OpenAI has launched the GPT-5.6 family of models, including Sol, Terra, and Luna, for general availability. The new models offer enhanced performance and efficiency, with Sol achieving state-of-the-art results across coding, knowledge work, cybersecurity, and science while outperforming previous and competing frontier models with fewer tokens and at lower estimated cost. The result is stronger performance per dollar, enabling more successful work for the same spend or comparable results at a lower total cost. OpenAI also introduced a new way to accelerate the most demanding work through the ultra setting, which coordinates multiple agents across parallel workstreams to finish complex tasks faster. Source: openai
GPT-5.6 Sol sets a new high of 53.6 on the Agents’ Last Exam, eclipsing Claude Fable 5 (adaptive reasoning) by 13.1 points. Even at medium reasoning, it beats Fable 5 by 11.4 points at roughly one-quarter the estimated cost. The efficiency extends to smaller models, with GPT-5.6 Terra and Luna outperforming Fable 5 at around one-sixteenth the cost. On the Artificial Analysis Intelligence Index, GPT-5.6 Sol with max reasoning comes within one point of Fable 5 while completing tasks in 61% less time at roughly half the estimated cost. Source: openai
OpenAI emphasized the robust safeguards in GPT-5.6, designed to be resilient against determined and adaptive misuse without broadly limiting legitimate work. Before general availability, the models and safeguards underwent an extensive evaluation period, combining human red teaming with large-scale automated testing. During the preview, OpenAI worked closely with expert organizations and trusted partners to pressure-test defenses and strengthen safeguards before broader launch. The resulting system layers protections trained into the model with real-time checks, monitoring, and access calibrated to trust and risk. Source: openai
