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2026

GPT-5.6 Sol, Terra, Luna: New OpenAI Tiers Explained

OpenAI officially previewed GPT-5.6 on June 26, 2026, introducing Sol (frontier reasoning), Terra (balanced, ~half GPT-5.5 cost), and Luna (fast and affordable). Sol Ultra scored 91.9% on Terminal-Bench 2.1. Access is restricted to ~20 government-vetted partners while the US government completes its security review; broad availability is expected within weeks.