OpenAI Launches GPT-5.6 Family With Three Tiers: Sol, Terra and Luna

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OpenAI released the GPT-5.6 model family on July 9, 2026, comprising three distinct models designed to serve different deployment needs across ChatGPT and its API. Sol targets advanced professional workloads, Terra balances capability with cost, and Luna is optimized for high-volume, cost-sensitive tasks. A subsequent pricing update on July 30, 2026 cut Luna prices by roughly 80% and Terra prices by around 20%, significantly changing the economics for high-volume API users. OpenAI also announced the planned phase-out of older GPT-4o and GPT-4.x models, pushing customers toward the newer GPT-5.x generation. The launch reflects a broader strategy to consolidate OpenAI's model portfolio into clearer deployment tiers rather than offering a single general-purpose release.

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