> ## Documentation Index
> Fetch the complete documentation index at: https://hireobi.com/docs/llms.txt
> Use this file to discover all available pages before exploring further.

# How Obi measures AI answers

> How Obi's servers measure what the AI engines answer to your buyer questions, and what a scan keeps.

A scan sends your reviewed buyer questions to the AI engines your plan covers and keeps what each engine answered. It runs on Obi's servers, not in your assistant, and it is the only thing Obi calls a measurement.

## Engines

| Engine | Free plan | Paid plan |
| - | - | - |
| ChatGPT | Included | Included in every pack |
| Gemini | Included | Included in every pack |
| Google AI Overviews | Not included | Included in every pack |
| Claude | Not included | Optional, per pack |
| Perplexity | Not included | Optional, per pack |

Claude and Perplexity measure a subset you choose: up to 10 genuine buying questions per pack, never padded to reach that number. A question measured on ChatGPT is not necessarily measured on every optional engine. See [Plans](https://hireobi.com/docs/plans.md).

## Starting a scan

Before a scan, Obi shows you the question version it will measure, the engines, and the number of question-and-engine cells. It asks you once, and only an explicit yes starts the scan.

If the request times out, Obi reads the current state before trying again, so a paid scan is never sent twice.

## Cadence

* **Free:** one scan a month.
* **Paid:** one scan a week.

## What a scan keeps

Each scan freezes, at its start, the question version and wording, the engines it covers and its server budget. Correcting a question or your business afterwards applies to future scans; it never rewrites a scan already started and never adds a second scan to a week that already has one.

The results hold, for each question and engine:

* the answer the engine gave;
* when it was measured;
* the sources the engine cited.

Obi shows completed and missing cells plainly. An older scan keeps its own date and question version, and Obi never presents it as fresh research.

> [card] [Next: website readiness](https://hireobi.com/docs/how-it-works/readiness.md)


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