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GPT 5.1

GPT 5.1

By OpenAI
Model family: GPT
GPT-5.1 focuses on both capability and usability. Instant keeps chats fast but can decide when to think before answering, which improves math and coding results without losing speed. Thinking balances depth and latency by varying its internal reasoning time and uses plainer language for complex topics. New tone controls and stronger adherence to custom instructions make it easier to shape how ChatGPT responds. Rollout begins with paid users and expands shortly after, GPT-5.1 Auto routes queries to the best model, and the API adds gpt-5.1-chat-latest for Instant plus GPT-5.1 for Thinking. Over time GPT-5.1 becomes the default model.
New Multimodal Gen 3
Released: November 13, 2025

Overview

GPT-5.1 upgrades GPT-5 with two models, Instant and Thinking. Instant is warmer and more conversational, now with adaptive reasoning for harder prompts and better instruction following. Thinking adapts its thinking time per task and writes clearer, easier to understand answers. Rollout starts in ChatGPT, then API.

About OpenAI

OpenAI is a technology company that specializes in artificial intelligence research and innovation.

Industry: Artificial Intelligence
Company Size: 5000-5500
Location: San Francisco, California, US
Website: openai.com
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Last updated: February 12, 2026
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