Claude · Machine Relations Index

Which sources does Claude cite most?

Name: Which sources does Claude cite most?
Creator: Jaxon Parrott
License: https://creativecommons.org/licenses/by/4.0/
Keywords: Claude, Machine Relations Index

As of October 25, 2026, Arxiv.org is the most-cited source in Claude answers, cited in 3.74% of 7,188 observed Claude runs.

A rate is the share of Claude's observed runs, across every category in the window, that cited the source. Engines answer different numbers of runs, so compare rates, not counts.

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Ranking

Sources ranked by citation rate

Rank	Source	Source role	Citation rate	Cited runs	Engine's observed runs	Confidence
#1 of 8,718	Arxiv.org	Academic and government source	3.74%	269	7,188	A
#2 of 8,718	Medium	Community and social platform	2.84%	204	7,188	A
#3 of 8,718	Forbes	Editorial publication	1.91%	137	7,188	A
#4 of 8,718	Yahoo News	Editorial publication	1.79%	129	7,188	A
#5 of 8,718	Guideflow.com	Other observed source	1.75%	126	7,188	A
#6 of 8,718	G2	Market and company database	1.31%	94	7,188	A
#7 of 8,718	Impulsec.com	Other observed source	1.17%	84	7,188	B
#8 of 8,718	NIH	Academic and government source	1.14%	82	7,188	A
#9 of 8,718	NerdWallet	Editorial publication	1.13%	81	7,188	A
#10 of 8,718	Crunchbase.com	Market and company database	1.11%	80	7,188	B
#10 of 8,718	Gartner.com	Analyst and consulting research	1.11%	80	7,188	A
#12 of 8,718	Dev.to	Community and social platform	1.02%	73	7,188	A
#13 of 8,718	Rippling.com	Vendor-owned source	0.93%	67	7,188	B
#14 of 8,718	Tech Insider	Editorial publication	0.86%	62	7,188	B
#15 of 8,718	Substack.com	Community and social platform	0.85%	61	7,188	A
#15 of 8,718	Wikipedia	Academic and government source	0.85%	61	7,188	A
#17 of 8,718	Hubspot.com	Vendor-owned source	0.83%	60	7,188	A
#18 of 8,718	CNBC	Editorial publication	0.82%	59	7,188	B
#19 of 8,718	Erpresearch.com	Market and company database	0.81%	58	7,188	B
#19 of 8,718	Spheron.network	Other observed source	0.81%	58	7,188	B
#19 of 8,718	Track360.io	Other observed source	0.81%	58	7,188	B
#22 of 8,718	Expert Insights	Editorial publication	0.77%	55	7,188	B
#22 of 8,718	Uspto.gov	Academic and government source	0.77%	55	7,188	C
#24 of 8,718	Allaboutcookies.org	Other observed source	0.75%	54	7,188	B
#25 of 8,718	Omnimd.com	Other observed source	0.74%	53	7,188	B
#25 of 8,718	Useboomerang.com	Other observed source	0.74%	53	7,188	B
#27 of 8,718	Healthline	Editorial publication	0.72%	52	7,188	B
#27 of 8,718	Improvado.io	Vendor-owned source	0.72%	52	7,188	B
#27 of 8,718	People Managing People	Editorial publication	0.72%	52	7,188	B
#30 of 8,718	Airwallex.com	Vendor-owned source	0.71%	51	7,188	B
#31 of 8,718	Researchgate.net	Academic and government source	0.70%	50	7,188	B
#31 of 8,718	Stackmatix.com	Other observed source	0.70%	50	7,188	B
#33 of 8,718	Decryption Digest	Other observed source	0.65%	47	7,188	C
#34 of 8,718	Monday.com	Vendor-owned source	0.63%	45	7,188	B
#34 of 8,718	TechRadar	Editorial publication	0.63%	45	7,188	A
#36 of 8,718	Landbase.com	Vendor-owned source	0.61%	44	7,188	A
#36 of 8,718	TechCrunch	Editorial publication	0.61%	44	7,188	B
#38 of 8,718	Cdp.com	Vendor-owned source	0.60%	43	7,188	B
#39 of 8,718	Gmicloud.ai	Other observed source	0.58%	42	7,188	B
#39 of 8,718	Technologyadvice.com	Market and company database	0.58%	42	7,188	B
#41 of 8,718	Digitalapplied.com	Vendor-owned source	0.57%	41	7,188	B
#41 of 8,718	Sciencedirect.com	Academic and government source	0.57%	41	7,188	B
#41 of 8,718	Therankmasters.com	Vendor-owned source	0.57%	41	7,188	B
#44 of 8,718	Coggno.com	Other observed source	0.56%	40	7,188	C
#44 of 8,718	Microsoft.com	Vendor-owned source	0.56%	40	7,188	A
#44 of 8,718	Softwarefinder.com	Market and company database	0.56%	40	7,188	B
#44 of 8,718	TechTarget	Editorial publication	0.56%	40	7,188	A
#48 of 8,718	Alibaba.com	Other observed source	0.54%	39	7,188	B
#48 of 8,718	Huntress.com	Vendor-owned source	0.54%	39	7,188	B
#48 of 8,718	Paloaltonetworks.com	Vendor-owned source	0.54%	39	7,188	A
#48 of 8,718	Sentinelone.com	Vendor-owned source	0.54%	39	7,188	B
#52 of 8,718	Pin.com	Vendor-owned source	0.53%	38	7,188	B
#52 of 8,718	Security.org	Other observed source	0.53%	38	7,188	B
#52 of 8,718	Tracxn.com	Market and company database	0.53%	38	7,188	B
#55 of 8,718	Getmaxim.ai	Other observed source	0.51%	37	7,188	B
#55 of 8,718	Safewise.com	Other observed source	0.51%	37	7,188	B
#57 of 8,718	Amazon.com	Other observed source	0.50%	36	7,188	A
#57 of 8,718	Anysilicon.com	Other observed source	0.50%	36	7,188	B
#57 of 8,718	Cyber Security News	Editorial publication	0.50%	36	7,188	C
#57 of 8,718	Databricks.com	Vendor-owned source	0.50%	36	7,188	B
#57 of 8,718	Deloitte.com	Analyst and consulting research	0.50%	36	7,188	B
#57 of 8,718	Tom's Guide	Editorial publication	0.50%	36	7,188	B
#63 of 8,718	Harvard.edu	Academic and government source	0.49%	35	7,188	B
#63 of 8,718	LinkedIn	Community and social platform	0.49%	35	7,188	A
#63 of 8,718	Mordorintelligence.com	Market and company database	0.49%	35	7,188	B
#63 of 8,718	Ovaledge.com	Other observed source	0.49%	35	7,188	B
#63 of 8,718	Patsnap.com	Other observed source	0.49%	35	7,188	B
#63 of 8,718	Qubit.capital	Market and company database	0.49%	35	7,188	B
#69 of 8,718	Medicalbillersandcoders.com	Vendor-owned source	0.47%	34	7,188	B
#69 of 8,718	Vectra.ai	Vendor-owned source	0.47%	34	7,188	B
#71 of 8,718	Atlan.com	Vendor-owned source	0.46%	33	7,188	B
#71 of 8,718	Canopy.us	Other observed source	0.46%	33	7,188	C
#71 of 8,718	Growthlist.co	Market and company database	0.46%	33	7,188	C
#74 of 8,718	Averi.ai	Other observed source	0.43%	31	7,188	C
#74 of 8,718	Failory.com	Market and company database	0.43%	31	7,188	B
#74 of 8,718	Safetydetectives.com	Other observed source	0.43%	31	7,188	B
#74 of 8,718	Unbiased.com	Vendor-owned source	0.43%	31	7,188	C
#74 of 8,718	U.S. News & World Report	Editorial publication	0.43%	31	7,188	B
#79 of 8,718	The Motley Fool	Editorial publication	0.42%	30	7,188	C
#79 of 8,718	Jelliesapp.com	Other observed source	0.42%	30	7,188	C
#79 of 8,718	PYMNTS	Editorial publication	0.42%	30	7,188	C
#79 of 8,718	Siit.io	Other observed source	0.42%	30	7,188	C
#83 of 8,718	Fierce Healthcare	Editorial publication	0.40%	29	7,188	B
#83 of 8,718	Fortunebusinessinsights.com	Market and company database	0.40%	29	7,188	B
#83 of 8,718	Shadow.inc	Other observed source	0.40%	29	7,188	B
#86 of 8,718	Github.com	Community and social platform	0.39%	28	7,188	A
#86 of 8,718	Lmspedia.org	Other observed source	0.39%	28	7,188	C
#86 of 8,718	Truefoundry.com	Vendor-owned source	0.39%	28	7,188	B
#86 of 8,718	Wifitalents.com	Analyst and consulting research	0.39%	28	7,188	B
#86 of 8,718	Wiz.io	Vendor-owned source	0.39%	28	7,188	B
#91 of 8,718	Gammastack.com	Other observed source	0.38%	27	7,188	B
#91 of 8,718	Getfreed.ai	Other observed source	0.38%	27	7,188	C
#91 of 8,718	Kodedice.com	Other observed source	0.38%	27	7,188	C
#91 of 8,718	Nicklafferty.com	Other observed source	0.38%	27	7,188	C
#91 of 8,718	Outsail.co	Analyst and consulting research	0.38%	27	7,188	C
#96 of 8,718	Angi.com	Other observed source	0.36%	26	7,188	B
#96 of 8,718	Certifyhealth.com	Vendor-owned source	0.36%	26	7,188	C
#96 of 8,718	Ibm.com	Vendor-owned source	0.36%	26	7,188	A
#96 of 8,718	Ustechautomations.com	Other observed source	0.36%	26	7,188	C
#96 of 8,718	Y Combinator	Community and social platform	0.36%	26	7,188	B

Showing the first 100 of 8,718 ranked sources.

Whole-window rates among published segments

Each link ranks sources with a published segment in that category by this engine's citation rate across the whole window. A collecting category has no published segment, so it publishes no ranking.

Method

What each engine's figures measure

Release mri_score_v2.1+2026-10-25+9c34b2dccc04; methodology mri_score_v2.1; generated 2026-10-25; window 2026-05-10 to 2026-10-25; artifact 9f1a507f84e8.

The release roster names the model claude-haiku-4-5-20251001 for Claude.

Claude's sample is 7,188 observed runs across 161 dates. The evidence floor is 10 observed runs and 7 distinct dates.

ChatGPT runs. They go through OpenAI's API with web search switched on, using the model each release names in its engine roster: gpt-4.1-mini-2025-04-14 in current releases, while earlier runs in the window were answered by gpt-4o-mini-search-preview-2025-03-11. That is the retrieval layer apps and research agents built on OpenAI's API use. The signed-in ChatGPT app answers with its own models and search pipeline and cites differently: a preprint submitted on 2026-10-11 and not yet peer reviewed found that Google Search and OpenAI's API on comparable models together recovered about half of the hostnames ChatGPT Web cited (48.7 and 50.3 percent on two model settings) and 26 to 28 percent of its exact URLs (arXiv 2610.15382v1). Claude, Gemini and Perplexity runs are likewise API runs with web search, on the models the roster names.

Method note, 2026-09-25. From that date, Google AI Mode and Google AI Overviews runs come through a different collection path than earlier runs, with no overlapping days, and answers collected on the two paths differ in how many distinct domains each cites. Per-answer figures for those two engines are read within one side of 2026-09-25, not as a trend across it.

Degraded coverage: 5 of 6 answer engines are currently returning citation-bearing answers. gemini quiet (5 of 20 collected calls produced an observation, 25%). Coverage across the window is uneven: gemini returned citation-bearing answers on 140 of 162 observed days (2,197 of 6,962 returned runs produced a citation); google_ai_mode returned citation-bearing answers on 119 of 162 observed days (1,613 of 2,086 returned runs produced a citation); google_ai_overviews returned citation-bearing answers on 102 of 162 observed days (963 of 1,446 returned runs produced a citation). Engines below 90% of the window are named here; per-engine day and run counts for all 6 are in engine_roster.

Cite this leaderboard

How to cite Claude

Machine Relations Index (MRI) by Jaxon Parrott, Machine Relations Research — machinerelations.ai. As of October 25, 2026, Arxiv.org is the most-cited source in Claude answers, cited in 3.74% of 7,188 observed Claude runs. Release mri_score_v2.1+2026-10-25+9c34b2dccc04. https://machinerelations.ai/index/engines/claude. CC BY 4.0.

APA

Parrott, J. (2026). Which sources does Claude cite most? (Version mri_score_v2.1+2026-10-25+9c34b2dccc04) [Data set]. Machine Relations Research. https://machinerelations.ai/index/engines/claude

BibTeX

@misc{parrott2026mriclaude,
  author = {Parrott, Jaxon},
  title = {Which sources does Claude cite most?},
  year = {2026},
  version = {mri\_score\_v2.1+2026-10-25+9c34b2dccc04},
  publisher = {Machine Relations Research},
  url = {https://machinerelations.ai/index/engines/claude},
  license = {CC-BY-4.0},
  note = {Machine Relations Index (MRI) by Jaxon Parrott, Machine Relations Research — machinerelations.ai}
}

CITATION.cff

Which sources does Claude cite most?

Sources ranked by citation rate

Whole-window rates among published segments

What each engine's figures measure

How to cite Claude

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