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Retrieval-augmented generation

BM25 vs embeddings

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 12 of 12 weeks
Sources cited
4
2 of them not in the top 10
Organic results
10
returned on page one
Weekly churn
17%
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 2 of the 4 sources it credits do not appear in the ten results below.

Citations

What the AI Overview cites

DomainStatusOrganic position
rapidjournal.blogCited and ranking2
hashnode.devCited and ranking3
reddit.comCited, not ranking
zapier.comCited, 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
1docs.hyde.ioA practical guide to BM25 vs embeddingsNot cited
2rapidjournal.blogA practical guide to BM25 vs embeddingsCited
3hashnode.devA practical guide to BM25 vs embeddingsCited
4rag.comA practical guide to BM25 vs embeddingsNot cited
5aws.amazon.comBM25 vs embeddings | aws docsNot cited
6geeksforgeeks.orgBM25 vs embeddings — geeksforgeeksNot cited
7github.comBM25 vs embeddings — githubNot cited
8youtube.comBM25 vs embeddings | youtube docsNot cited
9digitalocean.comA practical guide to BM25 vs embeddingsNot cited
10freecodecamp.orgBM25 vs embeddings | freecodecamp docsNot cited
Since 2026-W29

Position history

DomainW29W30W31W32W33W34W35W36
docs.hyde.io11111111
rapidjournal.blog22222222
hashnode.dev33433333
rag.com45344544
aws.amazon.com54555455
geeksforgeeks.org67666766

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%20vs%20embeddings&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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Get this measurement every week

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