---
title: "How repeatable are OpenAI API outputs when I reuse the same seed?"  
description: "How repeatable are OpenAI API outputs when I reuse the same seed?"  
author: "Magdalena Michalska"  
published: 2026-10-22  
updated: 2026-10-22  
canonical: https://www.mindstick.com/forum/162756/how-repeatable-are-openai-api-outputs-when-i-reuse-the-same-seed  
category: "OpenAI API"  
tags: ["OpenAI", "api(s)", "Model testing", "Reproducibility"]  
reading_time: 1 minute  

---

# How repeatable are OpenAI API outputs when I reuse the same seed?

I’m trying to make a small evaluation set where I can compare prompt changes without unrelated output variation getting in the way. If I send the same request to the same OpenAI model with identical settings and a fixed seed, should I expect the response to match exactly?

I’m curious how much repeatability people actually see across repeated calls, and whether model updates or other API-side changes can still affect the result.


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Original Source: https://www.mindstick.com/forum/162756/how-repeatable-are-openai-api-outputs-when-i-reuse-the-same-seed

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