OpenAI improves GPT-5.6 Sol in ChatGPT, expands free access to Luna
OpenAI says the improved GPT-5.6 Sol in ChatGPT produced 68% fewer factual errors than GPT-5.5 Instant in finance, medicine, and law evals, now powering Instant and deep reasoning for Plus and Pro users. Free and Go users get unlimited text chats with GPT-5.6 Luna starting tomorrow, while Codex and ChatGPT Work retain the previous version.
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