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Comparison

OpenAI Codex vs Unreal Engine

	OpenAI Codex	Unreal Engine
What it says it does	OpenAI CodexOpenAI's coding agent. Codex works in a desktop app, on the web, in a CLI, in IDE extensions and on iOS, can run tasks in cloud sandboxes, and reviews GitHub pull requests.	Unreal EngineUnreal Engine is Epic Games' real-time 3D engine for building multi-platform games, with full source code access, Blueprints visual scripting and C++.
Pricing	OpenAI CodexIncluded with ChatGPT plans: Free $0 and Go $8/mo (desktop app, lighter model); Plus $20/mo (web, CLI, IDE, cloud code review); Pro $100, $200 or $500/mo; Business $25/user/mo billed monthly; or pay API rates with an API key (official)	Unreal EngineFree for game developers, individuals and small businesses (under $1M annual gross revenue) and educators, with full source access; games pay a 5% royalty only on lifetime gross product revenue above $1M (Epic Games Store revenue is royalty-exempt); non-game companies over $1M annual revenue need seats at $1,850 per seat per year (official)
Website	OpenAI Codexhttps://chatgpt.com/codex/	Unreal Enginehttps://www.unrealengine.com/

Which tool for which job

OpenAI Codex wins when you want one subscription that covers chat and a coding agent across terminal, IDE and cloud.

Unreal Engine wins when your game is 3D and visual fidelity matters more than a light editor.

Descriptions in the table come from each vendor's own site. This verdict is a fit call from those official pages as of 26 October 2026, not a shared benchmark or a hands-on score. Prices change, so confirm the pricing row on each tool page. How we review tools.

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