OpenAI has officially unveiled GPT-5.1, the latest evolution of its flagship AI model, featuring two advanced variants—GPT-5.1 Instant and GPT-5.1 Thinking. This major update focuses on delivering more natural, engaging conversations while dramatically improving reasoning and task performance. The release comes just three months after the debut of GPT-5, which drew criticism from users for feeling “cold” and inconsistent compared to previous versions.

GPT-5.1 Instant now powers most ChatGPT conversations, offering faster, more lifelike dialogue, while GPT-5.1 Thinking handles deeper and more complex reasoning tasks. Both models can dynamically assess question difficulty, spending extra processing time on challenging problems and giving quicker responses to simpler ones—making conversation

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