---
title: "OpenAI GPT 5.5 Instant Launched"  
description: "GPT-5.5 Instant was officially released on May 5, 2026, as the new default model for ChatGPT worldwide. It replaces GPT-5.3 Instant, providing a smart"  
author: "Anubhav Sharma"  
published: 2026-05-07  
updated: 2026-05-07  
canonical: https://www.mindstick.com/news/4773/openai-gpt-5-5-instant-launched  
category: "artificial intelligence"  
tags: ["artificial intelligence"]  
reading_time: 2 minutes  

---

# OpenAI GPT 5.5 Instant Launched

**GPT-5.5 Instant** was officially released on **May 5, 2026**, as the new default model for ChatGPT worldwide. It replaces **GPT-5.3 Instant**, providing a smarter, more personalised [experience](https://www.mindstick.com/articles/12276/how-timely-order-deliveries-can-improve-customer-experience) for both free and paid users.

## Key Improvements & Features

- **Reduced Hallucination**: [OpenAI](https://deploymentsafety.openai.com/gpt-5-5-instant/cve-bench) claims the model significantly cuts down on incorrect information, particularly in high-stakes fields like law, medicine, and finance.
- **Token [Efficiency](https://www.mindstick.com/articles/13091/12-tips-to-boost-your-studying-efficiency)**: While more expensive per token, it is more "token-efficient," using **30.2% fewer words** and **29.2% fewer lines** to complete the same tasks compared to [previous versions](https://www.mindstick.com/forum/157962/what-is-bootstrap-5-and-how-does-it-differ-from-previous-versions-of-bootstrap).
- **Enhanced Context & Personalization**: The model can now pull context more effectively from past conversations, [uploaded files](https://www.mindstick.com/forum/34650/how-can-download-uploaded-files-in-mvc), and connected Gmail accounts to provide tailored suggestions.
- **[Benchmarking](https://answers.mindstick.com/qa/34589/what-is-benchmarking) Success**: It achieved a score of **81.2** in the **AIME 2025 math test** (up from 65.4 in GPT-5.3) and outperformed its predecessors in multimodal reasoning.
- **Knowledge Cutoff**: The model's [training data](https://answers.mindstick.com/qa/116715/explain-the-importance-of-training-data-and-testing-data) includes information up to **August 2025**.

## The Wider GPT-5.5 Ecosystem

The "Instant" release follows the launch of the more powerful **GPT-5.5 Thinking** and **GPT-5.5 Pro** on April 23, 2026.

- **GPT-5.5 Thinking**: Designed for complex, multi-step agentic work, including advanced coding and [scientific research](https://answers.mindstick.com/qa/107875/summarize-the-recent-breakthroughs-in-scientific-research).
- **GPT-5.5 Pro**: Aimed at [enterprise](https://www.mindstick.com/blog/246/enterprise-java-beans-ejb) users, offering extended reasoning and expert-level accuracy for [professional](https://www.mindstick.com/articles/13107/scaling-the-gap-between-a-graduate-and-a-professional) workflows.

---

Original Source: https://www.mindstick.com/news/4773/openai-gpt-5-5-instant-launched

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