OpenAI has announced the GPT-5.6 series, featuring three new models: Sol, Terra, and Luna. Sol is the flagship model, Terra offers a balance of performance and cost, and Luna is designed for speed and affordability. These models are currently in a limited preview with trusted partners, with broader availability expected in the coming weeks. Pricing for GPT-5.6 is set per 1 million tokens, with Sol at $5 input/$30 output, Terra at $2.50 input/$15 output, and Luna at $1 input/$6 output. The series also introduces enhanced prompt caching features. AI
IMPACT Sets new pricing tiers and introduces enhanced caching for OpenAI's flagship models, potentially influencing competitor strategies.
RANK_REASON Frontier-lab model release with system card. [lever_c_demoted from frontier_release: ic=2 ai=1.0]
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