OpenAI launches cheaper GPT-6 Sol and Luna AI models for businesses and developers

On September 22, 2026, OpenAI, the American AI company, launched two new AI models, GPT-6 Sol and GPT-6 Luna, designed to offer many capabilities of its flagship GPT-6 Astra at a lower cost. The models are priced at half the promotional rates of their predecessors, with Sol at $2 per million input tokens and Luna at $0.10. They are aimed at professional work, coding, and automation. OpenAI achieved cost reductions through improved inference and caching. The launch follows the earlier release of GPT-6 Astra, which has faced scrutiny over AI agent behavior.