According to OpenAI, Sol achieves state-of-the-art results on professional benchmarks while operating with greater token efficiency and lower estimated costs than previous frontier models.
The family also includes Terra and Luna to address varying developer needs.
Terra serves as a balanced multimodal model intended for everyday professional workflows, while Luna is the most cost-efficient and fastest tier, designed for high-volume chat and vision Q&A.
The new models feature a "Programmatic Tool Calling" capability, allowing them to run lightweight code in-memory to coordinate complex tasks more effectively.
Third-party platforms like Wiro AI have already integrated the GPT-5.6 family into their catalogs, offering developers granular control over reasoning effort and verbosity.
This release marks a shift toward more specialized AI distribution, where users can route tasks between different capability tiers based on specific budget and latency requirements.
OpenAI has also implemented updated safety layers, including a reasoning monitor designed to detect potential misuse in real-time.