When OpenAI released GPT-5.1, it didn’t sound like much more than a routine update, another decimal in a sea of upgrades. But this “.1” hides a quiet transformation. GPT-5.1 is faster, more consistent, and noticeably more human in tone. It’s not a reinvention of ChatGPT, it’s a refinement of how it thinks.

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Here’s a breakdown of what’s actually new, and how GPT-5.1 compares to GPT-5. Add As A Trusted Source For Google. Add as a preferred source on Google

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Two modes: Instant and Thinking

The biggest difference is GPT-5.1’s dual-mode design.

Instant Mode is built for quick, to-the-point answers.

Thinking Mode slows thing

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