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Make AI Games

OpenAI Codex

OpenAI's coding agent.

Coding & engine AI
From $8/mo
starting price
Visit OpenAI Codex

Overview

OpenAI Codex: OpenAI's coding agent. It scores 68/100 in our coding & engine tools ranking. Best for: ChatGPT subscribers who want a coding agent.

Codex is OpenAI's coding agent, available in the cloud, a command-line tool and IDEs, included with ChatGPT plans.

Pros

  • Limited free tier
  • Commercial use allowed
  • MCP support
  • Runs or playtests the game
  • Choose the AI model
  • Local or offline models

Cons

  • Needs technical skills

OpenAI Codex pricing

Free
Free

Limited trial access to Codex

PlusCheapest paid
$20/mo

Codex web, CLI, IDE; cloud code review and Slack

Pro
$100/mo

From $100/mo; 5x or 20x Plus usage limits

Business
Custom

Pay-as-you-go; standard or usage-based Codex seats

Monthly prices in USD as listed by OpenAI Codex. Last checked 2026-10-21.

Features

  • Works inside the game engine Not confirmed
  • MCP support Yes
  • Edits scenes and assets, not just code Not confirmed
  • Runs or playtests the game Tests browser games in a live browser using its Playwright skill Yes
  • Choose the AI model model / model_provider keys in config.toml; -m flag Yes
  • Local or offline models --oss mode runs local models (e.g. gpt-oss via Ollama or LM Studio) Yes

Checked against OpenAI Codex's own site, docs and pricing page. How we check

Score breakdown: 68/100

  • Accessibility 13%
    71
  • Output & integration 21%
    44
  • Commercial rights 13%
    100
  • Value 9%
    60
  • Maturity 13%
    100
  • Game focus 17%
    40
  • Features 15%
    80

Based on price, free plan, commercial rights, exports and features. How we score

#17 AI Coding Tools for Game Development

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Compare with MCP for Unity and Summer Engine

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