---
title: "Which OpenAI Responses API event signals that a streamed answer is finished?"  
description: "Which OpenAI Responses API event signals that a streamed answer is finished?"  
author: "Eetu Saarinen"  
published: 2026-10-26  
updated: 2026-10-26  
canonical: https://www.mindstick.com/forum/162942/which-openai-responses-api-event-signals-that-a-streamed-answer-is-finished  
category: "OpenAI API"  
tags: ["OpenAI", "api(s)", "streaming", "developer tools"]  
reading_time: 1 minute  

---

# Which OpenAI Responses API event signals that a streamed answer is finished?

I’m building a client around the OpenAI Responses API and want to handle streamed output cleanly. The event stream can include text as well as tool-call activity, so I’m unsure which event my interface should treat as the definitive end of a response.

For anyone who has implemented **Responses API streaming events**: how do you tell the difference between a completed response, an incomplete one, and a response that is handing off to a tool? I’d especially like to hear how you avoid showing a “done” state too early.


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Original Source: https://www.mindstick.com/forum/162942/which-openai-responses-api-event-signals-that-a-streamed-answer-is-finished

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