GPT-5.6 Review: Features & Capabilities

After a long wait, OpenAI released GPT-5.6, its latest and most advanced large language model, on July 9, 2026. GPT-5.6 comes with three different effort settings: Sol, Terra, and Luna. Each model has its own advantages, output generation speed, and different pricing. In ultra mode, GPT-5.6 can coordinate multiple agents and complete complex tasks much faster. If you're curious about what GPT-5.6 promises and its innovations, we've got you covered! 

In this article, we will examine GPT-5.6 and explore its capabilities.

TL ; DR

OpenAI released GPT-5.6 on July 9, 2026, as an advanced model family focused on agentic workflows, reasoning, coding, design, and long-horizon knowledge work. It comes in three variants: Sol, the highest-performance model; Terra, balancing speed and capability; and Luna, optimized for fast, simple, and low-cost tasks. API pricing ranges from $1/$6 per million input/output tokens for Luna to $5/$30 for Sol, while ChatGPT access starts with a $20-per-month Plus subscription. New capabilities include efficiency, maximum, xhigh, and ultra modes, with ultra coordinating four parallel agents; improved computer-assisted design; editable presentations, spreadsheets, and documents; database-driven analysis; and stronger security and vulnerability detection. GPT-5.6 Sol reportedly scores 92.2% on BrowseComp and 62.6% on OSWorld 2.0. TextCortex offers GPT-5.6 as an EU-hosted, GDPR and EU AI Act-compliant model, with AI agents, knowledge bases, monitoring, and enterprise workflow automation.

C'est quoi,5.6?

GPT-5.6 is a large language model developed by OpenAI and released on July 9, 2026, offering advanced agentic capabilities. The model effectively manages multiple sub-AI agents when performing agentic tasks, transmits each agent's output to the necessary locations, assigns separate agents for complex and multi-step tasks, and utilizes new agents as needed. If you use AI agents to automate your workflow and want a smarter and faster AI agent for your complex tasks, you might consider using the GPT-5.6 model.

GPT-5.6 Model Family

The GPT-5.6 model comes with three sub-models optimized for tasks of varying effort levels and intensities: GPT-5.6 Sol, GPT-5.6 Terra, and GPT-5.6 Luna. The GPT-5.6 Sol is the flagship model and offers the highest performance and effort level limits; the GPT-5.6 Terra model provides optimal speed and performance for everyday tasks; and the GPT-5.6 Luna model is the fastest and lowest-latency GPT-5.6 model, optimized for basic and simple tasks, offering the lowest pricing.

How to Access GPT-5.6?

GPT-5.6 is a model that offers advanced performance and new capabilities. The easiest way to access GPT-5.6 is through ChatGPT. You can use GPT-5.6 via ChatGPT Plus or a higher subscription level. Another way to access GPT-5.6 is to use it as an API. You can also access GPT-5.6 through the OpenAI Codex.

A creative and sophisticated way to access the GPT-5.6 model is to use it through TextCortex. With TextCortex, you can use the GPT-5.6 model for everything from knowledge work to automation with AI agents. Moreover, TextCortex offers the GPT-5.6 model as EU-hosted and GDPR compliant.

GPT-5.6 Pricing

If you want to use GPT-5.6 models via ChatGPT, you need a minimum Plus subscription, which charges $20 per month. If you want to use the GPT-5.6 model as an API, you need to pay the following pricing:

• GPT-5.6 Sol: $5 per million input tokens / $30 per million output tokens
• GPT-5.6 Terra: $2.5 per million input tokens / $15 per million output tokens
• GPT-5.6 Luna: $1 per million input tokens / $6 per million output tokens

GPT-5.6 Features & Capabilities: What’s New?

The GPT-5.6 model comes with new features and performance standards. If you're wondering what the GPT-5.6 offers and what's new compared to its predecessor, the GPT-5.5, we've prepared a list for you!

Efficiency and Max Modes

GPT-5.6 models operate in efficiency mode by default, generating the most optimized output with minimum token expenditure. You can use GPT-5.6 models beyond the default performance at maximum settings. The GPT-5.6 Sol model, in maximum reasoning performance mode, has higher reasoning than the Fable 5 model, while operating in half the time and at half the token expenditure. In this context, the GPT-5.6 model is superior to the Fable 5 model, while the GPT-5.6 Luna model outperforms the Opus 4.8 model, each having a third lower cost than its counterpart.

The GPT-5.6 model offers xhigh and ultra modes to deliver performance beyond the max mode. While the GPT-5.6 xhigh mode uses more tokens, it spends more time examining all processes and outputs more thoroughly through reasoning. The GPT-5.6 ultra mode coordinates four parallel agents, providing stronger and faster results despite increased token usage.

Better and Richer Deasigns

The GPT-5.6 model offers more tasteful, ergonomic, and functional designs compared to its predecessors in design judgment and final output generation. Thanks to the computer use capabilities of the GPT-5.6 model, it can inspect and refine rendered results, thus capturing visual and functional issues and applying finishing touches before handing the work back. With the GPT-5.6 model, you can complete a wide range of design work, from games to website designs, in an enhanced manner.

Additionally, with the GPT-5.6 model, you can turn natural language requests into interactive explanations and visuals.

End-to-end Knowledge Work

GPT-5.6 delivers better results in completing professional tasks requiring knowledge and databases. It can analyze and generate insights or systematic documentation from your documents and everyday workspaces and databases like Slack, Notion, Microsoft 365, Google Drive, and much more. The knowledge work capabilities of the GPT-5.6 model are evident in long-horizon tasks such as professional analysis, browsing, tool use, and computer use. The GPT-5.6 Sol model demonstrates its knowledge work capabilities with a score of 92.2% in the BrowseComp benchmark and 62.6% in OSWorld 2.0, while also consuming 85% fewer output tokens compared to the Claude Opus 4.8 model.

One of the innovations and advantages of the GPT-5.6 model is its spreadsheet, document, and presentation capabilities. With GPT-5.6, you can create fully editable presentations or spreadsheets with your desired narrative layout, hierarchy, and design. Furthermore, GPT-5.6 is better than GPT-5.5 at updating detailed graphics and creating more visually engaging and informative graphs and tables based on given data.

GPT-5.6 Safety and Security

With each new model release, OpenAI strengthens the security and safety functions of the GPT series. The GPT-5.6 model is effective in critical defense tasks such as secure code inspection, patching, threat modeling, and blue team building. As the model's capabilities increase, it becomes stronger in finding and fixing vulnerabilities, autonomous against enhanced targets, and in implementing security measures such as end-to-end encryption. Considering that attackers also use LLMs to find vulnerabilities, GPT-5.6 was developed to adapt quickly as new attacks emerge. According to OpenAI's article, the GPT-5.6 model blocks 10 times more security threats than its predecessor.

TextCortex AI: Integrate GPT-5.6 Into Your Business

If you want to quickly and easily deploy the GPT-5.6 model to your enterprise to automate your workflow and enhance your knowledge work, TextCortex is the solution for you. TextCortex is a leading knowledge management and workflow automation tool that aims to reduce the workload of enterprises by providing them with smart knowledge management, AI search, a personal assistant, and automation via AI agents.

EU-Hosted GPT-5.6 Support

TextCortex offers users multiple LLMs, including GPT-5.6 models, that are EU-hosted and GDPR and EU AI Act-compliant. If you want to use frontier AI models, including GPT-5.6, in your EU-region enterprise, the TextCortex API meets your needs. With the TextCortex API, you can access a wide range of frontier and alternative models, including GPT-5.6. TextCortex also provides monitoring and security options, allowing you to continuously monitor the security of your app.

GPT-5.6 Powered AI Agents

With TextCortex, you can build AI agents that use one of the GPT-5.6 models as the default. The TextCortex AI agent builder allows you to select your desired LLM as the default and optimize it for your specific tasks. This way, you can leverage the GPT-5.6 model, which has strong reasoning and long-horizon knowledge work capabilities, to automate your specific tasks. Furthermore, the TextCortex AI agent builder allows you to save tokens by selecting the optimal LLM for each task.

GPT-5.6 Powered Knowledge Bases

TextCortex comes with knowledge bases that allow you to upload your internal data or connect your databases. This feature lets you integrate your enterprise data into TextCortex AI, making any knowledge work AI-powered. Once you connect your databases to TextCortex, you can generate graphs, tables, documents, presentations, spreadsheets, insights, and analysis reports from your databases using the GPT-5.6 model.

Questions fréquemment posées

Is GPT-5.6 the best?

GPT-5.6 is widely considered one of the most capable models for agentic tasks, reasoning, complex coding, and knowledge work. However, it isn't universally the best for everything.

Is GPT-5.6 really that good?

The quality of the GPT-5.6 model depends on how and for what purpose you use it. If you're going to use the GPT-5.6 model for enterprise tasks like knowledge work, multi-step reasoning, complex coding, and design generation, then it is a really good model.

Is GPT-5.6 launched? 

Yes, OpenAI released GPT-5.6 on July 9, 2026. With the release of GPT-5.6, the ChatGPT chatbot, ChatGPT Codex, ChatGPT Work, API, and TextCortex AI are all accessible and available.

Is ChatGPT-5.6 free to use?

No, to use ChatGPT-5.6 you need a ChatGPT Plus or higher subscription.