# What does an average top-three overlap of 2.8 mean? | Trakkr Research

Canonical URL: https://trakkr.ai/trakkr-research/model-divergence/answers/what-does-an-average-top-three-overlap-of-two-point-eight-mean
Published: 2026-03-11
Last updated: 2026-03-11
Author: Mack Grenfell

It means models overlap meaningfully but not completely. On average, the top-three recommendation sets share 2.8 entries, which still leaves enough room for important ranking and inclusion differences.

## Methodology

Built from 797,644 valid comparisons across 44,088 reports and 8 models, covering 6,439,133 model responses in the observed window.

## Direct Answer

Mostly, it means models overlap meaningfully but not completely. On average, the top-three recommendation sets share 2.8 entries, which still leaves enough room for important ranking and inclusion differences.

## What this means

Understanding this overlap metric turns a study finding into an operating rule teams can use when they decide what to publish, refresh, or measure next, particularly given the 43.3% average agreement rate.

## Evidence table

| Metric | Value | Why it matters |
| --- | --- | --- |
| Average top 3 overlap | 2.8 | Average overlap among top-three results across models. |
| Average agreement | 43.3% | Mean cross-model agreement rate. |

## Frequently Asked Questions

### How much do different AI models agree on average?

The mean cross-model agreement rate is 43.3%.

### Why should we avoid using one AI platform to measure total market visibility?

Because an average top-three overlap of 2.8 indicates that models do not return identical recommendation sets, meaning visibility on one platform does not guarantee visibility on others.

## What to do next

- [Track visibility across multiple models instead of using one platform as a proxy for the whole market.](https://trakkr.ai/trakkr-research/model-divergence/answers/what-does-an-average-top-three-overlap-of-two-point-eight-mean#next-step-1)
- [Prioritize query classes where disagreement is highest because that is where share can move fastest.](https://trakkr.ai/trakkr-research/model-divergence/answers/what-does-an-average-top-three-overlap-of-two-point-eight-mean#next-step-2)
- [Treat consensus as a benchmark, but treat divergence as the operating reality.](https://trakkr.ai/trakkr-research/model-divergence/answers/what-does-an-average-top-three-overlap-of-two-point-eight-mean#next-step-3)

## Related pages

Continue through the same study cluster.

- [should you use one model as a proxy for all ai visibility](https://trakkr.ai/trakkr-research/model-divergence/answers/should-you-use-one-model-as-a-proxy-for-all-ai-visibility) - Related answer page
- [why do models disagree so much even on common categories](https://trakkr.ai/trakkr-research/model-divergence/answers/why-do-models-disagree-so-much-even-on-common-categories) - Related answer page
- [general prompts are less stable than comparisons](https://trakkr.ai/trakkr-research/model-divergence/facts/general-prompts-are-less-stable-than-comparisons) - Related fact page
- [cross model consensus tracker](https://trakkr.ai/trakkr-research/model-divergence/trackers/cross-model-consensus-tracker) - Related tracker page

## Data And Sources

- [Same Question, Different AI, Different Answers](https://trakkr.ai/trakkr-research/model-divergence) - Flagship study behind this page
- [Page JSON](https://trakkr.ai/data/research-answers/model-divergence/answers/what-does-an-average-top-three-overlap-of-two-point-eight-mean.json) - Machine-readable companion file