The Daily AI · September 23, 2026

OpenAI and Anthropic Spark 'Efficiency War' with GPT-6 Sol and Opus 5.5

OpenAI and Anthropic launched mid-tier frontier models just hours apart, signaling a pivot from raw scaling to intelligence-per-dollar. OpenAI's GPT-6 Sol and Luna models reduce API costs by 50% compared to the 5.6 series, while Anthropic’s Claude Opus 5.5 offers 40% lower operational costs while matching the performance of its flagship Fable 5.1.

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