GPT-5.6: Frontier Intelligence That Scales With Your Ambition

OpenAI has officially released the GPT-5.6 model family, consisting of the new flagship model Sol, the everyday-use model Terra, and the cost-efficient Luna. This model family focuses on increasing intelligence per token and maximizing cost-to-performance.

GPT-5.6 Sol achieved SOTA (State-of-the-art) in coding, knowledge work, cybersecurity, and science. Notably, it scored 53.6 on Agents' Last Exam, significantly outperforming Claude Fable 5, and on the Artificial Analysis Intelligence Index, it delivered performance close to competing models while using less time and cost.

Key features include:

• ultra mode: The top-performance setting that coordinates multiple agents across parallel workstreams to complete complex tasks quickly.
• Enhanced coding capability: Set a new benchmark with a score of 80 on the Artificial Analysis Coding Agent Index, while dramatically reducing token usage and cost compared to previous models.
• Programmatic Tool Calling: The model can directly write and execute lightweight programs using tools, filter intermediate data, and adjust workflows on its own.

In addition, this release includes robust Safeguards to counter malicious misuse, with protective layers trained into the model itself through human red-teaming and large-scale automated testing.