OpenAI introduced GPT-6 Sol and GPT-6 Luna on September 22, 2026, extending the GPT-6 family beyond Astra with two lower-cost models aimed at everyday professional, coding and agentic work. The company says the models bring capabilities from GPT-6 Astra into faster, cheaper tiers, while cutting API prices for Sol and Luna by 50% from GPT-5.6 promotional levels.
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