OpenAI
APIs and tools for building AI products
5.0•856 reviews•28K followers
APIs and tools for building AI products
5.0•856 reviews•28K followers
The most powerful platform for building AI products.
Build and scale AI experiences powered by industry-leading models and tools.
This is the 51st launch from OpenAI. View more
GPT-6 Sol & Luna
Launching today
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.
Payment Required
Launch Team
Gemini 2.5 Pro
Claude Code
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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Couch
Does the prompt caching for Sol and Luna work the same way as it does for Astra?