OpenAI has officially launched its highly anticipated OpenAI GPT-5.1 update, bringing two improved models — GPT-5.1 Instant and GPT-5.1 Thinking — to ChatGPT. The company says the new models are not just “smarter” but also more enjoyable and natural to talk to.

A More Personal ChatGPT Experience

One of the biggest changes in the OpenAI GPT-5.1 update is the ability for users to fine-tune ChatGPT’s tone and style. You can now choose how you want the AI to sound — friendly, professional, quirky, nerdy, and more — making conversations feel more aligned with your goals and personality.

What’s New in GPT-5.1 Instant?

GPT-5.1 Instant is the faster, more conversational option in the OpenAI GPT-5.1 update. OpenAI describes it as “warmer by default,” with a playful tone that still remains accurate and helpful.

It’s been trained to respond more directly to instructions and to decide intelligently when it should pause to “think” before answering difficult questions. The goal is simple: fast replies with better accuracy.

What’s New in GPT-5.1 Thinking?

GPT-5.1 Thinking is designed for deeper reasoning and problem-solving. In the OpenAI GPT-5.1 update, this model allocates more processing time to harder questions while keeping simple answers quick.

It also produces clearer, more structured responses with fewer undefined terms — making it ideal for technical explanations, research, and complex workplace tasks.

When Can Users Access GPT-5.1?

The OpenAI GPT-5.1 update begins rolling out today (Nov 13) for paid users across Pro, Plus, Go, and Business plans. Free users and logged-out visitors will get access over the next few days. Enterprise and Edu customers receive a seven-day early toggle before GPT-5.1 becomes the default.

OpenAI also confirmed that GPT-5 Pro will soon be upgraded to GPT-5.1 Pro.

New Tone and Style Controls in ChatGPT

Alongside the OpenAI GPT-5.1 update, ChatGPT now includes eight tone presets:

• Default
• Friendly (formerly Listener)
• Efficient (formerly Robot)
• Professional
• Candid
• Quirky
• Cynical
• Nerdy

OpenAI is also testing deeper customization options that let users adjust warmth, conciseness, clarity, and even emoji usage. These advanced controls will roll out to a small group of testers later this week.

Bottom Line

The OpenAI GPT-5.1 update marks one of the biggest ChatGPT upgrades so far — combining speed, stronger reasoning, and new ways to make the AI feel more personal. With Instant and Thinking models now rolling out globally, ChatGPT is stepping closer to becoming a more adaptable digital assistant for work, creativity, and everyday use.