OpenAI launched GPT-5.1 for ChatGPT, introducing Instant and Thinking models that improve speed, reasoning, and personalization. The update allows users to control tone and personality, offering options for communication style and emoji use. GPT-5.1 addresses prior issues by reducing jargon and maintaining access to older models for comparison. The update is available to Pro, Plus, Go, Business, free, enterprise, and education users, with enterprise and education plans receiving early access. OpenAI plans clearer communication and longer transition periods for future model updates.

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