After a controversial release earlier in the year, OpenAI has released a new update to ChatGPT to address some of the concerns. It’s called GPT-5.1 and is now live for all users currently utilising GPT-5.0. This upgrade introduces two variants, which include GPT-5.1 Instant and GPT-5.1 Thinking. Both are designed to deliver smarter, more engaging interactions, with both of them focusing on personalisation.
OpenAI CEO Sam Altman highlighted the update in a company blog post, stating that the GPT-5.1 models are “not only smarter but also enjoyable to talk to.” Built on more advanced training techniques, these models address common concerns in AI interactions, some of which include overly robotic responses and excessive jargons.
Here’s a quick summary of what the new GPT-5.1 models bring to the table.
GPT-5.1 Instant: Faster, funnier, and more responsive
At the heart of the ChatGPT update is GPT-5.1 Instant, which is OpenAI’s flagship model for everyday use. Described as “warmer” and conversational, it offers a touch of playfulness into responses without sacrificing clarity or utility. Early testers have been surprised by its witty flair, making it ideal for brainstorming ideas, quick queries, or casual chats. Some key improvements in GPT-5.1 Instant include:
Enhanced responsiveness: The model adheres more closely to user instructions, ensuring smoother conversational flow.
Smart decision-making: It automatically determines when to “think before responding” on complex questions, balancing speed with accuracy.
User-friendly design: Optimised for broad accessibility, this model powers the majority of ChatGPT sessions, making AI feel less like a tool and more like a companion.
For businesses and creators relying on ChatGPT for content generation or customer support, these tweaks could streamline workflows and elevate engagement.
GPT-5.1 Thinking: Precision reasoning for complex tasks
The GPT-5.1 Thinking model is tailored for in-depth analysis and problem-solving. This model excels in deeper reasoning, dynamically allocating “thinking time” based on query complexity—lingering on tough puzzles while zipping through simple ones. Notable upgrades to this model include:
Clearer communication: Responses are jargon-free and concise, with fewer undefined terms, perfect for explaining technical concepts or tackling work-related challenges.
Efficiency boost: It handles tasks like data interpretation or strategic planning with greater precision, reducing errors in high-stakes scenarios.
Professionals in tech, education, and research will find GPT-5.1 Thinking more useful for its ability to simplify complex topics.
Who will get GPT-5.1 benefits?
The ChatGPT GPT-5.1 update begins deploying from November 13, 2025, prioritising paid tiers like Pro, Plus, Go, and Business users. Free and logged-out accounts will follow in the coming days. Enterprise and Education plan holders enjoy a seven-day early-access window via a toggle, before it becomes the default model.
OpenAI also teased an upgrade for the premium GPT-5 Pro to GPT-5.1 Pro.
ChatGPT customisation options
With GPT-5.1, OpenAI introduces robust tone and style customisation to ChatGPT. Users can select from eight presets: Default, Friendly (evolved from Listener), Efficient (formerly Robot), Professional, Candid, Quirky, Cynical (updated from Cynic), and Nerdy (refined from Nerd).
For those seeking granular control, an experimental fine-tuning feature launches this week for select users. Adjust sliders for conciseness, warmth, scannability, and emoji frequency are present to craft a bespoke AI voice.
