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Retrieval-augmented generation

BM25 example

Measured weekly since 2026-W25. 12 observations.

Measured 2026-W36 · 2026-08-31 · google.com, gl=us

2026-W36

This week

AI Overview
Showing
in 11 of 12 weeks
Sources cited
4
1 of them not in the top 10
Organic results
9
returned on page one
Weekly churn
9%
of the top 10 changes each week
AI Overview, week by week
2026-W252026-W36
How much the top 10 moved

Google is answering this query itself, and 1 of the 4 sources it credits do not appear in the ten results below.

Citations

What the AI Overview cites

DomainStatusOrganic position
pypi.orgCited and ranking1
en.wikipedia.orgCited and ranking5
hyde.ioCited and ranking2
geeksforgeeks.orgCited, not ranking

A domain marked Cited, not ranking is credited in Google's answer while sitting outside the ten organic results. Across the whole corpus that is true of 38.8% of citations.

Page one

Organic results

#DomainTitleIn the overviewSitelinks
1pypi.orgpypi: BM25 exampleCited
2hyde.ioBM25 example in 2026Cited
3cloudflare.comcloudflare: BM25 exampleNot cited4
4docs.graphrag.comBM25 example | GraphRAG docsNot cited
5en.wikipedia.orgen: BM25 exampleCited
6digitalocean.comBM25 example in 2026Not cited
7substack.comBM25 example in 2026Not cited
8bm25.comBM25 example — BM25Not cited
9news.ycombinator.comBM25 example — newsNot cited
Since 2026-W29

Position history

DomainW29W30W31W32W33W34W35W36
pypi.org11111121
hyde.io23322212
docs.graphrag.com44644444
cloudflare.com32233333
substack.com55456557
en.wikipedia.org66565665

A dot means the domain was not on page one that week. This is the part no live SERP checker can show you: it needs someone to have been measuring before you asked.

Blocks

Features on this page

AI Overview People Also Ask Related searches Knowledge panel Sitelinks

Filled means Google rendered the block for this query this week. AI Overview, People Also Ask, Related searches, Knowledge panel, Sitelinks — each has its own prevalence across all 4,185 queries.

API

Reproduce this page

Every figure above comes from one call. This is that call — the same endpoint, the same parameters, run once a week.

curl --request GET \
  --url 'https://serpens.p.rapidapi.com/api/v1/search_ai_overview?q=BM25%20example&gl=us&hl=en&format=json' \
  --header 'x-rapidapi-host: serpens.p.rapidapi.com' \
  --header 'x-rapidapi-key: YOUR_KEY'

Run it on your own queries

Free tier, no card. The AI Overview endpoint returns the overview, its citations, and the organic results in one response.

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One email each Monday covering BM25 example: what changed in the results, which domains moved, and where AI Overview switched on or off. Unsubscribe in one click.