OpenAI Launches ChatGPT 5.1: Smartly Generates Human-like Responses

OpenAI has decided to upgrade GPT‑5 to improve performance and conversation quality, and make ChatGPT customization easier. The new version is set to roll out on November 13 for paid users, granting access to two versions, namely GPT-5.1 Instant and GPT-5.1 Thinking. Free and logged-out users can expect to get access in the coming days.

What’s new in OpenAI ChatGPT 5.1? Let us tell you in detail. GPT-5.1 Instant is OpenAI’s most-used model. After the upgrade, it is warmer, more intelligent, and better equipped to follow the user’s instructions. On the other hand, as an advanced reasoning model, GPT-5.1 Thinking is now easier to understand, quicker on simple tasks, and more persistent on complex ones. 

OpenAI ChatGPT 5.1 Features 

GPT-5.1 in ChatGPT is rolling out to all users this week. It’s smarter, more reliable, and a lot more conversational.https://t.co/SA1Q1GPyxV — OpenAI (@OpenAI) November 12, 2025

According to OpenAI, users believed that great AI should not only be smart, but also enjoyable to talk to. Hence, GPT‑5.1 has been introduced to improve intelligence and communication style meaningfully. What’s the best part? ChatGPT will automatically choose the model best suited to respond to each query. Its chat style may also vary from person to person, depending on the type of conversation. The earlier GPT-5 models will remain accessible for three months under the legacy model menu before being phased out. Here are a few features of the upcoming model that you need to take note of: 

1. Users can choose from eight conversational styles, including Default, Professional, Friendly, Candid, Quirky, Efficient, Nerdy, and Cynical.
2. You can adjust the model’s tone to suit context and purpose.
3. GPT‑5.1 Instant uses adaptive reasoning to decide when to think before responding to more challenging questions.
4. Users yearning for more control can use ChatGPT’s manual tuning.
5. Both models give clearer, more user-friendly answers.
6. It uses less technical jargon and avoids vague or undefined terms.

Fidji Simo, OpenAI’s Applications CEO, stated in a Substack post that given the 800 million-plus ChatGPT users, personalization is essential. Furthermore, Simo highlighted the fact that a single conversational tone can no longer meet the diverse needs of the growing user base.