ChatGPT

What It Is

ChatGPT is an AI conversational tool developed by OpenAI, with its underlying model evolving from the initial GPT-3.5 to the current GPT-4o and GPT-4o mini. OpenAI is one of the most influential research institutions in the AI field, backed by significant investment from Microsoft, which is why ChatGPT has been able to maintain its position at the technological forefront.

As of 2025, ChatGPT’s global monthly active users exceed 300 million, making it the AI assistant product with the largest user base currently. Its core capabilities cover conversational Q&A, writing, coding, data analysis, image generation (integrated with DALL-E), and web search, making it arguably the most comprehensive general-purpose AI tool available today.

Clarifying the Core Features

Conversations and Q&A

This is the most fundamental feature and the one most people use. You can ask it anything in natural language—technical concepts, historical events, cooking recipes, parenting advice, workplace dilemmas—and it will provide structured answers.

ChatGPT’s advantage lies in its ability to maintain context across multiple turns of conversation. This means you can follow up, correct, or add information, and it will remember what was said earlier in the dialogue. It feels more like a continuous conversational assistant than just a search engine.

However, keep in mind that its training data has a cutoff date. For real-time events occurring after that cutoff, it won’t know unless you enable web-browsing mode.

Writing Assistance

This is one of the most common use cases for ChatGPT in the workplace. It can help you write:

• Various business emails (client replies, apology letters, proposals)
• Reports and documents (weekly/monthly reports, project summaries)
• Social media content (Xiaohongshu, WeChat Official Accounts, LinkedIn)
• Creative writing (story outlines, scripts, ad copy)
• Translation and polishing (Chinese-English translation, making dry text more fluent)

The key is: the more context you provide, the better the output. Don’t just say “help me write an email”; instead, tell it who the recipient is, what the background is, what you want to convey, and what tone you’re aiming for. The difference can be huge.

Code Generation and Debugging

Many developers have already integrated ChatGPT into their daily workflows. It can:

• Generate code snippets or complete functions based on your description
• Help identify bugs and explain their causes
• Explain code you don’t understand
• Convert code from one language to another
• Write unit tests
• Add comments and documentation to existing code

GPT-4o’s coding capabilities rank among the top across multiple evaluation benchmarks, especially for commonly used languages like Python, JavaScript, and TypeScript. However, for complex large-scale projects, its understanding is limited by context length, making it less convenient than purpose-built tools like Cursor when handling multi-file collaborative tasks.

Data Analysis

The paid version (ChatGPT Plus) includes the "Code Interpreter" feature, which allows you to upload Excel spreadsheets or CSV files directly and ask questions in natural language: “Help me calculate sales by region,” “Create a line chart to visualize trends over the past six months,” or “Identify rows with missing values.” It will automatically run Python code to provide the results.

This is a highly practical feature for those who need to process data but lack programming skills, saving you the cost of learning Excel functions or hiring a data analyst.

Image Generation

ChatGPT integrates OpenAI’s DALL-E 3, allowing you to generate images directly within the conversation by simply saying, “Help me create an image of…” DALL-E 3 is particularly strong at understanding Chinese descriptions and generating images containing text—a task that has historically been challenging for AI image generators, though DALL-E 3 handles it relatively well.

However, if you have high standards for artistic quality, Midjourney, a dedicated image-generation tool, generally produces more aesthetically pleasing results with stronger stylization. DALL-E 3’s advantage lies in its convenience: images are generated directly within the chat, eliminating the need to switch between tools.

Web Browsing

ChatGPT can enable web browsing mode to search the internet in real time and summarize the results for you. This addresses the limitation of its training data cutoff, allowing it to answer questions like "What are today's news headlines?" or "What is the latest price of Product X?"

However, the quality and speed of this feature do not match those of Perplexity AI, which specializes in this task. Perplexity offers a smoother experience for "search and summarize" scenarios, with clearer source citations.

Multimodal Capabilities of GPT-4o

GPT-4o (where "o" stands for omni, meaning all-encompassing) is currently the flagship model. It supports:

• Image Analysis: Upload a screenshot, photo, or chart for it to analyze, explain, or answer questions about.
• Voice Conversation: Engage in real-time voice conversations with the AI, with latency low enough to feel like a natural dialogue.
• Video Understanding: Upload video clips for content analysis (some features are still being rolled out).

GPTs: Pre-built AI Apps by Others

ChatGPT Plus users have access to GPTs—a feature akin to an "app store" provided by OpenAI, hosting a vast array of specialized assistants customized for ChatGPT by third-party developers. Examples include bots dedicated to writing resumes, translating academic papers, performing SEO analysis, or role-playing specific personas.

You can also create your own GPTs by defining specific roles, knowledge bases, and behavioral rules. This allows you to craft a personalized AI assistant tailored to your needs or build internal tools for your team.

Who Should Use It

Professionals, especially those in writing-heavy roles: Drafting articles, editing content, preparing presentations, and managing emails—these are just a few of the daily tasks where ChatGPT can genuinely save you 30% to 50% of your time. No exaggeration here.

Developers and tech professionals: Writing code, debugging, searching documentation, and explaining technical concepts have already become integral parts of many developers' daily toolchains.

Students and learners: It can explain concepts, help you grasp complex topics, offer suggestions for papers, and aid in exam preparation. However, be careful not to submit its output directly as your own work; treat it as a tutor, not a ghostwriter.

Entrepreneurs and product managers: It is highly practical for competitive analysis, writing product documentation, and brainstorming sessions.

Differences Between Free and Paid Tiers

Free Tier:

• Access to GPT-4o mini (a smaller model that is faster but slightly less capable)
• Usage limits apply
• Limited web search capability

ChatGPT Plus ($20/month):

• Full access to GPT-4o
• Higher usage frequency caps
• Code Interpreter (data analysis feature)
• Image generation (DALL-E 3)
• Full web search capability
• Access to the GPTs App Store

ChatGPT Pro ($200/month):

• Designed for power users with nearly unlimited usage
• Priority access to the latest models
• Ideal for professional users who rely on ChatGPT as a core production tool

For most casual users, trying the free tier is sufficient. If you find yourself using it regularly, the $20 monthly fee for Plus is worth it. However, if you only ask questions occasionally, the free tier is more than enough.

Notes for Users in Mainland China

Accessing ChatGPT requires a VPN, which is an unavoidable reality. Additionally, ChatGPT does not support registration with Mainland Chinese phone numbers; you must use a foreign phone number or rely on third-party verification services.

If these hurdles are too cumbersome for you, consider domestic alternatives such as DeepSeek, Kimi, ERNIE Bot (Wenxin Yiyan), and Tongyi Qianwen. These do not require a VPN, offer strong Chinese language capabilities, and may even outperform ChatGPT in certain areas (such as DeepSeek’s reasoning abilities). However, if you have the means to use ChatGPT, it remains the most comprehensive choice in terms of overall capability and ecosystem completeness.

Practical Tips for Use

Assign a role to the AI: Starting with prompts like "You are a marketing expert with 10 years of experience, help me..." significantly improves the professionalism of the output.

Guide the style with examples: Paste an article you consider well-written and add, "Write this in this style for me." It will pick up on the tone you want.

Iterate over multiple rounds; don’t expect perfection in one go: It’s normal to be unsatisfied with the first draft. Tell it what needs changing—“Make it more concise,” “Remove the third paragraph and add a specific example”—and it will execute those instructions accurately.

Break tasks down: Instead of saying, “Help me write a complete business plan,” try, “First, help me write an executive summary, 500 words, targeted at investors.” Tackle it piece by piece, and the quality will be much better.

Maintain critical thinking about the results: ChatGPT confidently states incorrect information. Verify numbers, dates, quotes, and specialized knowledge—never use them blindly.

Is It Worth It?

For most people, the best way to view ChatGPT is as a “smart assistant available anytime.” It can’t replace your thinking, but it can save you from a huge amount of repetitive mental labor. If drafting an email takes you 20 minutes, having it draft and then refine it might take just 5; looking up a concept in documentation might take half an hour, while getting an explanation from ChatGPT could take only 3 minutes. This efficiency gap adds up to something substantial over time.

Start with the free version to see what problems it can solve for you. If you find yourself using it every day, upgrading to Plus is well worth it.