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OpenAI launches new flagship model GPT-5.6 Sol with midrange pricing, top-tier performance

OpenAI has released its new flagship AI model, GPT-5.6 Sol, to the public and revamped its naming system to Sol, Terra and Luna based on performance tiers. Sol is priced at $5 per 1 million input tokens and $30 per 1 million output tokens, while Luna costs $1 and $6. OpenAI also disclosed benchmark scores and highlighted cybersecurity results, alongside mostly positive early user feedback.