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OpenAI has officially introduced its next-generation AI model family, GPT-5.6, following a limited preview period. Alongside the new models, the company has also expanded ChatGPT beyond a traditional chatbot, transforming it into a more capable AI assistant that can research, plan, organize, and complete real-world tasks.
Here's everything you need to know about GPT-5.6 and why it matters.
Meet the GPT-5.6 Family
Unlike previous releases, GPT-5.6 launches as a family of three models, each named after a celestial body and designed to offer different levels of intelligence, speed, and cost efficiency.
This new naming strategy separates the model generation from the performance tier. While GPT-5.6 identifies the generation, Sol, Terra, and Luna can continue to improve independently over time.
OpenAI positions Sol as its most capable model, with major improvements in coding, professional research, cybersecurity tasks, and web browsing.
OpenAI also claims that Sol delivers these results while using significantly fewer tokens than previous models, helping reduce costs for developers and businesses running large workloads.
Independent benchmark comparisons, however, present a more balanced picture. Some competing AI models still lead on certain coding and reasoning benchmarks, showing that the "best" model often depends on the specific task being measured.
One of the biggest announcements alongside GPT-5.6 is ChatGPT Work, an AI assistant designed to complete real tasks instead of simply answering questions.
It can:
On desktop, OpenAI has also integrated its Codex coding tool directly into ChatGPT and introduced Sites, a feature for building interactive reports and dashboards without separate software.
See how it stacks up against Anthropic in our ChatGPT 5.6 vs Claude Fable 5 comparison.
GPT-5.6 represents a major step toward AI systems that do more than answer questions. Instead of acting like a search engine, ChatGPT is becoming an AI assistant capable of researching, drafting, organizing information, and completing complex tasks with minimal user input.
For most users:
Wondering about regulation? Read how the US government restricted GPT-5.6 and Fable 5.
GPT-5.6 marks another important milestone in the evolution of AI assistants. Whether it becomes your preferred AI tool depends on your needs. Casual users may find Terra more than enough for daily work, while developers, researchers, and technical professionals will likely benefit from Sol's advanced capabilities.
As with any major AI release, it's a good idea to start with the available tier and upgrade only if your workflow requires more advanced features.
GPT-5.6 is OpenAI's latest generation of AI models. It includes three model tiers: Sol, Terra, and Luna, each designed for different levels of performance, speed, and cost.
What is the difference between Sol, Terra, and Luna?
Sol is designed for advanced research, coding, and complex reasoning. Terra is the balanced model for everyday personal and professional tasks, while Luna focuses on speed and affordability for lightweight workloads.
What is ChatGPT Work?
ChatGPT Work is an AI assistant that can connect to apps like Slack, Notion, Google Drive, and Microsoft 365. It can research information, create documents, generate spreadsheets and presentations, and automate multi-step tasks.
Which GPT-5.6 model is available on the free plan?
Free and Go users receive access to Terra. Paid subscribers can choose between Sol, Terra, and Luna.
Is GPT-5.6 better than previous ChatGPT models?
GPT-5.6 introduces improvements in reasoning, coding, research, and task automation. The best model depends on the type of work you need to complete.
Can developers use GPT-5.6 through the API?
Yes. Developers can access all three GPT-5.6 models through the OpenAI API, along with tools for creating advanced AI workflows.
Which GPT-5.6 model should I choose?
Choose Luna for quick everyday tasks, Terra for balanced productivity, and Sol for coding, research, and complex professional work.
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