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.
We’ll perform a deep-dive analysis of all sources and publicly available external materials, then prepare a structured timeline of events, an in-depth report explaining the background and context, and multiple perspectives.