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Top-Tier Reasoning

GPT 5.3

GPT-5.3 Instant revolutionizes everyday conversations with smoother, more accurate responses, richer web-integrated insights, and up to 26.8% fewer hallucinations for direct, helpful interactions without unnecessary refusals or caveats. Experience the future of fluid AI assistance, now faster and more reliable than ever.

400k Context
Top-Tier Intelligence
Aug '25 Knowledge

Available for Chat, Vision, and File Uploads.

Performance Benchmarks

Humanity's Last Exam
39.9%
GPQA
87.3%
HumanEval
94.5%

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 5.3?

Reduced Hallucinations

The model delivers more factual responses with approximately 19.7-26.8% reduction in hallucinations across various domains

Intelligent Auto-Routing

An internal system automatically routes simple queries to fast response paths while complex problems engage extended reasoning tokens, optimizing cost and speed

Improved Web Synthesis

The model better balances web search results with its own knowledge, providing more relevant and contextualized answers without over-indexing on search results

Capability Examples

Multimodal Code Review
Analyze this screenshot of my app UI and suggest code improvements for better accessibility.
The UI shows low contrast text on a busy background; add ARIA labels and increase contrast ratio to 4.5:1 per WCAG. Here's updated React code: jsx <div role="button" aria-label="Close menu" tabIndex={0} style={{color: '#000', background: '#fff'}}>X</div> This fixes key issues while preserving design.
Direct Web Reasoning
What's the best way to handle a deer on a highway at night based on recent advice?
Drive straight ahead without swerving to maintain control; deer often scatter. Slow down gradually if possible, honk to scare it, and avoid sudden brakes on wet roads. Recent wildlife studies confirm this reduces collision risk by 40%.

How to use

1
Go to Chat

Navigate to the "AI Chat" page.

2
Select Model

Ensure GPT 5.3 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 5.3 better than Claude 3.5 or Gemini? Test same prompts simultaneously in the Chat Playground.

Open Chat Playground

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