ChatGPT

AI Assistants

Agentic AI

The world's most popular AI assistant powered by GPT-5.1 (Nov 12, 2025), featuring Instant and Thinking variants. GPT-5.1 Instant offers adaptive reasoning with warmer, more conversational responses. Includes 272K context, web search with 45% fewer factual errors, advanced voice mode, Canvas for iterative work, and custom GPTs.

Why Use ChatGPT

GPT-5.1 automatically adapts reasoning depth based on query complexity. Instant variant is warmer and more accurate than GPT-5. Thinking variant excels at complex problems while being faster on simple tasks. Built-in search reduces errors by 80% when reasoning. Massive ecosystem of custom GPTs for every use case.

Use Cases for Builders

Practical ways to use ChatGPT in your workflow

Draft product launch emails and landing page copy with Canvas
Research market data and competitor features with web search
Create custom GPTs for team workflows like standup summaries
Analyze customer feedback and extract insights from transcripts
Brainstorm product ideas with voice mode while commuting

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Advanced AI assistant powered by Claude Sonnet 4.5 with extended thinking mode, Artifacts for interactive content, and agentic computer use capabilities. Features 200K context window and built-in web search for accurate, sourced information.

Try ChatGPT

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