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GPT-5.6 Preview System Card - OpenAI Deployment Safety Hub

deploymentsafety.openai.com · 8,869 words · saved by 1 readers

GPT-5.6 is a new family of three models: Sol, our new flagship model; Terra, a capable lower-cost option; and Luna, our fastest and most cost-efficient model. The safeguards we have built for this launch -- our most robust yet -- are built to deliver these models safely and at scale, around the world.

Change log August 19, 2026: We corrected GPT-5.5’s pass@4 score on the hard-negative protein binding prediction evaluation from 0.4% to 1.5%. The previously reported value was its pass@1 score. 1. Introduction GPT-5.6 is a new family of three models: Sol, our new flagship model; Terra, a capable lower-cost option; and Luna, our fastest and most cost-efficient model. The safeguards we have built for this launch—our most robust yet—are built to deliver these models safely and at scale, around the world. We believe in broad access, and we plan to make GPT-5.6 Sol, Terra, and Luna generally…

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