OpenAI has announced price cuts across its GPT-5.6 model family, alongside a new Fast mode for its top-tier Sol model in the API.

From yesterday, GPT-5.6 Luna, described as the company's fastest and most affordable model, will cost 80% less, while Terra, its balanced everyday model, will cost 20% less. New API pricing sets Terra at $2 per million input tokens and $12 per million output tokens, and Luna at $0.20 per million input tokens and $1.20 per million output tokens. Sol's pricing is unchanged.

OpenAI said the changes reflect broader efficiency gains across its models, inference systems and agentic tooling, citing internal use of Sol to autonomously rewrite production kernels and run optimisation experiments, cutting model-serving costs by 20% and improving token-generation efficiency by more than 15%.

Fast mode for Sol replaces the previous Priority Processing offering, delivering up to 2.5 times the speed of standard processing at twice the price, with existing priority-tagged requests continuing to work automatically.

Terra and Luna remain available across ChatGPT Work, Codex and the OpenAI API, with subscription prices and quota budgets unchanged.

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