OpenAI announced significant price cuts for its GPT-5.6 series on July 31, slashing the lightweight Luna model by 80% to 0.2 USD per million input tokens and 1.2 USD for output. The balanced Terra model was reduced by 20%, while flagship Sol remained unchanged. The move responds to persistent low-price strategies from Chinese models like DeepSeek V4, which have lured small developers. Post-cut, Luna now offers superior cost-effectiveness over DeepSeek V4 Pro according to Artificial Analysis.
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