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Top-Tier Reasoning

GPT 5.2 Codex

GPT-5.2 Codex is OpenAI's groundbreaking AI agent optimized for autonomous software engineering, mastering complex codebases, refactors, debugging, and security reviews with record-breaking SWE-Bench Pro scores. Unlock unprecedented developer productivity by powering through multi-day tasks with native context compaction and multimodal reasoning for shippable, high-quality code.

400k Context
Top-Tier Intelligence
Aug '25 Knowledge

Available for Chat, Vision, and File Uploads.

Performance Benchmarks

MMLU Pro
87.4%
GPQA
50.3%
HumanEval
N/A

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 5.2 Codex?

Context Compaction

Automatically summarizes session history to enable multi-hour coding sessions without losing coherence across 400K token limit

Cybersecurity Analysis

Achieves 87% on CVE-Bench for identifying and patching vulnerabilities in code

Reliable Tool Calling

98.7% accuracy on Tau2-bench for dependable agentic workflows with external tools and APIs

Capability Examples

How to use

1
Go to Chat

Navigate to the "AI Chat" page.

2
Select Model

Ensure GPT 5.2 Codex 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 5.2 Codex better than Claude 3.5 or Gemini? Test same prompts simultaneously in the Chat Playground.

Open Chat Playground

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