---
title: "How many sources do AI engines cite per answer?"
description: "AI engines cite 11.2 sources per answer on average, with Perplexity citing the most at 20.16 and Google AI Overviews citing the fewest at 5.92. The figures come from 10,193 AI answers collected in August 2026."
period: "August 2026"
author: "Preetesh Jain"
---

# How many sources do AI engines cite per answer?

*August 2026 · By [Preetesh Jain](https://zerply.ai/resources/blog/authors/preetesh-jain)*

AI engines cite 11.2 sources per answer on average, with Perplexity citing the most at 20.16 and Google AI Overviews citing the fewest at 5.92. The figures come from 10,193 AI answers collected in August 2026.

| AI engine | Avg sources cited | Responses | MoM change |
| --- | --- | --- | --- |
| Perplexity | 20.16 | 3106 | 0.14 |
| ChatGPT | 11.38 | 1765 | 0.54 |
| Google AI Overviews | 5.92 | 5322 | -6.84 |

The three engines rank clearly. Perplexity cites 20.16 sources per answer, ChatGPT 11.38, and Google AI Overviews 5.92. ChatGPT lands closest to the overall average of 11.2.

Response counts add context. Google AI Overviews supplies 5,322 of the 10,193 answers, Perplexity 3,106, and ChatGPT 1,765. The engine that cites the fewest sources accounts for the largest share of answers.

Month over month, the engines moved in opposite directions. Google AI Overviews fell 6.84 sources per answer, while Perplexity added 0.14 and ChatGPT added 0.54.

A 6.84 drop is large against a value of 5.92. Google AI Overviews cited fewer sources this month than last, and it already cited the fewest of the three.

Perplexity and Google AI Overviews read like different products. Perplexity spreads each answer across 20.16 sources. Google AI Overviews concentrates on 5.92 and tightened further in August.

For anyone earning AI visibility, that changes what a citation is worth. A link inside Google AI Overviews is scarce and getting scarcer. Perplexity leaves far more room, at 20.16 sources per answer.

Treat the two leaders as separate workstreams. Winning a citation in Google AI Overviews means beating out a shrinking field of 5.92 sources, while Perplexity still spreads credit across 20.16. Optimize for each engine, not for the 11.2 average.

## Methodology

- Limited to answers that used web search.
- Average number of cited sources per answer, by AI engine.
- Based on AI answers collected across Zerply customers. This is not a random sample of the open web.
- Covers the previous calendar month.

## FAQ

### How many sources do AI engines cite per answer?

11.2 sources per answer on average, based on 10,193 AI answers collected in August 2026. Perplexity cites the most at 20.16, followed by ChatGPT at 11.38 and Google AI Overviews at 5.92.

### Which AI engine cites the most sources?

Perplexity, with 20.16 sources cited per answer on average. ChatGPT follows at 11.38 and Google AI Overviews at 5.92.

### How did citation counts change from the prior month?

Google AI Overviews fell 6.84 sources per answer, the biggest change in the set. Perplexity rose 0.14 and ChatGPT rose 0.54.

### Does the engine with the most answers cite the most sources?

No. Google AI Overviews supplied 5,322 of the 10,193 answers, more than Perplexity's 3,106 and ChatGPT's 1,765, but it cited the fewest sources per answer at 5.92.

### How far apart are the engines?

The engines sit far apart. Perplexity cites 20.16 sources per answer, ChatGPT 11.38, and Google AI Overviews 5.92, against an overall average of 11.2.