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OpenAI officially released the GPT-5.6 series on Thursday, launching three tiers of models: flagship Sol, mid-tier Terra, and budget Luna. CEO Sam Altman emphasized that Sol’s token usage efficiency on AI coding tasks improved 54% over its predecessor, with overall cost-effectiveness significantly optimized.
On the coding side, OpenAI cited the Artificial Analysis Coding Agent Index as evidence, claiming Sol scored 80 on that metric β 2.8 points higher than Anthropic’s Fable 5 β while using less