OpenAI Launches GPT-5.5: The Frontier of Agentic Intelligence

Introduction

On April 23, 2026, OpenAI officially unveiled GPT-5.5, establishing it as the smartest and most intuitive language model in the company's history. This release represents a significant leap forward in agentic capabilities, designed not just to answer questions, but to execute complex workflows on a computer autonomously. As a frontier model with undisclosed parameters, GPT-5.5 signals a new era of human-AI collaboration where the machine handles the heavy lifting of reasoning and execution.

The model is positioned as the next step toward a fundamentally new way of getting work done on a computer. Unlike previous iterations, GPT-5.5 focuses heavily on reducing latency while increasing intelligence, ensuring that developers and engineers experience a seamless interaction without sacrificing performance. This rollout marks a critical turning point for the industry, outperforming key competitors like Claude Opus 4.7 and Gemini 3.1 Pro across most professional benchmarks.

• Released: April 23, 2026
• Status: Frontier Model (Undisclosed Parameters)
• Provider: OpenAI

Key Features & Architecture

GPT-5.5 is co-designed, trained with, and served on NVIDIA GB200 and GB300 NVL72 systems, leveraging cutting-edge hardware to achieve unprecedented efficiency. The architecture prioritizes token efficiency, allowing the model to complete tasks using fewer tokens compared to GPT-5.4 while maintaining or improving per-token latency. This efficiency translates to faster response times and lower operational costs for enterprise users.

Security is paramount in this release. The model is proactively deployed with industry-leading cybersecurity safeguards and is classified as High under the OpenAI Preparedness Framework. Additionally, GPT-5.5 Thinking unlocks faster help for harder problems by providing smarter, more concise answers, reducing the cognitive load on the user while maximizing output quality.

• Hardware: NVIDIA GB200 and GB300 NVL72 systems
• Efficiency: Significantly more token efficient than GPT-5.4
• Security: High classification under OpenAI Preparedness Framework

Performance & Benchmarks

The performance metrics for GPT-5.5 are state-of-the-art across a wide array of technical challenges. On Terminal-Bench 2.0, the model achieves an impressive 82.7%, demonstrating superior agentic coding capabilities. In the realm of software engineering, it scores 58.6% on SWE-Bench Pro, solving more tasks end-to-end in a single pass than previous models. Furthermore, it reaches 78.7% on OSWorld-Verified, confirming its ability to operate effectively within real computer environments.

For specialized tasks, GPT-5.5 Pro achieves 90.1% on BrowseComp and 52.4% on FrontierMath Tier 1-3, highlighting its strength in complex reasoning and web navigation. It also scores 84.9% on GDPval and 73.1% on Expert-SWE (Internal), outperforming Claude Opus 4.7 in most coding and professional benchmarks. Notably, the model even helped discover a new proof about Ramsey numbers in combinatorics, which was later verified in Lean, showcasing its potential for scientific discovery.

• Terminal-Bench 2.0: 82.7%
• SWE-Bench Pro: 58.6%
• OSWorld-Verified: 78.7%
• CyberGym: 81.8%
• GeneBench: 25.0%

API Pricing

OpenAI has structured the API pricing to reflect the advanced capabilities and efficiency of GPT-5.5. The standard model costs $5.00 per 1 million input tokens and $30.00 per 1 million output tokens. This pricing model includes a 1 million token context window, allowing for the processing of extensive documents and complex reasoning tasks without truncation.

For users requiring higher performance tiers, GPT-5.5 Pro is available at $30.00 per 1 million input tokens and $180.00 per 1 million output tokens. This tier is essential for high-volume enterprise applications where maximum intelligence and speed are critical. While a free tier is not explicitly detailed for this specific model, Plus, Pro, Business, and Enterprise users gain access through ChatGPT and Codex platforms.

• Standard Input: $5.00 / 1M tokens
• Standard Output: $30.00 / 1M tokens
• Pro Input: $30.00 / 1M tokens
• Pro Output: $180.00 / 1M tokens
• Context Window: 1M tokens

Use Cases

GPT-5.5 is best suited for applications requiring deep reasoning, complex coding, and autonomous agent behavior. Developers can leverage it for end-to-end software development, where it solves tasks in a single pass more effectively than prior models. The model's ability to build interactive 3D worlds, codenamed Spud, makes it a powerful tool for game development and simulation testing.

Cybersecurity professionals will find the model particularly valuable given its High classification and specialized safeguards. It rivals the Mythos model in trusted access for cyber defense, helping defenders spot next-level attacks. Additionally, its 25.0% score on GeneBench indicates strong potential for multi-stage scientific data analysis in genetics, expanding its utility beyond traditional software engineering.

• Agentic Coding and Software Engineering
• Cybersecurity Defense and Threat Detection
• Scientific Data Analysis in Genetics
• Interactive 3D World Building (Spud)

Getting Started

Access to GPT-5.5 is rolling out to Plus, Pro, Business, and Enterprise users within ChatGPT and Codex. Developers can integrate the model via the standard OpenAI API endpoints, utilizing the updated SDKs that support the new token efficiency features. The model is currently available for immediate use by existing subscribers, with enterprise users able to request dedicated access through their account managers.

To begin, navigate to the OpenAI platform dashboard and select the GPT-5.5 model from the available options. Ensure your API keys are configured for the specific pricing tier required. For immediate testing, the Codex interface provides a sandbox environment to experiment with the model's reasoning and coding capabilities before production deployment.

• Available on: ChatGPT and Codex
• Access Tiers: Plus, Pro, Business, Enterprise
• Integration: Standard OpenAI API

API Pricing — Input: $5.00 / 1M tokens / Output: $30.00 / 1M tokens / Context: 1M tokens

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