GPT‑5.6 Luna will cost 80% less, while GPT‑5.6 Terra will cost 20% less.
Summary
GPT-5.6 Luna and Terra models are announced with significant price reductions: Luna costs 80% less and Terra 20% less than previous versions.
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Quoting OpenAI
OpenAI announces limited preview of GPT‑5.6 series including Sol, Terra, and Luna models, with new pricing and caching features.