OpenAI Cuts GPT-5.6 Luna Costs by 80%, Terra by 20%, Adds Faster Sol Tier

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OpenAI has selectively reduced pricing for two variants of its GPT-5.6 model family, slashing Luna costs by approximately 80% and Terra costs by around 20%. The changes affect both API usage and credit consumption within ChatGPT Work and Codex platforms. Alongside the price cuts, OpenAI introduced a Sol Fast mode capable of processing tasks up to 2.5 times quicker, though at roughly double the standard Sol price, which itself remains unchanged. The adjustments are targeted rather than a blanket reduction, meaning organizations cannot assume all GPT-5.6 workloads will automatically become cheaper. Developers and enterprise teams are advised to review their model-routing strategies and usage forecasts to determine where Luna or Terra can replace costlier options without sacrificing output quality.

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