GPT‑5（正式には次世代ChatGPTとしてリリース予定）は、無料プランでも利用可能になる予定で、ユーザーはいわゆる標準的なインテリジェンス設定で無制限にチャット利用できるとOpenAI CEOのサム・アルトマン氏が公式に発表しています。 Plus や Pro の有料プランでは、さらに高度な知能レベルや追加機能にアクセスできるようになります note（ノート）+7note（ノート）+7MiraLab.inc+7。
🎯 どこで無料で使えるか？
- ChatGPT（OpenAI公式ウェブ版／アプリ）
無料アカウントでも GPT‑5（標準モード）を利用可能。乱用防止のための使用制限（例：１日の回数上限など）は設けられる可能性があるが、無制限チャットが基本です Reddit。 - Microsoft Copilot
Windows PCに統合された Copilot は GPT‑5 に対応する「Smart モード」を導入予定で、プラットフォームそのもので GPT‑5 を無料で利用できるようになると見られます（ただし、精度やレスポンスの仕様は流動的）note（ノート）+4note（ノート）+4accelc.co.jp+4。
📋 まとめ
| サービス | GPT‑5 利用状況（無料プラン） |
|---|---|
| ChatGPT（OpenAI公式） | ✅ 無料で標準インテリジェンス設定において無制限利用可能（ただし乱用対策あり） |
| Microsoft Copilot（Windows統合） | ✅ Smart モードで GPT‑5 を採用、無料での使用が期待される |
| その他のAIサービス | 現時点では GPT‑5 の対応情報は限定的 |
ℹ️ 注意点と補足
- GPT‑5 は現在、2025年8月ごろの正式リリースが予定されていますThe Verge。したがって、ChatGPT の無料版でも GPT‑5 を使い始めるのはリリース後になります。
- アルトマン氏は「地球上のすべての人へのGPT‑5の無料提供」を理想として語っていますが、これはまだ公式に実現しているわけではなく、長期的な構想です chatgpt5free.com+15note（ノート）+15shift-ai.co.jp+15。
- 無料プランでは乱用防止や公平性維持のために、トークン制限・アクセス制限などの利用制約が設けられる可能性があります。また、Plus／Pro プランでは優先アクセスや高度な機能が得られます MiraLab.inc+1note（ノート）+1。
✅ ご参考まで
- 使い始めるには？
OpenAI公式サイトまたはモバイルアプリから ChatGPT にサインアップ・ログインすれば、無料プランで GPT‑5（標準モード）が利用可能になります（リリース後）。 - Microsoft Copilot を使うなら？
Windows PC に標準搭載されている Copilot を通じて、GPT‑5 Smart モードで利用できるようになる予定です。
まとめると、GPT‑5 はリリース後に ChatGPT の無料プランで使えます（標準モードで無制限利用、ただし制限あり）。さらに、Microsoft Copilot ユーザーも同時に利用できる可能性があるとの見通しです。
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