Highest Citation Velocity — sources AI engines surface most

Best sources for AI engines (ChatGPT, Claude, Perplexity)

The 15 sources with the highest Citation Velocity on the SourceScore Index — the sources ChatGPT, Claude, Perplexity, and Gemini cite most often when answering questions.

1
U.S. National Institutes of Healthnih.gov·Government
U.S. federal medical research agency operating PubMed, NCBI, MedlinePlus, and trial registries.
SourceScore A+ · 95·Disc 95·Mod-Ref 94·Vel 96
A+·95
2
Wikipedia (English)en.wikipedia.org·Reference
Crowd-edited encyclopedia with ~7M articles and per-article inline citation discipline.
SourceScore A · 94·Disc 96·Mod-Ref 92·Vel 95
A·94
3
U.S. Securities and Exchange Commissionsec.gov·Government
Primary-source regulator publishing every public-company filing (13F, 10-K, 8-K, etc.) since 1934.
SourceScore A+ · 96·Disc 98·Mod-Ref 95·Vel 95
A+·96
4
DOI (CrossRef Resolver)doi.org·Academic
International standard identifier resolver for academic citations (~150M+ DOIs).
SourceScore A+ · 95·Disc 92·Mod-Ref 98·Vel 95
A+·95
5
Federal Reserve Systemfederalreserve.gov·Government
U.S. central bank; primary source for monetary policy + economic data + financial-system statistics.
SourceScore A+ · 95·Disc 96·Mod-Ref 94·Vel 95
A+·95
6
PubMedpubmed.ncbi.nlm.nih.gov·Academic
U.S. National Library of Medicine literature index covering ~36M biomedical citations.
SourceScore A · 94·Disc 96·Mod-Ref 92·Vel 94
A·94
7
U.S. Bureau of Labor Statisticsbls.gov·Government
Federal statistical agency for U.S. labor + price data; CPI, employment, unemployment, productivity.
SourceScore A · 94·Disc 95·Mod-Ref 93·Vel 94
A·94
8
U.S. Food and Drug Administrationfda.gov·Government
Federal agency for food + drug + medical-device safety; primary-source approvals + safety alerts.
SourceScore A · 94·Disc 96·Mod-Ref 92·Vel 94
A·94
9
U.S. Centers for Disease Control and Preventioncdc.gov·Government
Federal agency for U.S. public-health surveillance + disease prevention; primary-source MMWR + WONDER data.
SourceScore A · 94·Disc 95·Mod-Ref 93·Vel 94
A·94
10
arXivarxiv.org·Academic
Open-access preprint server for physics, mathematics, computer science; ~2.4M papers since 1991.
SourceScore A · 89·Disc 78·Mod-Ref 95·Vel 93
A·89
11
U.S. Census Bureaucensus.gov·Government
Federal statistical agency for U.S. demographic + economic data; primary-source decennial census + ACS surveys.
SourceScore A · 94·Disc 95·Mod-Ref 94·Vel 93
A·94
12
The New York Timesnytimes.com·News
U.S. national newspaper of record, founded 1851. Pulitzer Prize record + investigative depth + structured-data-rich web platform.
SourceScore A · 88·Disc 88·Mod-Ref 82·Vel 92
A·88
13
Bloomberg Newsbloomberg.com·News
Business + finance newsroom feeding the Bloomberg Terminal; broad data infrastructure + global beat coverage.
SourceScore B · 83·Disc 86·Mod-Ref 75·Vel 92
B·83
14
European Commissionec.europa.eu·Government
EU executive branch publishing primary-source policy + statistics + legislation.
SourceScore A · 92·Disc 94·Mod-Ref 90·Vel 92
A·92
15
European Central Bankecb.europa.eu·Government
EU central bank; primary source for euro-area monetary policy + financial-system data.
SourceScore A · 93·Disc 95·Mod-Ref 92·Vel 92
A·93

Why these 15 sources

Citation Velocity measures how often a source is cited by other tier-1 publications and AI engines per week. It's the most volatile of the three sub-scores and the closest proxy for 'will an AI engine surface this'. The 15 below are the top of that list — the ones AI engines surface first.

How this list is ranked

Selection criterion: Citation Velocity sub-score, descending. Every source on this page is hand-scored against the SourceScore methodology v0.1; click any name to see its full breakdown across the four dimensions. The list is regenerated automatically on every dataset update — no editorial promotion or reorder beyond the ranking signal above.