Why does Aiprobase publish its sources?

Because we ask AI systems to trust structured, verifiable data — so our own claims should meet the same standard. Every statistic on our site links back to this page, and every entry here links to the original research.

How often are these figures verified?

Each entry shows the date it was last verified. We update figures when sources publish new data — the date on each entry shows exactly how fresh it is.

Can I cite these statistics?

Yes — cite the original source listed in each entry, not Aiprobase. Anchor links (aiprobase.com/sources#entry-name) are permanent and safe to reference.

What happens when a number changes?

We update this page and every page on our site that uses the figure on the same day, and note the change in the entry.

Sources

Every statistic published on aiprobase.com is listed here with its original source and the date we last verified it. If a number appears on our site, you can trace it on this page. If a source updates or retracts a figure, we update or retract it too.

How to read this page

Each entry shows the claim as it appears on our site, the original source with a direct link, what the source actually measured, and when we last checked it. Every entry has a permanent anchor link — cite any figure as aiprobase.com/sources#anchor-name.

ChatGPT prompt volume

• Claim as used on our site: "2.5B prompts a day handled by ChatGPT alone"
• Appears on: Home — "When people ask AI" section
• Source: OpenAI disclosure to Axios, 21 July 2025 — reported by Axios ("ChatGPT users send 2.5 billion prompts a day") and TechCrunch: https://techcrunch.com/2025/07/21/chatgpt-users-send-2-5-billion-prompts-a-day/ — reaffirmed in OpenAI's usage research paper "How People Use ChatGPT" (with NBER), September 2025
• What the source measured: Global daily prompts across the ChatGPT product — roughly 18 billion messages per week across 700 million weekly users at the time of reporting. This remains OpenAI's most recent officially confirmed daily figure; the company has since reported over 900 million weekly active users, so current volume is likely higher.
• Last verified: 2026-07-02

Organic CTR decline on queries with AI Overviews

• Claim as used on our site: "61% drop in organic click-through rates on queries where AI summaries appear"
• Appears on: Home — "Google traffic is declining" card
• Source: Tracy McDonald, "AIO Impact on Google CTR: September 2025 Update", Seer Interactive, 4 November 2025 — https://www.seerinteractive.com/insights/aio-impact-on-google-ctr-september-2025-update
• What the source measured: 3,119 informational queries across 42 organizations (25.1M organic impressions), June 2024 – September 2025. Organic CTR on queries with AI Overviews fell from 1.76% to 0.61% — a 61% decline. Queries without AI Overviews also declined (−41%), suggesting a broader shift away from clicking. Independent studies (Ahrefs, Pew Research, SISTRIX) found the same direction with different magnitudes.
• Last verified: 2026-07-02

Organization markup coverage

• Claim as used on our site: "Only about 7% of web pages describe the organization behind them"
• Appears on: Home — "The window is open" card
• Source: Structured data", The 2024 Web Almanac, HTTP Archive — https://almanac.httparchive.org/en/2024/structured-data
• What the source measured: Analysis of millions of crawled pages. JSON-LD structured data appears on 41% of pages, but the most common types are page-level boilerplate (WebSite: 12.7%, BreadcrumbList). Organization markup appears on 7.16% of pages and LocalBusiness on 3.97% — the gap our claim refers to is completeness of business-entity data, not the presence of markup in general.
• Last verified: 2026-07-02

Accuracy of AI search answers

• Claim as used on our site: "More than 60% of AI search answers contained incorrect information; ChatGPT Search answered incorrectly in 67% of test queries (134 of 200)"
• Appears on: About — "Why Aiprobase Exists"
• Source: Klaudia Jaźwińska & Aisvarya Chandrasekar, "AI Search Has a Citation Problem", Tow Center for Digital Journalism, Columbia Journalism Review, March 2025 — https://www.cjr.org/tow_center/we-compared-eight-ai-search-engines-theyre-all-bad-at-citing-news.php
• What the source measured: 1,600 queries across eight generative search tools, each asked to identify a news article's headline, publisher, date, and URL from an excerpt. Collectively the tools answered more than 60% of queries incorrectly; error rates ranged from 37% (Perplexity) to 94% (Grok 3), with ChatGPT Search at 67% (134 of 200). The study also found the tools rarely declined to answer when uncertain.
• Last verified: 2026-07-02

Amazon advertising revenue

• Claim as used on our site: "Amazon generated $56.2 billion in advertising revenue in 2024"
• Appears on: About — competition / paid placement section
• Source: Amazon.com, Inc., "Amazon.com Announces Fourth Quarter Results", 6 February 2025 — https://ir.aboutamazon.com/news-release/news-release-details/2025/Amazon-com-Announces-Fourth-Quarter-Results/
• What the source measured: Amazon reports Advertising services revenue quarterly in the "Supplemental Financial Information and Business Metrics" table of this release: Q1 $11,824M + Q2 $12,771M + Q3 $14,331M + Q4 $17,288M = $56,214M for full-year 2024. The annual figure is also stated directly in Amazon's FY2024 Form 10-K (SEC EDGAR), revenue disaggregation note — preferable as a second link since it shows the annual total without arithmetic.
• Last verified: 2026-07-02

Cloudflare blocks AI crawlers by default

• Claim as used on our site: "Cloudflare now blocks AI crawlers by default for new domains, and many hosts restrict them out of the box. Allowing AI crawlers takes deliberate configuration."
• Appears on: Why Aiprobase — comparison table footnote
• Source: Cloudflare, "Content Independence Day: no AI crawl without compensation!", 1 July 2025 — https://blog.cloudflare.com/content-independence-day-no-ai-crawl-without-compensation/ — and press release: https://www.cloudflare.com/press/press-releases/2025/cloudflare-just-changed-how-ai-crawlers-scrape-the-internet-at-large/
• What the source measured: Policy change: new domains onboarded to Cloudflare have AI crawlers blocked by default unless the owner explicitly allows them; existing customers were offered one-click blocking. Cloudflare serves a significant share of all web traffic, so the default affects a meaningful portion of new websites.
• Last verified: 2026-07-02

ChatGPT Search relies on Bing's index

• Claim as used on our site: "Updates reach Bing — and through it, ChatGPT Search — in minutes" (Verified tier, IndexNow)
• Appears on: Home — How it works, step 3; Why Aiprobase — indexing card
• Source: OpenAI Help Center, "ChatGPT Search" — https://help.openai.com/en/articles/9237897-chatgpt-search (describes third-party search providers); supporting: OpenAI VP of Engineering on Bing's role, CNBC, 31 October 2024 — https://www.cnbc.com/2024/10/31/openai-launches-chatgpt-search-competing-with-google-and-perplexity.html; Microsoft Bing, IndexNow protocol — https://www.indexnow.org
• What the source measured: OpenAI documents that ChatGPT Search uses third-party search providers, including Microsoft Bing, to retrieve web results. Bing participates in the IndexNow protocol, which accepts direct URL submission for indexing. Our claim describes this mechanism; indexing speed is controlled by Bing, not by Aiprobase.
• Last verified: 2026-07-02

AI agents act on the web

• Claim as used on our site: "OpenAI's agent can already navigate websites and fill shopping baskets"
• Appears on: About — "Why Aiprobase Exists"
• Source: OpenAI, Operator announcement, January 2025 — https://openai.com/index/introducing-operator/
• What the source measured: Product announcement of an agent that uses its own browser to perform tasks on websites — navigating pages, filling forms, and completing multi-step actions on a user's behalf.
• Last verified: 2026-07-02

UK data protection framework

• Claim as used on our site: "Aiprobase complies with UK GDPR and the Data (Use and Access) Act 2025"
• Appears on: About — "Your Rights Under GDPR"; Privacy Policy
• Source: Data (Use and Access) Act 2025 (c. 18), Royal Assent 19 June 2025 — https://www.legislation.gov.uk/ukpga/2025/18
• What the source measured: Statutory reference. The Act amends the UK GDPR, the Data Protection Act 2018, and PECR; its data protection provisions are in force.
• Last verified: 2026-07-02

How we maintain this page

We re-verify every figure on this page quarterly, and immediately when a source publishes an update. When a number changes, we update it on this page and everywhere it appears on our site on the same day. Retired claims are struck through, not deleted, with a note explaining what changed. Questions about any figure: [email protected]