OpenAI launched GPT-6Sol and GPT-6Luna, small models matching GPT-6Astra's performance in coding, reasoning, and factual accuracy at half the cost. API prices are down 50% from GPT-5.6, with optimized prompt caching boosting efficiency. Sol outperforms Claude Opus5 in automation and agent tasks while cutting costs by up to 60%. Luna rivals flagship models at one-tenth the price. Both feature Astra's improved communication style and are available in ChatGPT Work, Codex, and the API for all user tiers including Plus, Pro, Business, Enterprise, and Edu.
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