OpenAI cuts Luna 80%, Terra 20%, and adds Fast mode to Sol in the API
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- x.com
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major price cuts today: *80% drop for GPT-5.6 Luna, now $0.20 per million input tokens and $1.20 per million output *20% drop for GPT-5.6 Terra, to $2/$12 *GPT-5.6 Sol gets Fast mode in the API, up to 2.5x the speed for 2x the price, same intelligence
we want to offer the best price/intelligence tradeoff at every level
Context
OpenAI's July 30, 2026 pricing update offered two different tradeoffs. Luna's API prices fell 80%, to $0.20 per million input and $1.20 per million output tokens. Terra's fell 20%, to $2 and $12 respectively.
Sol instead gained Fast mode in the API: the company claimed up to 2.5 times the speed of Standard processing for twice the price, with unchanged intelligence. Developers could therefore pay less for Luna or Terra usage, or pay a premium to reduce waiting with Sol.
- token — The chunk of text a model reads and writes in — roughly three-quarters of a word — and the unit AI usage is billed in.
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