GPT-6 Sol & Luna

In plain words

GPT-6 Sol & Luna are faster, cheaper AI models from OpenAI trained using methods similar to their Astra model. They offer 50% lower API pricing than previous versions, with comparable performance in factuality, coding, and computer use capabilities. The models feature improved prompt caching that reduces cached read costs by 90% and include alignment improvements. They are available through ChatGPT Work, Codex, and via API for developers and organizations.

written from the facts on this page · September 2026

From the sources

OpenAI expands the GPT-6 family with Sol and Luna with faster, cheaper models trained like Astra. 50% lower API pricing, near-Astra factuality/coding/computer use gains, better prompt caching (90% off cached reads), and alignment improvements. Live in ChatGPT Work, Codex, and via API.

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