OpenAI Cuts GPT-5.6 API Prices: Luna Falls 80%, Terra 20%, Sol Holds

On July 30, 2026, OpenAI reduced the prices for its GPT-5.6 API tiers, with Luna seeing an 80% decrease to $0.20 per million input tokens and $1.20 per million output tokens, and Terra's prices falling by 20% to $2.00 and $12.00 respectively, while Sol's pricing remained unchanged. The price cuts result from optimizations across OpenAI's serving stack, such as improved hardware routing, better production inference software, and advanced context-caching algorithms. Notably, Sol's contributions to efficiency gains, through autonomously rewriting production code kernels, were significant enough to subsidize the reductions. The lowered prices make Luna particularly attractive for high-volume tasks like triage and classification, while preserving Sol for more complex reasoning tasks. The price changes highlight the importance of flexible architecture, such as using a provider-agnostic gateway, to adapt seamlessly to pricing volatility without extensive application code alterations.

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