8.2% | Legal services |
| Forbes | 122 | 4.0% | Finance, business, consumer |
| TechRadar | 110 | 3.6% | B2B software, consumer tech |
| U.S. News Best Law Firms | 70 | 2.3% | Legal services |
| Tom's Guide | 67 | 2.2% | Consumer tech, software |
| RTINGS.com | 67 | 2.2% | Consumer electronics |
| NerdWallet | 51 | 1.7% | Personal finance |
| Legal 500 | 49 | 1.6% | Legal services |
| Vault | 47 | 1.5% | Legal, career |
| Sleep Foundation | 43 | 1.4% | Consumer health, mattresses |
What marketers should do next
- Measure appearance rate, not a yes-or-no snapshot.
- Track across all three engines: ChatGPT, Perplexity, and Gemini.
- Run repeated checks because one-off scans miss instability.
- Identify the source domains AI engines cite most in your category.
- Build coverage in those gatekeeper publications, then monitor drift.
Run this measurement for your brand
Findabl tracks your buyer questions across ChatGPT, Perplexity, and Gemini, maps the source domains shaping the answer, and turns missed citations into actions.
Check my AI citationsRead the full white paper
The PDF includes the full methodology, limitations, appendix query list, and references.
Download PDFFollow-up: Google results vs AI answers (July 2026)
In July we checked Google's top five results for the same 26 questions and compared them with the sources the AI engines cited in June.
Why this snapshot
In June we measured how AI engines recommend brands. This snapshot asks the follow-up question: when a buyer types the same question into Google, which pages do they see first, and are those the same sources AI engines draw on?
How it was collected
Google organic search, US English, desktop, collected July 13, 2026. Los Angeles and New York City location settings for the two local legal questions, United States for the rest. The first five organic results for each of the 26 questions that produced usable AI results in the June study: 15 regulated, 6 consumer and 5 B2B. The set is not balanced by segment. No new AI calls were made; the comparison uses the sources AI engines cited in June.
Finding 1: Google usually shows a gatekeeper before the provider
Only 5 of 26 first organic results were the provider's own page: Salesforce, ProProfs, Fidelity, Walgreens and Wildes Law. The other 21 were publishers, rankings, communities, reference sites or government sources. For recommendation questions, being found is mostly about being included in the pages Google already trusts.
Finding 2: An AI layer already sits above the organic results
Google showed an AI Overview for 24 of 26 questions. In each of those, the first organic result was the second thing on the page. For this kind of question, search results and AI answers are no longer separate channels.
Finding 3: Google and AI answers share much of the same source layer
68 of the 130 Google results came from domains that AI engines also cited somewhere in the June study, across 24 of the 26 questions. The first organic domain was among them for 19 of 26. This is shared sources, matched across the whole June dataset rather than question by question. It does not show that a Google ranking causes an AI recommendation. Recurring names include Vault, Best Law Firms, Forbes, NerdWallet, Healthline, Newsweek, Fidelity, the SBA, Bon Appetit and Runner's World.
Finding 4: Reddit is a major discovery surface
Reddit appeared in the top five for 14 of 26 questions: all 5 B2B questions, 5 of 6 consumer questions and 4 of 15 regulated ones. It ranked first for the VPN question. Peer discussion is part of how buyers compare options in B2B and consumer categories.
Finding 5: Many sources, a few recurring gatekeepers
The 130 results came from 103 different domains. A handful recurred: Reddit (14 appearances), Forbes (4), Vault, Wikipedia and YouTube (3 each), and Amazon, GoodRx, PCMag, the Wall Street Journal and LinkedIn (2 each). The work is twofold: earn a presence on the recurring platforms, then find the specialist gatekeeper for your own category.
What marketers should do next
- Find the pages that rank for your buyer questions, and check which brands those pages mention.
- Prioritize sources that show up in both Google and AI answers.
- Separate work on your own site from earned coverage; most first results were not provider pages.
- Treat Reddit as a real channel in B2B and consumer categories.
- Track AI Overviews alongside organic position.
Question-level results
| Segment | Question | First organic domain | Other domains in the top five |
|---|---|---|---|
| B2B | Best CRM platforms for small businesses | salesforce.com | reddit.com, zoho.com, pcmag.com, youtube.com |
| B2B | Best email marketing platforms | emailvendorselection.com | mailtrap.io, reddit.com, emailtooltester.com, ventureharbour.com |
| B2B | Best customer support help desk tools | proprofsdesk.com | thedigitalprojectmanager.com, reddit.com, zapier.com, timetoreply.com |
| B2B | Best project management tools | icagile.com | project-management.com, reddit.com, paymoapp.com, microsoft.com |
| B2B | Best web hosting providers | hostingstep.com | techradar.com, reddit.com, namecheap.com, youtube.com |
| Consumer | Best mattresses to buy | naplab.com | mattressnerd.com, reddit.com, sleepfoundation.org, ncoa.org |
| Consumer | Best meal kit delivery services | bonappetit.com | wired.com, reddit.com, seriouseats.com, homechef.com |
| Consumer | Best protein powder brands | forbes.com | reddit.com, amazon.com, jacquibryan.com, goodrx.com |
| Consumer | Best robot vacuums | thesmarthomehookup.com | nytimes.com, amazon.com, rtings.com, consumeranalysis.com |
| Consumer | Best running shoes for beginners | runnersworld.com | reddit.com, runrepeat.com, theruntesters.com, youtube.com |
| Consumer | Best VPN services | reddit.com | pcmag.com, myvegantravels.com, thebestvpn.com, cnet.com |
| Regulated | Best 401(k) providers for small businesses | fidelity.com | reddit.com, merrilledge.com, myubiquity.com, adp.com |
| Regulated | Largest banks in the United States | wikipedia.org | federalreserve.gov, usnews.com, personetics.com, spglobal.com |
| Regulated | Best independent RIAs for high-net-worth clients | wsj.com | barrons.com, forbes.com, findyourindependentadvisor.com, cressetcapital.com |
| Regulated | Best robo-advisors for retirement investing | nerdwallet.com | wsj.com, vanguard.com, schwab.com, reddit.com |
| Regulated | Best lenders for small business loans | sba.gov | bankofamerica.com, forbes.com, credibly.com, bankrate.com |
| Regulated | Best telehealth platforms for ADHD treatment | healthline.com | forbes.com, talkiatry.com, growtherapy.com, cigna.com |
| Regulated | Best EHR systems for small medical practices | ehrinpractice.com | hipaajournal.com, omnimd.com, rxnt.com, practicesuite.com |
| Regulated | Top-ranked hospitals in the United States | newsweek.com | usnews.com, statista.com, barnesjewish.org, lownhospitalsindex.org |
| Regulated | Best online providers for prescription weight-loss medication | walgreens.com | goodrx.com, obesitymedicine.org, forhers.com, weightwatchers.com |
| Regulated | Most prestigious large US law firms | vault.com | wikipedia.org, linkedin.com, bcgsearch.com, reddit.com |
| Regulated | Top immigration attorneys in New York City | wildeslaw.com | superlawyers.com, justia.com, shautsova.com, pozogoldsteinny.com |
| Regulated | Leading US intellectual property law firms | vault.com | chambers.com, alston.com, ip-coster.com, paulhastings.com |
| Regulated | Best personal injury law firms in Los Angeles | bestlawfirms.com | reddit.com, lanierlawfirm.com, panish.law, yelp.com |
| Regulated | Leading US white-collar criminal defense firms | vault.com | duanemorris.com, lw.com, bestlawyers.com, wilmerhale.com |
| Regulated | Best biologics CDMOs | genengnews.com | nih.gov, agcbio.com, wikipedia.org, linkedin.com |
Limits
A point-in-time snapshot, not a stability study. Google results change with location, device, personalization, index updates and news. The source overlap shows shared domains, matched across the whole June AI dataset; it does not prove that a ranking caused an AI recommendation. Only the top five organic results were kept. The segments are not balanced.