概要
ChatGPT is OpenAI flagship conversational AI, powered by the GPT-5 model family with GPT-5.6 Sol as the current paid flagship. Since its launch in November 2022, it has become the most widely used AI assistant in the world, serving over 200 million weekly active users across professionals, students, and developers. The platform excels at natural language understanding, code generation, creative writing, data analysis, and complex multi-step reasoning tasks. With multimodal capabilities including vision, voice, and file analysis, ChatGPT functions as a versatile all-in-one assistant. Key differentiators include the Custom GPTs marketplace for specialized AI agents, a plugin ecosystem for extended functionality, and the Code Interpreter for running Python code with file uploads. Pricing spans four tiers: a free tier with basic GPT-5 auto access, Go ($8/month) adding GPT-5.2 Instant for everyday users, Plus ($20/month) for higher limits and advanced models, and Pro ($100-200/month) offering maximum capacity for power users. Recent updates have introduced enhanced web browsing, persistent memory across conversations, and an improved voice mode for natural real-time dialogue. The SearchGPT integration brings live web results directly into conversations for up-to-date factual accuracy. For developers, the ChatGPT API with function calling enables building sophisticated AI-powered applications, while enterprise offerings include SSO, admin controls, and SOC 2 compliant data privacy guarantees.
主な機能
メリット
- +Most capable general-purpose AI
- +Massive knowledge base
- +Strong reasoning with o1
- +Excellent for coding and writing
デメリット
- -Usage limits on free tier
- -Can hallucinate confidently
- -Privacy concerns with data usage
- -Occasional slow response times
おすすめ用途
連携と互換性
Frequently Asked Questions
Is ChatGPT free to use?
ChatGPT offers a free tier with basic GPT-5 auto access. The Go plan at $8/month adds GPT-5.2 Instant with higher usage limits, and Plus at $20/month unlocks advanced models with even higher caps.
What is the difference between ChatGPT Plus and Pro?
Plus ($20/mo) provides higher limits and advanced model access. Pro ($100-200/mo across two tiers) offers maximum usage, priority access, and the GPT-5.6 Sol flagship for the hardest workloads.
Is ChatGPT better than Claude or Gemini?
ChatGPT leads in general versatility and plugin ecosystem. Claude excels at long-document analysis and coding, while Gemini integrates best with Google services.
Can ChatGPT generate images?
Yes, ChatGPT paid plans including Go, Plus, and Pro can generate images natively within conversations using the current GPT image models.
Is ChatGPT safe for private data?
OpenAI offers SOC 2 Type II compliance. Free tier data may be used for training, but Plus/Pro users can opt out in settings.
How to use ChatGPT for coding?
Paste your code or describe what you need. ChatGPT can write, debug, explain, and refactor code in most programming languages using the GPT-5 model family.
Does ChatGPT have a mobile app?
Yes, ChatGPT has official mobile apps for both iOS and Android, available for free download. The mobile apps support voice conversations, image uploads, and all features available on the web version. Paid subscribers get full model access on mobile, including the GPT-5 family flagship models, with sync across all devices.
Does ChatGPT have a voice mode?
Yes. Voice conversations are supported in the official iOS and Android apps and on the web, using the same GPT-5 model family as text chats. The current voice mode handles natural interruptions and real time back and forth, which makes it practical for hands free drafting, quick translations, and thinking through a problem out loud. Usage follows your plan limits, matching the caps that apply to text chats.
How many messages can I send on the free plan?
The free tier gives access to GPT-5 auto with daily message caps that reset on a rolling window. Heavy days can hit the limit quickly, especially on advanced models. The Go plan at $8 per month raises the caps for everyday use, and Plus at $20 per month adds substantially higher limits plus priority access at peak times.
Does ChatGPT offer a free trial for Plus?
OpenAI does not offer a time limited free trial for Plus. Instead, the free tier is permanently available with GPT-5 auto access, so you can test core features before paying. You can start Plus at $20 per month and cancel anytime from account settings, with access continuing until the end of the billing period.
Can ChatGPT browse the internet for current information?
Yes. The SearchGPT integration brings live web results directly into conversations, and the browser tool can open and read pages when a question needs fresh information. This keeps answers current on news, prices, and events, and responses cite the sources they used so you can verify claims.
Can I upload PDFs, spreadsheets, and other files to ChatGPT?
Yes. File upload works on Go, Plus, and Pro plans, and the Code Interpreter can run Python on uploaded CSV or Excel files to clean data, create charts, and produce summaries. Free users get limited file features. For regular data analysis work, Plus at $20 per month is the practical starting point.
What is the ChatGPT API and how is it priced?
The API is a separate developer product with per token pricing rather than a monthly subscription. It gives programmatic access to the GPT-5 model family with function calling for building applications. Consumer plans like Plus at $20 per month and the API are billed independently, so businesses typically use the API while individuals use the apps.
評価の内訳
対応言語
データプライバシーとセキュリティ
SOC 2 Type II