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GPT-6 Luna pricing is half of what GPT-5.6 Luna cost, and OpenAI says the cut is permanent. When GPT-6 Sol and GPT-6 Luna shipped on 22 September 2026, Luna came in at $0.10 per million input tokens and $0.50 per million output tokens, against $0.20 and $1.20 for GPT-5.6 Luna. For anyone running a WordPress…