OpenAI has announced a limited preview of its new GPT-5.6 series, featuring three models: Sol, Terra, and Luna. Sol is the flagship model, Terra offers balanced performance at a lower cost than previous versions, and Luna is designed for speed and affordability. These models are set to become generally available in the coming weeks, with pricing structured per 1 million tokens and introducing enhanced prompt caching features. AI
IMPACT Sets new pricing tiers and introduces advanced caching for next-generation models.
RANK_REASON Frontier-lab model release with system card.
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