Claude AI Guide 2025: Utilizing 200K Context Window & Projects

Anthropic's Claude AI is emerging as the strongest competitor to ChatGPT, especially when it comes to long-form writing and analyzing complex documents.

Claude AI

PART 1: WHAT IS CLAUDE AI?

Introduction:

Claude is a Large Language Model (LLM) created by Anthropic (a company founded by former OpenAI employees). It focuses on:

Safety: Highly secure, significantly fewer hallucinations.
Helpfulness: Extremely useful, answers hit the core of the prompt.
Honesty: It will admit if it doesn't know the answer.

Current Models:

Model	Context	Strengths	Price
Claude 3.5 Sonnet	200K	Best overall balance	$3/$15 per 1M tokens
Claude 3 Opus	200K	Most intelligent	$15/$75 per 1M tokens
Claude 3 Haiku	200K	Fastest, cheapest	$0.25/$1.25 per 1M tokens

Recommendation: Use Claude 3.5 Sonnet for 95% of use cases.

PART 2: CLAUDE VS CHATGPT

When to use Claude?

✅ Writing long-form content (blogs, ebooks, reports).
✅ Analyzing highly complex documents (legal, medical).
✅ Coding (especially refactoring large files).
✅ When ultra-high accuracy is required.

When to use ChatGPT?

✅ When you need plugins (web browsing, image generation).
✅ Voice mode.
✅ Quick brainstorming.

PART 3: EXCLUSIVE FEATURES

1. Projects (Workspace)

Concept: Create a dedicated workspace for each project, featuring:

Custom instructions: Specific guidelines just for this project.
Knowledge base: Upload reference documents (up to 200K tokens).
Conversation history: Keeps all project-related chats in one place.

Use cases:

Project 1: AI Blog Writing → Upload your personal style guide and past articles.
Project 2: Code Review → Upload coding standards and the core codebase.
Project 3: Legal Analysis → Upload contracts and laws.

2. Artifacts (Code/Document Preview)

Concept: When Claude generates code, documents, or SVGs, it displays them in a separate panel (the "Artifacts" window) rather than mixing them into the chat stream.

Benefits:

Easy to copy/paste code.
Instant live preview of web apps (HTML/React).
Faster iteration.

3. Extended Context (200K tokens)

Concept: Claude can "remember" roughly 500 pages of text in a single conversation.

Real-world Example:

Upload: [Entire Next.js codebase - 50K tokens]

Prompt: "Analyze the architecture of this app. Find:
1. Potential performance bottlenecks.
2. Security vulnerabilities.
3. Code smells.
4. Suggestions for improvement."

PART 4: PROMPTING TECHNIQUES FOR CLAUDE

1. XML Tags (Claude's Preference)

Claude naturally "prefers" XML tags over Markdown for structure:

✅ Good Practice:

<context>
[Your context here]
</context>

<task>
[Your task here]
</task>

<output_format>
[Format rules]
</output_format>

2. Thinking Tags (Chain of Thought)

Force Claude to think before generating the final output:

<thinking>
Please analyze this step-by-step:
1. [...]
2. [...]
</thinking>

<answer>
[Final answer provided here]
</answer>

CONCLUSION

Claude AI is a fantastic choice for:

Writers: Need long, high-quality output without repetition.
Developers: Need context-aware code reviews.
Analysts: Need to parse 100-page PDFs instantly.

Use Claude for deep work and ChatGPT for quick tasks!