GPT-6 Sol and GPT-6 Luna are available in the API
GPT-6 Sol and GPT-6 Luna are available in the API and are rolling out in Codex and ChatGPT Work for Plus, Pro, Business, and Enterprise users.
GPT-6 Sol and GPT-6 Luna are available in the API and are rolling out in Codex and ChatGPT Work for Plus, Pro, Business, and Enterprise users.
OpenAI Developers said on September 22, 2026, that both models were launching that day, with API prices 50% lower than GPT-5.6.
On September 22, 2026, Plus, Pro, Business, Enterprise, and Edu users get both models in ChatGPT Work and Codex, and both are available in the API. Free and Go users can try GPT-6 Luna in the desktop app.
OpenAI says both models show improvements over their GPT-5.6 counterparts.
OpenAI says GPT-6 Sol and GPT-6 Luna build on advances behind GPT-6 Astra as faster, more affordable models for work at scale. More efficient caching and inference are reflected in API prices 50% lower than GPT-5.6 promotional pricing.
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