GPT-6 Sol & Luna - Frontier AI intelligence, now at half the price
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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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GPT-6 Sol and Luna extend OpenAI's newest model family below Astra, trained the same way but tuned for speed and cost.
What makes it different: Sol beats Claude Opus 5 on Automation Bench at roughly 9% of the cost per task, and matches Claude Fable 5.1 on DeepSWE at about 80% lower cost. Both models also carry over Astra's alignment gains, including fewer misleading claims about their own coding work.
Key features:
50% lower API pricing than GPT-5.6 equivalents
Prompt caching improvements, 90% discount on cached input reads
Near-Astra factuality, coding, and computer-use performance
Who it's for: developers and teams running high-volume or long-running agent workflows who need frontier-level performance without frontier-level cost.
Try it via ChatGPT Work, Codex, or through the API
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