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OpenAI Codex

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The AI model that powers GitHub Copilot - Evolving into an Agent

Updated Nov 23, 2025
LLM / ModelPaidAPI
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About

OpenAI Codex was the original AI model capable of translating natural language to code, powering tools like GitHub Copilot. While the original standalone API was deprecated in 2023, the 'Codex' brand was revived in late 2025 as an autonomous software engineering agent. OpenAI continues to release specialized coding models under the Codex lineage, such as GPT-5.1-Codex, ensuring it remains at the forefront of AI code generation.

Key Features

  • ✓Natural language to code translation
  • ✓Powers GitHub Copilot
  • ✓Proficient in 12+ languages
  • ✓Revived as Codex Cloud Agent (Oct 2025)
  • ✓GPT-5.1-Codex architecture
  • ✓Autonomous coding capabilities

Use Cases

  • →Building custom AI coding assistants
  • →Automating code generation pipelines
  • →Natural language interfaces for applications
  • →Data analysis and visualization
  • →Refactoring legacy code

Technical Details

Languages

PythonJavaScriptGoPerlPHPRubySwiftTypeScriptSQLShell

AI Models

CodexGPT-5.1-CodexGPT-5.1-Codex-Max

Integrations

APIGitHub Copilot

Frequently Asked Questions

What is OpenAI Codex?

OpenAI Codex was the original AI model capable of translating natural language to code, powering tools like GitHub Copilot. While the original standalone API was deprecated in 2023, the 'Codex' brand was revived in late 2025 as an autonomous software engineering agent. OpenAI continues to release specialized coding models under the Codex lineage, such as GPT-5.1-Codex, ensuring it remains at the forefront of AI code generation.

How much does OpenAI Codex cost?

OpenAI Codex offers paid pricing. Plans include: API: Usage based.

What programming languages does OpenAI Codex support?

OpenAI Codex supports 10+ programming languages including Python, JavaScript, Go, Perl, PHP, Ruby, Swift, TypeScript, SQL, Shell.

What AI models does OpenAI Codex use?

OpenAI Codex is powered by Codex, GPT-5.1-Codex, GPT-5.1-Codex-Max.

What platforms does OpenAI Codex support?

OpenAI Codex is available on API.

What can OpenAI Codex do?

OpenAI Codex provides code completion, code generation, debugging, AI chat, agentic/autonomous mode. Key features include: Natural language to code translation, Powers GitHub Copilot, Proficient in 12+ languages.

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Comparison

GitHub Copilot vs Codeium: The Ultimate Free Alternative Comparison 2025

Detailed comparison of GitHub Copilot and Codeium in 2025. Compare free tiers, pricing, features, and find out which AI coding assistant offers the best value for developers.

2025-01-22•10 min read
→

Pricing

API

Usage based
  • •Access via OpenAI API
  • •GPT-5.1-Codex models

Company

Name
OpenAI
Founded
2015
Location
San Francisco, CA
Users
Millions via Copilot

Links

GitHub →Twitter →

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