Live data · Updated Mar 22, 2026

The AI Search Index

How AI search engines discover, crawl, and recommend the web. Aggregated from 3,358+ properties across 8 models - updated daily.

Properties
3,358+
Models Tracked
8
Crawler Visits
576K+
[01]Who's sending the traffic?

ChatGPT drives 80% of all AI referral traffic — more than every other model combined.

7-Day Change
8.0%
30-Day Change
1.8%
Properties
3,358
Market Share (30d)
ChatGPT
80%
Gemini
10%
Claude
4%
Perplexity
3%
Grok
0%
DeepSeek
0%

AI Referral Traffic by Source

Rescaled so the highest visible point = 100%

GPT-5
Opus 4.5
Christmas
Opus 4.6
GPT-5.4
Jun 1Jun 27Jul 23Aug 18Sep 14Oct 10Nov 5Dec 1Dec 27Jan 23Feb 19Mar 220%25%50%75%100%

Aggregated from 3,358+ anonymized GA4 properties. Market share = % of total AI sessions (30d). Updated daily.

Explore full AI traffic index
[02]Who gets recommended?
[03]What content wins?

Review / Directory pages are 4.8x efficient - cited far more than crawled. Homepage pages are just 0.74x - heavily crawled but rarely recommended.

Page Type
Crawl ShareCitation Share
Efficiency
Review / Directory
0.3%
1.2%
4.77x
About / Contact
0.4%
1.7%
4.59x
Resource / Report
0.4%
1.4%
3.76x
Service / Use Case
1.4%
2.6%
1.87x
Blog / Editorial
14.4%
20.2%
1.40x
Documentation
0.7%
0.8%
1.13x
Integration
0.4%
0.4%
0.96x
Homepage
10.7%
7.9%
0.74x
View full page type performance study
[04]Do AI models agree?

AI models only agree 43% of the time on average. Claude and Deepseek agree most (35%), while Meta and Perplexity diverge the most (10%).

Average Agreement
43.3%
Perfect Agreement
4.0%
High Divergence
14.6%
Avg Top-3 Overlap
2.8
Model Correlation Matrix
Hover to compare
OpenClauGemiAIOGrokDeepMetaPerp
OpenAI
-
27
21
20
24
25
17
17
Claude
27
-
26
19
35
35
23
15
Gemini
21
26
-
17
24
26
16
12
AIO
20
19
17
-
17
18
12
17
Grok
24
35
24
17
-
31
21
14
Deepseek
25
35
26
18
31
-
22
15
Meta
17
23
16
12
21
22
-
10
Perplexity
17
15
12
17
14
15
10
-
Agreement by Query Type
Comparison
50.4%
How To
45.3%
Alternative
44.1%
Best Of
43.4%
Recommendation
43.1%
View full model divergence study
[05]How do they find you?

ChatGPT crawlers account for 72% of all visits — more than all other crawlers combined. 88.5% of pages are visited exactly once and never revisited.

Market Share by Crawler
ChatGPT Training
57.2%
ChatGPT Search
15.1%
ByteSpider
9.2%
Meta
7.9%
Amazon
6.7%
Claude Training
3.8%
Single-Visit Pages
88.5%
of pages visited exactly once
Weekend Reduction
-21%
average weekend crawl reduction
Unique URLs
315K
unique URLs crawled
View full crawler behavior study
[06]What happens to your search?

1 in 3 prompts is rewritten before reaching search results. Only 0.17% pass through unchanged. Year injection is the most common pattern - AI models assume you want current information even when you don't specify it.

Rewrite Rate
33%
of prompts are rewritten
Year Injection
25.7%
add current year to queries
Exact Match
0.17%
pass through unchanged
Year InjectionAdds current year even when you don't ask
IN
best project management tools
OUT
best project management tools 2026
Brand HallucinationInjects brand names into generic queries
IN
best running shoes for flat feet
OUT
best running shoes for flat feet Nike Brooks ASICS
Intent EscalationExpands simple lookups into comparisons
IN
CRM software
OUT
best CRM software for small business comparison review
Audience FabricationInvents demographic and budget constraints
IN
best laptops for students
OUT
best laptops for college students budget under $1000 2026
View full query translation study
[07]Does llms.txt actually help?

Only 13.3% of AI-cited domains have llms.txt, and there's no statistical evidence it improves citation rates (p = 0.85). The verdict: inconclusive.

Adoption Rate
13.3%

of AI-cited domains have adopted llms.txt. While adoption is growing, the file's effect on citation rates remains statistically indistinguishable from noise.

Statistical Test
p = 0.85
Mann-Whitney U - not significant
Domains Scanned
37,894
checked for llms.txt presence
Verdict
Inconclusive
Correlation, not causation - the question remains open.
View full llms.txt effect study

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