OpenAI has rolled out GPT-5.1, introducing two upgraded models — GPT-5.1 Instant and GPT-5.1 Thinking — designed to make conversations smarter, warmer, and more natural. The update is gradually becoming available to paid users, bringing noticeable improvements in how ChatGPT understands and responds.
So, what’s new? GPT-5.1 is now more conversational and follows instructions with far better accuracy. It handles complex questions using adaptive reasoning, helping it perform stronger on benchmarks like AIME 2025 and Codeforces. The enhanced Thinking model has also become faster and clearer, adjusting its reasoning time based on the difficulty of the task. Across the board, responses now feel more human — less jargon, more empathy.
For brands, this upgrade unlocks stronger personalization tools. ChatGPT now offers improved control over tone, including Professional, Candid, and Quirky modes, on top of existing styles like Friendly and Efficient. Brands building chatbots or content workflows can fine-tune these tones to stay consistent with their identity and create more relatable customer interactions.
OpenAI is also testing new features that let users adjust warmth or emoji frequency, giving even more creative flexibility. Plus, any personalization changes — tone, style, or custom instructions — now update instantly across all chats. With GPT-5.1 coming to the API soon, brands can expect smoother conversations, smarter automation, and content that feels more authentically “them.”
