---
title: "GPT-5.5 Instant becomes ChatGPT's default model"
description: "OpenAI released GPT-5.5 Instant, replacing GPT-5.3 Instant, with search that can reference past chats, files and Gmail."
url: https://kurddevelopers.com/en/news/openai-gpt-5-5-instant-default-chatgpt
language: en # English
type: news
published: 2026-05-05T17:00:00.000Z
updated: 2026-11-02T04:14:05.000Z
author: "Osamah Ismail"
author_url: https://kurddevelopers.com/en/author/1
section: "AI"
tags: ["OpenAI","ChatGPT","GPT-5.5","AI"]
sources: ["TechCrunch","OpenAI"]
image: https://kurddevelopers.com/uploads/2026/11/memory-update-845867b9.jpg
translations:
  ku: https://kurddevelopers.com/news/openai-gpt-5-5-instant-default-chatgpt
  ar: https://kurddevelopers.com/ar/news/openai-gpt-5-5-instant-default-chatgpt
publisher: Kurd Developers
publisher_url: https://kurddevelopers.com/
---

# GPT-5.5 Instant becomes ChatGPT's default model

> OpenAI released GPT-5.5 Instant, replacing GPT-5.3 Instant, with search that can reference past chats, files and Gmail.

![Image: OpenAI](https://kurddevelopers.com/uploads/2026/11/memory-update-845867b9.jpg)

## What's new
OpenAI released **GPT-5.5 Instant**, now the default model in ChatGPT, replacing **GPT-5.3 Instant**.

## Benchmarks
| Test | GPT-5.5 Instant | Previous model |
|---|---|---|
| AIME 2025 | 81.2 | 65.4 |
| MMMU-Pro | 76 | 69.2 |

## Features
- Search can reference **past chats**, **files** and **Gmail**.
- ChatGPT now shows which memory sources it used.
- API name: **chat-latest**.

## Availability
- First for **Plus** and **Pro** users on the web.
- Free, Go, Business and enterprise users in the coming weeks.
- GPT-5.3 stays available to paid users for three months.

**Sources:** TechCrunch, OpenAI

---

Published by [Kurd Developers](https://kurddevelopers.com/) on 2026-05-05. Cite as: “GPT-5.5 Instant becomes ChatGPT's default model”, Kurd Developers, https://kurddevelopers.com/en/news/openai-gpt-5-5-instant-default-chatgpt