OpenAI Cuts API Prices on Its Two Cheaper GPT-5.6 Tiers

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OpenAI lowered the API price of its two lower-cost GPT-5.6 models on July 30, 2026, cutting the cheapest tier by 80% and the mid-tier by 20% while leaving its flagship untouched. The change is logged in the company's own API changelog and is already live on the published rate card. Per million input and output tokens, the standard rates now read: GPT-5.6 Luna: 20 cents and $1.20, down from $1 and $6GPT-5.6 Terra: $2 and $12, down from $2.50 and $15GPT-5.6 Sol: $5 and $30, unchanged, matching…