OpenAI Cuts GPT-5.6 Luna Price 80%, Terra 20%, as Sol Stays Flat
OpenAI slashed API pricing for its cheaper GPT-5.6 tiers just three weeks after launch, citing serving-cost efficiency gains, while leaving the flagship Sol model untouched.
OpenAI cut prices on two of the three GPT-5.6 tiers on July 30, less than a month after the family launched, as competition from cheaper open-weight models squeezes margins across the API market.
- GPT-5.6 Luna: $1.00/$6.00 → $0.20/$1.20 per million input/output tokens, an 80% cut
- GPT-5.6 Terra: $2.50/$15.00 → $2.00/$12.00 per million tokens, a 20% cut
- GPT-5.6 Sol stays flat at $5.00/$30.00 per million tokens
- Cached input drops to $0.02 (Luna), $0.20 (Terra), $0.50 (Sol) per million tokens
OpenAI says the cuts follow inference work that cut end-to-end serving costs 20% and improved token-generation efficiency more than 15%. Terra's new output rate of $12/M now undercuts Anthropic's Claude Sonnet 4.6 at $15/M, while Luna competes directly with low-cost Chinese open-weight offerings on price. Compare tiers yourself in the arena.
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