ChatGPT in 2025 is not the ChatGPT of two years ago. It's a full platform with multiple AI models, an agent that browses the web and runs code, an image generator, a video tool, and a developer ecosystem.
Most people use 10% of it. This guide covers 100%.
THE MODEL LINEUP
Understanding which model you're using matters because they have different strengths and speeds.
GPT-4o: The default on all tiers. Fast, multimodal (text + image + voice), great for everyday use.
GPT-4o mini: Faster and cheaper (for API users). Good for simpler tasks.
o3 / o3-mini: OpenAI's reasoning models. Slower but significantly better at math, logic, code, and complex problems. Think before answering.
o4-pro: The most capable model available. Best for the hardest tasks. Slower and only on ChatGPT Pro ($200/month).
When to use which:
- Everyday writing, questions, research → GPT-4o
- Math, logic, complex reasoning, hard problems → o3 or o3-mini
- Cutting-edge tasks where quality matters most → o4-pro (Pro plan)
CORE FEATURES
AGENT MODE (The Biggest Feature Most People Miss) Agent Mode turns ChatGPT from a chatbot into an autonomous agent that can:
- Browse the web in real time
- Search and read multiple websites
- Run code to analyse data
- Fill out forms
- Download and open files
- Complete multi-step tasks without you having to guide each step
How to use: Select "Agent" mode from the model selector. Then give it a multi-step task: "Research the top 10 AI tools for marketing in 2025. Compare them on features, pricing, and ease of use. Create a comparison table and save it as a document."
Agent Mode works best when you give it a clear goal, not step-by-step instructions.
DEEP RESEARCH Similar to Gemini's Deep Research — ChatGPT conducts multi-step research across multiple web sources and returns a comprehensive cited report. Takes 5-10 minutes per task.
How to use: Enable "Deep Research" in the model selector.
Best for: Market research, academic topics, investment research, competitive analysis, comprehensive learning on any subject.
CANVAS A collaborative document editor built into ChatGPT. Similar to Gemini Canvas — you can write and edit long-form content in a side panel with ChatGPT making real-time suggestions.
How to use: Start any writing task and click "Open in Canvas" or ask "Open this in Canvas."
CODE INTERPRETER / DATA ANALYSIS ChatGPT can run Python code to analyse your data. Upload a CSV, Excel file, or PDF and ask ChatGPT to:
- Chart the data
- Calculate statistics
- Clean and format data
- Find trends and anomalies
- Create visualisations
Example: Upload a sales spreadsheet → "Analyse this data and create a chart showing monthly revenue trends. Identify the 3 months with the lowest performance and suggest possible reasons."
CODEX ChatGPT's coding agent. Describe what you want to build in plain English; Codex writes the code, runs it, tests it, and returns the result.
Different from regular code help: Codex operates in a cloud sandbox — it actually executes the code, not just writes it.
Best for: Quick scripts, automations, prototypes, data processing tasks.
GPT IMAGE 2 (DALL-E) Image generation built directly into ChatGPT. Type a description; ChatGPT generates a high-quality image.
What makes it good: Near-perfect text rendering, consistency across multiple images, follows instructions accurately, 2K resolution.
Access: Click the image icon or just describe what you want: "Create an image of..."
SORA (VIDEO) OpenAI's text-to-video model. Available on ChatGPT Plus and Pro. Describe a scene; Sora generates a short video clip.
Current limitations: Short clips (up to 20 seconds), occasional inconsistencies, works best with clear, simple prompts.
VOICE MODE Real-time voice conversation with GPT-4o. More natural than traditional voice assistants because it understands context, can be interrupted, and maintains conversation flow.
Access: Mobile app → microphone icon. Or desktop → microphone icon.
MEMORY ChatGPT can remember things across conversations. When Memory is enabled, ChatGPT learns your preferences, background, and working style over time.
How to manage: Settings → Personalisation → Memory → View and manage memories.
You can also explicitly tell ChatGPT what to remember: "Remember that I prefer bullet points over paragraphs."
PROJECTS Organise your ChatGPT conversations into projects with custom instructions and shared context.
How to use: Sidebar → Projects → New Project → Add instructions and files.
Best for: Ongoing work like managing a client, a newsletter, or a project where you want ChatGPT to always have relevant context.
CUSTOM GPTs Pre-configured versions of ChatGPT built for specific tasks. Find them in the GPT Store or create your own.
Examples: SEO assistant GPT, legal document reviewer GPT, recipe generator GPT, customer service GPT.
Create your own: Explore → Create a GPT → Configure instructions, knowledge, and capabilities.
TASKS Schedule ChatGPT to do things automatically at a set time.
Example: "Every weekday morning at 8am, search the web for the latest AI news and give me a 5-bullet summary."
Access: New conversation → Tasks icon.
CONNECTORS Connect ChatGPT to external apps — similar to Claude Connectors. Available for services like Google Drive, Slack, Notion, and others.
Access: Settings → Connectors.
PRICING (2025)
ChatGPT Free: GPT-4o (limited), basic features, limited image generation ChatGPT Plus ($20/month): GPT-4o, o3-mini, Agent Mode, Deep Research, DALL-E, Sora (limited), Canvas, Memory, Projects ChatGPT Pro ($200/month): Everything in Plus + o4-pro, more Sora, priority access, more Deep Research
50 USE CASES WITH EXACT PROMPTS
[Writing & Content]
- "Write a 1,000-word blog post about [topic] in a [tone] voice for [audience]."
- "Give me 20 headline ideas for an article about [topic]. Include curiosity, benefit, and list styles."
- "Rewrite this email to be shorter, clearer, and more direct." [paste email]
- "Write 5 LinkedIn posts about [topic] with different angles. Keep each under 200 words."
- "Write a product description for [product] that focuses on benefits, not features."
[Research & Analysis] 6. "Deep Research: What are the most important trends in [industry] in 2025?" 7. "Analyse this data and tell me the key insights." [upload CSV/spreadsheet] 8. "Compare [option A] and [option B] for [use case]. Give me a clear recommendation." 9. "What are the main arguments for and against [topic]? Present both sides fairly." 10. "Summarise this document and extract the 10 most important points." [upload PDF]
[Agent Mode Tasks] 11. "Research the top 5 competitors to [my business] and compare them on [criteria]." 12. "Find the best price for [product] across 5 major retailers." 13. "Search for job listings for [role] in [location] and summarise the top 10." 14. "Find recent statistics about [topic] from credible sources." 15. "Research [company] and give me a full overview before my meeting with them."
[Coding & Technical] 16. "Write a Python script that [describe what it should do]." 17. "Debug this code and explain what was wrong." [paste code] 18. "Analyse this spreadsheet and create a bar chart showing [metric]." [upload file] 19. "Convert this Excel data to a clean format and remove duplicates." [upload file] 20. "Write a script that automatically [describe automation]."
[Learning & Education] 21. "Explain [concept] from first principles, starting with the basics." 22. "Create a 30-day study plan for learning [skill or subject]." 23. "Quiz me on [topic] with 10 questions. Grade my answers." 24. "What are the 5 best books about [topic] and what makes each worth reading?" 25. "Teach me [concept] using a real-world analogy I'll never forget."
[Business & Strategy] 26. "Create a SWOT analysis for [business idea or company]." 27. "Write a pitch for [business idea] in under 2 minutes. Make it compelling." 28. "Help me prepare for a negotiation about [situation]. What should I know and say?" 29. "Create a 90-day plan for [goal]. Break it into weekly milestones." 30. "What are the biggest risks in [business decision] and how can I mitigate them?"
[Prompts for Daily Use] 31. "Summarise my inbox for today and tell me what's urgent." [use Connector] 32. "Help me plan this week given my priorities: [list priorities]." 33. "Review this and tell me the 3 most impactful improvements I can make." [paste any work] 34. "Give me 10 ideas for [problem]. No filtering — just quantity." 35. "Reframe this situation from a completely different perspective: [describe situation]."
[Creative] 36. "Write a short story (300 words) about [theme or scenario]." 37. "Create an image of [describe in detail]." 38. "Generate a short video clip showing [describe scene]." [use Sora] 39. "Write song lyrics for a [genre] song about [topic]." 40. "Design a social media post for [brand] about [topic]. Include the copy and image prompt."
[Personal & Professional Development] 41. "Give me an honest critique of this work." [paste any work] 42. "Help me prepare for a job interview at [company] for [role]." 43. "Review my CV and tell me how to make it stronger for [type of role]." [paste CV] 44. "Help me write a performance self-review that highlights my key achievements." 45. "What questions should I ask in this [type of] meeting?"
[Automation with Tasks] 46. "Every morning at 7am, give me a 5-point briefing on the latest [industry] news." 47. "Every Sunday evening, give me a plan for the coming week based on [priorities]." 48. "Every Friday, remind me to complete my weekly review and ask me 5 reflection questions." 49. "On the 1st of each month, help me review my goals and plan next month's priorities." 50. "Every [day] at [time], give me 3 writing prompts to practice [skill]."
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