AEO for RAG platforms: AI search visibility ranking
How AI search engines rank RAG platforms by visibility and citations. 20 brands measured quarterly across Google AI Mode: which brands the AI names in answers, which domains it cites as sources, and how the leaders compare. RAG platforms used to ingest data, retrieve relevant context, and power grounded question-answering and enterprise AI assistants. Composite score: 70% visibility (% of AI answers naming the brand) + 30% citation rate (% citing the brand's domain). Full methodology →
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When AI engines are asked about RAG platforms, Glean emerges as the top brand, mentioned in 37.5% of AI-generated responses. Other significant names include LangChain and LlamaIndex. Glean has a notable lead in visibility, establishing itself as a prime choice for buyers seeking reliable recommendations in this category.
The prominence of specific brands is influenced by the sources AI engines pull from. Key sites like google.com and onyx.app are frequently cited, along with input from reddit.com. These aggregator and review sites consolidate user opinions and expert analysis, shaping the AI's perspective on which brands stand out.
For buyers reviewing this list, understanding what AI engines prioritize is crucial. Recent reviews and third-party validations play a significant role, as does a brand's authority within specific subcategories. Buyers should consider how these factors reflect in the rankings to make an informed decision on which RAG platform best meets their needs.
At a glance
What we observed in this category
Glean leads the RAG platforms AEO landscape with a composite score of 30.0, the only brand in the top five to record any citation activity at 12.5%. LangChain and LlamaIndex match Glean on raw visibility at 37.5% each, but their composite scores fall to 26.2, a gap driven entirely by zero citation rates. With the category average visibility sitting at just 10.0%, all three top brands are performing well above the norm, yet the field drops sharply from rank three downward.
The visibility-to-citation divergence is the defining AEO pattern here. Glean is named frequently and also trusted enough to be cited, while LangChain and LlamaIndex achieve equal naming frequency but receive no citations at all. Vectara, Ragie, and Dify each hold 25.0% visibility with 0.0% citation, and brands from rank eight onward, including Cohere, Elastic, and Amazon Kendra, register zero on both measures. The category average citation rate of 0.6% confirms that direct citation is rare and therefore a meaningful differentiator.
Google AI Mode is the dominant engine for every brand in this audit, with no outliers on alternative engines. Among the top cited sources in the category, third-party and community properties appear prominently: onyx.app, reddit.com, firecrawl.dev, and consultancy or integrator domains such as tredence.com and dataiku.com sit alongside google.com itself. This suggests Google AI Mode is anchoring RAG platform answers on practitioner content and implementation-focused sources rather than on the platform vendors' own domains.
Movers & shakers since last refresh
Biggest visibility risers
-
Glean 0% → 38% · rank #4 → #1+38pp
-
LangChain 12% → 38% · rank #1 → #2+25pp
-
LlamaIndex 12% → 38% · rank #2 → #3+25pp
The AEO ranking
| # | Brand | Visibility | Citation | Top engine |
|---|---|---|---|---|
| 1 |
glean.com
|
38% | 12% | Google AI Mode |
Glean holds the top composite score of 30.0 and is the only brand among the top five to record any citations, at 12.5% against a category average of 0.6%. |
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| 2 |
langchain.com
|
38% | 0% | Google AI Mode |
LangChain matches Glean on visibility at 37.5% but scores 26.2 composite due to a 0.0% citation rate, making it frequently named but never directly cited. |
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| 3 |
llamaindex.ai
|
38% | 0% | Google AI Mode |
LlamaIndex mirrors LangChain exactly, with 37.5% visibility, a 26.2 composite score, and 0.0% citation, placing it in a statistical tie for second despite its third ranking. |
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| 4 |
vectara.com
|
25% | 0% | Google AI Mode |
Vectara sits at 25.0% visibility and a 17.5 composite score, 12.5 points below the top tier and with no citation activity recorded in this audit period. |
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| 5 |
ragie.ai
|
25% | 0% | Google AI Mode |
Ragie shares Vectara's exact scores of 25.0% visibility and 17.5 composite, performing 2.5 times above the category average visibility while generating zero citations. |
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| 6 |
dify.ai
|
25% | 0% | Google AI Mode |
| 7 |
deepset.ai
|
12% | 0% | Google AI Mode |
| 8 |
cohere.com
|
0% | 0% | Google AI Mode |
| 9 |
elastic.co
|
0% | 0% | Google AI Mode |
| 10 |
aws.amazon.com
|
0% | 0% | Google AI Mode |
| 11 |
databricks.com
|
0% | 0% | Google AI Mode |
| 12 |
weaviate.io
|
0% | 0% | Google AI Mode |
| 13 |
cloud.google.com
|
0% | 0% | Google AI Mode |
| 14 |
pinecone.io
|
0% | 0% | Google AI Mode |
| 15 |
qdrant.tech
|
0% | 0% | Google AI Mode |
| 16 |
pathway.com
|
0% | 0% | Google AI Mode |
| 17 |
flowiseai.com
|
0% | 0% | Google AI Mode |
| 18 |
unstructured.io
|
0% | 0% | Google AI Mode |
| 19 |
azure.microsoft.com
|
0% | 0% | Google AI Mode |
| 20 |
mongodb.com
|
0% | 0% | Google AI Mode |
Sources AI engines trust in this category
Across the 8 buyer-intent queries we ran on RAG platforms, these are the domains Google AI Mode cited most often. If you're not on this list — or if your competitors are — that's a concrete PR / linkbuilding target.
How to read this AEO ranking
Four things worth knowing before you act on the numbers above. These are the same definitions across every industry page — for category-specific observations, see the What we observed section above (where available) and the per-brand insights inline in the ranking.
Visibility = being named
A brand's visibility % is the share of AI answers that mention it by name in the response prose. This is who AI engines actively recommend to the buyer. More on visibility →
Citation rate = being trusted
Citation rate is the share of AI answers that include the brand's domain as a clickable source link. This is what the AI treats as authoritative evidence, different from being named. More on citation rate →
Top engine differs by brand
The "top engine" column shows which AI surface each brand performs best on. Big gaps between a brand's score across engines usually points to specific content or schema gaps. How AI engines pick sources →
AEO rankings move month to month
AI engines re-crawl and re-rank on shorter cycles than classical search. We re-audit every brand on this list at least every 90 days and refresh this page automatically. How AI search ranking works →
Run an AEO audit on your own RAG platforms brand
The brands above were curated from public market-leader lists. Want the same answer engine optimisation measurement against your own brand — including the queries you appear on, which competitors get named instead, and a prioritised fix list? Run a free preview.
Frequently asked about AEO for RAG platforms
Who leads AEO in RAG platforms right now?
Glean leads with a composite score of 30.0 and is the only top-five brand to achieve any citation activity, recording a 12.5% citation rate against a category average of 0.6%.
What sources does Google AI Mode cite most for RAG platforms research?
The top cited sources include google.com, onyx.app, reddit.com, firecrawl.dev, and implementation-focused domains such as tredence.com and dataiku.com, suggesting AI answers anchor on practitioner and third-party content rather than vendor sites.
How big is the gap between being named and being cited in this category?
Four of the top five brands reach 25.0% to 37.5% visibility but hold a 0.0% citation rate, while the category average citation rate is just 0.6%, making citation a rare and meaningful differentiator for AEO performance.
Which RAG platform brands have zero AI visibility?
Cohere, Elastic, and Amazon Kendra each record 0.0% visibility and 0.0% citation in this audit, despite being established platforms in the broader AI infrastructure space.
How quickly can visibility shift in the RAG platforms AEO category?
Glean rose from 0.0% to 37.5% visibility in a single audit cycle, moving from rank four to rank one, indicating that Google AI Mode can shift brand prominence rapidly in this category.
Is AEO performance in RAG platforms concentrated among a few brands?
Yes, the top three brands each sit at 37.5% visibility against a category average of 10.0%, while 8 of the 20 tracked brands in the broader set hold a 0.0% composite score, showing significant concentration at the top.