Perplexity CEO Aravind Srinivas introduces GPT 5.1 for Pro and Max users: All you need to know

Perplexity Chief Aravind Srinivas confirmed on Friday that the company will integrate OpenAI’s latest model, GPT-5.1, across its platform. His announcement comes after OpenAI recently unveiled the new system, which is claimed to promise more natural conversations, clearer reasoning, and improved personalisation.

Srinivas welcomes the new model

Srinivas tweeted, “GPT 5.1 on Perplexity for all Pro and Max users. Kimi K2 is coming very soon.”

What GPT-5.1 brings

GPT-5.1, revealed by OpenAI earlier this week, introduces upgrades in intelligence, adaptability, and communication style. It is available in two forms. GPT-5.1 Instant focuses on speed and accessibility, while GPT-5.1 Thinking is designed for deeper reasoning and more persistent problem-solving.

OpenAI said the new model is intended to produce clearer outputs with fewer vague terms, offering a smoother and more approachable dialogue experience.

It has two variants, the GPT-5.1 Instant, ChatGPT’s most used model, that is now warmer by default, more conversational, and better at following instructions; and GPT-5.1 Thinking, the advanced reasoning model, that the company promises is easier to understand, faster on simple tasks, and more persistent on complex ones.

OpenAI said the new release comes in two forms. The first, GPT-5.1 Instant, is the model most frequently used in ChatGPT and now aims to sound warmer, more conversational, and more reliable when following user instructions. The second, GPT-5.1 Thinking, is designed for advanced reasoning and is intended to be easier to interpret, quicker with basic tasks, and more consistent during lengthy or complex problem-solving.

The company added that GPT-5.1 Thinking produces explanations that are clearer and uses fewer vague or undefined terms.

OpenAI Co-Founder Sam Altman confirmed the launch in a post on X, calling it a “nice upgrade”. He said he is particularly impressed by the improvements in instruction handling and the model’s adaptive thinking abilities.

Altman noted that the broader refinements to intelligence and communication style also stand out in the latest version.

He added that users now have more flexibility when shaping how ChatGPT responds, with a choice of presets that include default, friendly, efficient, professional, candid, or quirky, along with options to fine-tune the tone further.