Source: https://bestagentsfor.com/ja/agents/openai-codex/
Markdown: https://bestagentsfor.com/ja/agents/openai-codex/index.md

Title: OpenAI Codexの料金・機能・代替（2026） | Best Agents For

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確認日 5 October 2026

# OpenAI Codexの料金・機能・代替（2026）

OpenAI Codexの開始価格は From $20 です。下の製品メモは、ベンダーが公開している料金のまま記しています。

Build anything with Codex.

## 概要

OpenAI describes Codex as a coding partner included in ChatGPT that takes on bugs, refactors, and new features, and runs many agents in parallel with computer and browser tools. The same agent is available in ChatGPT, an IDE extension, the terminal, and cloud environments that keep tasks running after the laptop is closed.

openai.com/codex/

## 料金

https://openai.com/codex/ lists Plus at $20, Pro at $100, and Business at $20, and says Codex is included in the ChatGPT plan. The Business note on that page says for 2+ seats, billed annually. Last checked 5 October 2026.

## デモ動画

Introducing the Codex app · OpenAI

## 機能

- Sold to run the job rather than wait for a prompt on every step. Keep a way to stop it before it reaches a customer, a candidate, or a filing.

- Integrations: ChatGPT, IDE extension, Terminal, Cloud environments, Plugins.

- Not sold as one named foundation model on the pages we opened.

自律度: Autonomous. チーム規模: Solo, Small team, Mid-market.

## 強み

- Published starting price: From $20.

- Connects to ChatGPT, IDE extension, Terminal, Cloud environments.

- Teams already on ChatGPT who want parallel coding agents and pull-request review

## 限界

- No free tier and no trial listed.

- Sold to operate the motion. Plan on supervising the first sends.

## 向いている人

Teams already on ChatGPT who want parallel coding agents and pull-request review

## 代替

同じカテゴリに並ぶほかの製品です。

- Augment CodeFrom $20/mo

- Claude CodeFrom $17/mo

- ClineFree

- CursorFrom $20/mo

- DevinFree, then $20/mo

OpenAI Codexの主な代替

## 出典

- Product

## どの一覧に入るか

- おすすめのAIコーディングエージェント#5 of 10