GPT-5.1 comes with some pretty interesting improvements over GPT-5.
The tone seems warmer and more natural -- the conversation experience gets even better.
People were complaining about GPT-5 being too robotic compared to earlier models like 4o -- so now 5.1 is here to fix that with a more emotionally intelligent model that combines the best of all worlds.
Although I know some of you never saw this as an issue -- you'd rather have a cold no-nonsense assistant than a bubbly pretentious friend, am I right?
They've also made serious upgrades to the adaptive reasoning feature GPT-5 introduced.
Adaptive reasoning would sometimes overthinking simple questions or underthink complex ones
But GPT-5.1 now adjusts its “mental effort” based on what you ask. Quick things stay quick. Deep things get deeper.
No more long pauses for simple questions
Fewer shallow, rushed answers
Way less repetition
A smoother feeling of flow when you chat
Two modes: Instant vs Thinking
GPT-5.1 comes with two personalities baked into it:
Instant — lightning-fast replies, lighter reasoning
Thinking — slower but thoughtful, for complex coding, planning, strategy, and anything complex
Better personality choices
The personal presets they introduced earlier this year has also gotten upgrades.
You can make ChatGPT sound:
more warm
more direct
more energetic
more calm
more playful
more concise
The tone doesn’t just change — the whole feel changes. You can choose how you want AI to show up in your life.
You can use ChatGPT for therapy-like reflections, motivation, creativity, or journaling -- the voice will match the vibe.
GPT-5.1 holds onto the thread of your conversation incredibly well.
If you’re planning…
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