OpenAI's GPT-5.5 Review: Features & Capabilities

OpenAI continues to raise the bar with each new model. OpenAI's most advanced large language model, GPT-5.5, released on April 23, 2026, has managed to outperform both its predecessor and competitors by a wide margin. GPT-5.5 offers a new level of performance and versatility for both professional and everyday use. If you're curious about the GPT-5.5, keep reading. 

In this article, we will examine the GPT-5.5 and explore its innovations.

TL; DR

OpenAI released GPT-5.5 on April 23, 2026. It outperforms GPT-5.4 and rivals like Opus 4.7 across most benchmarks, while using significantly fewer tokens. Key upgrades include better intent understanding, autonomous task planning and execution, stronger agentic coding, and advanced reasoning. It excels at knowledge work (documents, spreadsheets, presentations), scientific research, and cybersecurity scenarios. The model launches with OpenAI's strongest safety features yet. API pricing is $5 per million input tokens and $30 per million output tokens with a 1M context window, but lower token usage makes it cheaper in practice than its predecessor. Access requires ChatGPT Plus or higher; enterprise users can also reach it through platforms like TextCortex for workflow automation and knowledge management.

What is GPT-5.5?

GPT-5.5 is one of the most advanced large language models developed by OpenAI and released on April 23, 2026. Compared to its predecessor, GPT-5.4, GPT-5.5 can understand user intent much faster and complete more background tasks on its own. Therefore, you don't need to enter complex and lengthy inputs into the GPT-5.5 model. The GPT-5.5 model breaks down complex and lengthy inputs into steps, plans, and executes them. This difference is particularly powerful in fields such as coding, computer use, knowledge work, and scientific research. Furthermore, the GPT-5.5 model was released with OpenAI's most robust safeguard and security features.

How to Access GPT-5.5?

The GPT-5.5 model is available for users with subscriptions at the Plus, Pro, Business and Enterprise levels. In ChatGPT GPT-5.5 Thinking is available to Plus, Pro, Business, and Enterprise users. Codex GPT-5.5 is available for Plus, Pro, Business, Enterprise, Edu, and Go plans with a 400K context window.

If you want to access GPT-5.5 for your enterprise use, workflow automation, and knowledge work, you can access it via TextCortex. TextCortex offers a wide range of major language models, including GPT-5.5, to automate your enterprise workflow and integrate AI into your daily and repetitive tasks. Furthermore, you can manage your token usage and AI costs by setting who in your enterprise can access and use models like GPT-5.5 and Opus 4.7.

GPT-5.5 Pricing and Token Usage

GPT-5.5 charges $5 per million input tokens and $30 per million output tokens with a 1 million context window. But there's a catch. Because the GPT 5.5 model offers significantly lower token usage compared to its predecessor, it actually offers similar pricing. The GPT-5.5 model uses far fewer tokens to achieve the same performance as the GPT-5.4 model. This token efficiency allows the model to produce cheaper output and offers users a more advanced model at a lower cost. If you want to use the model via ChatGPT, you need to subscribe to one of the Plus, Pro, or Enterprise plans.

GPT-5.5 Features and Capabilities 

GPT 5.5 offers users a new benchmark in performance, encoding, and reasoning, along with new capabilities. Let's discover the features and capabilities of GPT-5.5 together.

GPT-5.5 Benchmark Performance

The GPT-5.5 model has managed to outperform both the selfie-focused GPT-5.4 and its competitor, the Opus 4.7, in most benchmarks. For example, in the Terminal-Bench 2.0 benchmark, the GPT-5.5 model achieved a score of 82.7%, outperforming its closest competitor, the GPT-5.4. The GPT-5.5 model has outstanding performance in professional, academic, tool use, computer use, vision, and cybersecurity benchmarks.

Agentic Coding and Engineering

The GPT-5.5 model is one of the most powerful models on the market for agentic coding. It can understand and process complex commands requiring planning, iteration, and tool coordination, solving more problems and completing tasks much better and more efficiently. Furthermore, compared to its predecessor, the GPT-5.4 model, the GPT-5.5 model completes agentic coding tasks much faster, while using fewer tokens, increasing efficiency, reducing costs, and delivering better results.

The GPT-5.5 model performs better than the GPT-5.4 and Cloud Opus 4.7 models in terms of reasoning, autonomy, catching issues in advance, predicting testing, and review needs without explicit prompting.

Knowledge Work

The feature that makes the GPT-5.5 model good at coding also makes it good at knowledge work. Because the GPT-5.5 model is more successful at understanding the user's internet, it can more effectively search for the information the user wants, browse all knowledge bases, use the necessary tools, and convert raw material into useful, insightful outputs by checking the output. Furthermore, the GPT-5.5 model is better at creating documents, spreadsheets, slide presentations, and PDFs than the GPT-5.4 model. In other words, using the GPT-5.5 model, you can search your knowledge bases; you can transform raw data and information into useful outputs and presentations. This new advanced feature of GPT-5.5 makes it useful in departments such as marketing, data science, communications, finance, software engineering, growth, customer support, and human resources.

Scientific Research

In addition to its advanced capabilities, the GPT-5.5 model is also ideal for scientific and technical research workflows. Specifically, the GPT-5.5 model allows you to effectively complete tasks requiring idea exploration, evidence gathering, testing assumptions, interpreting results, and deciding what to do next. In scientific tasks, the GPT-5.5 model delivers better results with fewer tokens compared to the GPT-5.4 model.

GPT-5.5 Security

One of the biggest concerns for artificial intelligence models, especially those used in AI agents, is security issues. The GPT-5.5 model offers advanced cybersecurity with stricter classifiers for potential risks. The OpenAI team provides the GPT-5.5 security framework in collaboration with industry-leading safeguards and government partners to help protect critical infrastructure for the public and cyber defense at every level.

TextCortex AI: Implement GPT-5.5 Into Your Workflow

If you want to automate your workload and save time by integrating a wide range of large language models, including GPT-5.5, into your enterprise workflow, then TextCortex is for you. TextCortex is a leading knowledge management and workflow automation infrastructure that allows you to automate repetitive and mundane tasks and create custom AI agents and skills to automate complex tasks. With TextCortex, you can also take your knowledge management game to the next level, quickly access the information you need, and transform raw material into insightful outputs.

TextCortex Features

TextCortex provides knowledge bases that allow users to upload internal data or connect to databases. With knowledge bases, you can create folders for different data groups. Another TextCortex feature is the AI ​​agent framework, which integrates with knowledge bases. With the TextCortex AI agent builder, you can build AI agents to perform and automate specific tasks, and add your knowledge base data. You can build your AI agents manually with TextCortex or use our AI agent builder feature. Furthermore, TextCortex's wide range of LLM support including Claude Opus 4.7 allows you to choose the optimal large language model for each task.

You can leverage our connectors and skills features to use your AI agents more effectively. With the skills feature, you can create prompt groups for specific actions and tasks and use them modularly in any of your AI agents.

Our connectors feature allows you to integrate third-party apps into your skills or agents. For example, if you want a skill you've created to be activated in Slack, you can integrate Slack with a specific skill using connectors.

Frequently Asked Questions

Is GPT-5.5 out?

The GPT-5.5 model was released on April 23, 2026. Upon its release, you can access it via TextCortex, ChatGPT, and the OpenAI Codex.

Is GPT-5.5 an upgrade?

The GPT-5.5 model offers higher performance than the GPT-5.4 model while requiring fewer tokens.

How much is Chat:GPT-5.5?

To access the GPT-5.5 model, you need to purchase OpenAI's Plus or higher subscription, which costs $20.