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Very High Reasoning

GPT 5.1

GPT-5.1 revolutionizes AI with dual Instant and Thinking modes, delivering lightning-fast responses for everyday tasks and deep adaptive reasoning for complex challenges. Experience smarter, warmer conversations, superior instruction following, and cost-saving efficiencies that supercharge enterprise automation and creativity.

128k Context
Very High Intelligence
Sep '24 Knowledge

Available for Chat, Vision, and File Uploads.

Performance Benchmarks

MMLU
91.38%
GSM8K
98%
MMLU Pro
86.38%

How do you want to interact?

Start a Conversation

Ask anything.
Have a natural conversation, brainstorm ideas, draft emails, or ask for advice.

Start Chatting

Use a Persona

Specialized Experts.
Instruct the AI to act as a Coding Tutor, Marketing Expert, or Travel Guide.

Pick a Persona

Why use GPT 5.1?

Dual Operating Modes

Instant mode for speed and low latency on simple tasks; Thinking mode for deeper reasoning on complex workflows

Adaptive Reasoning

Dynamically adjusts computational effort and thinking time based on task complexity for efficient, context-aware responses

Multimodal Intelligence

Supports text, image, and audio inputs/outputs for versatile processing including file analysis and coding

Capability Examples

Quick Email Drafting with Instant Mode
Draft a professional email inviting my team to a meeting on project updates next Tuesday at 2 PM.
Subject: Team Meeting - Project Updates
Best, [Your Name]
fas fa-envelope
Code Debugging with Thinking Mode
Debug this Python code that's failing on large inputs: def sum_list(lst): return sum(lst) for i in range(1000000): lst.append(i)
The issue is that sum(lst) processes the entire list repeatedly in the loop, causing quadratic time and memory overflow on large inputs. Here's the fixed version using running total:
This runs in linear time O(n).
fas fa-bug

How to use

1
Go to Chat

Navigate to the "AI Chat" page.

2
Select Model

Ensure GPT 5.1 is selected.

3
Type Prompt

Ask a question or paste code.

4
Interact

Refine the answer by replying to the AI.

Compare LLMs Side-by-Side

Is GPT 5.1 better than Claude 3.5 or Gemini? Test same prompts simultaneously in the Chat Playground.

Open Chat Playground

Made with ❤ by AI4Chat