OpenAI has officially introduced GPT-5.6, its latest family of AI models, expanding its lineup with three new versions designed for different workloads and budgets.
The new series includes Sol, the flagship model for demanding tasks, Terra as the mid-range option, and Luna as the most affordable choice. Together, the models are built to deliver stronger performance across enterprise work, software development, and scientific research while improving efficiency over previous generations.
According to OpenAI CEO Sam Altman, the new models are significantly more efficient and cost-effective than earlier releases. He recently said that Sol is 54% more token-efficient for AI coding tasks, allowing developers to complete complex programming work using fewer resources while maintaining high performance.
OpenAI is also highlighting GPT-5.6 as its most capable cybersecurity model so far. The company says it delivers frontier-level performance while using significantly fewer tokens and is designed to support defensive security work such as threat modeling, code review, vulnerability patching, and blue team exercises that help organizations identify weaknesses before attackers can exploit them.
The cybersecurity capabilities attracted attention even before launch after reports that the Trump administration had pushed to delay the rollout because of concerns that advanced AI models could potentially be misused. Despite those concerns, OpenAI says GPT-5.6 is focused on strengthening defensive security operations for businesses and organizations.
Alongside the new models, OpenAI announced ChatGPT Work, a new productivity tool built for enterprise teams. Available on desktop, web, and mobile, the app is designed to assist employees with everyday office tasks, including creating documents, spreadsheets, and presentations, making ChatGPT a more integrated workplace assistant.
The launch comes during an increasingly competitive week for the AI industry, following new announcements from rivals SpaceXAI and Meta. However, OpenAI appears to be positioning GPT-5.6 directly against Anthropic, which has gained momentum in the enterprise AI market with its business-focused strategy.
To support its performance claims, OpenAI pointed to results from the Artificial Analysis Coding Agent Index. The company says Sol achieved a score of 80, outperforming Anthropic’s Fable 5 by 2.8 points while using less than half the output tokens, completing tasks in less than half the time, and costing about one-third less. OpenAI also claims Terra performs slightly ahead of Fable 5, while Luna surpasses Opus 4.8 on the same benchmark.
GPT-5.6 is now available through ChatGPT, Codex, and the OpenAI API. Pricing starts at $5 per million input tokens and $30 per million output tokens for Sol, $2.50 input and $15 output for Terra, and $1 input and $6 output for Luna.
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