OpenAI Splits GPT-6 Into Sol and Luna, Doubling Down on Cost-Tiered Variants

OpenAI released two GPT-6 models the same week as Anthropic's Opus 5.5, betting that the next competition is about the right model for the job, not the biggest one.

OpenAI released GPT-6 Sol and GPT-6 Luna, and the naming tells the strategy. As @ozansihay reported, "OpenAI released GPT-6 Sol and Luna; Anthropic released Claude Opus 5.5" — three frontier drops from two labs inside a single window. Sol is positioned as the faster, cheaper workhorse, while Luna is the lighter variant, extending OpenAI's move toward a family of task-tiered models rather than a single flagship.

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