OpenAI Cuts GPT-5.6 Luna and Terra Prices, Adds Premium Fast Mode for Sol

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OpenAI has revised pricing for its GPT-5.6 model family, reducing Luna tier costs by 80% and Terra tier costs by 20%, while leaving the flagship Sol tier's standard rates unchanged. At launch, Sol was priced at $5 per million input tokens and $30 per million output tokens, with Terra and Luna offered at progressively lower rates. A new Fast mode has been introduced for Sol, offering up to 2.5 times faster processing speeds at twice the standard Sol price, positioning it as a premium performance option rather than a discount. The changes reinforce OpenAI's tiered strategy, making lower-cost tiers more economical for high-volume or routine workloads while preserving Sol for capability-intensive tasks. Developers are advised to evaluate model selection at the workload level and treat Sol Fast mode as a separate, premium cost category in budgeting and governance.

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