# Defined agent win-rate measurement

> You define agent win rate for your catalog and measure it with a fixed prompt set across ChatGPT, Gemini and Perplexity, reporting a range with stated sampling rather than a single confident number.

<!-- Canonical: https://agentmint.net/signals/agent-win-rate-measurement/ · Signal in the AgentMint.net Signals Database · Evidence: hypothesis (Low confidence) · Last verified 2026-07-08 · Evidence types are load-bearing: spec-fact | reported | hypothesis (no measured). -->

- **Affects (funnel stage):** Choice
- **Evidence:** hypothesis
- **Confidence:** Low
- **Impact:** 3/3
- **Status:** active
- **Last verified:** 2026-07-08

## Per-platform status

Undocumented platforms show "unknown" - honest unknowns, never invented.

| Platform | Status | Notes | Source |
| --- | --- | --- | --- |
| ChatGPT | unknown | Not documented by this platform. | - |
| Gemini / Google AI Mode | unknown | Not documented by this platform. | - |
| Perplexity | unknown | Not documented by this platform. | - |
| Copilot | unknown | Not documented by this platform. | - |
| Claude | unknown | Not documented by this platform. | - |

## Evidence and sources

This is a hypothesis (our own inference); no external source is cited.

## How to act on this

Write a win-rate definition and sample size, run a fixed prompt set against each engine on the same day, and report a range, not a bare point figure.

### Related checklist items
- [Run the manual agent-win-rate protocol across ChatGPT, Gemini, and Perplexity.](https://agentmint.net/tools/agent-selection-checklist/#b-measurement-01) (Selection)
- [Define agent win rate for your catalog and measure it with honest error bars.](https://agentmint.net/tools/agent-selection-checklist/#b-measurement-04) (Selection)

### Related signals
- [Re-test after every major model update](https://agentmint.net/signals/retest-on-model-updates/)
- [Audit grid position bias per provider](https://agentmint.net/signals/position-bias-audit/)
- [Track AI-answer presence, not just referrals](https://agentmint.net/signals/answer-presence-tracking/)