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Claude

Claude — User Guide

Anthropic's assistant—strong at long documents and code.

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Strengths
  • Supports 200K token ultra-long context and can process an entire book or large code base at once
  • Reason more carefully, answer more cautiously, and reduce "serious nonsense"
  • The writing style is natural and smooth, and the quality of long articles is better than most competing products
  • Strong ability to follow instructions and high completion of complex tasks
  • It is safer to handle sensitive topics and more suitable for corporate compliance scenarios.
Best for
  • Handle very long PDFs, contracts, reports (upload entire document at once)
  • Legal, medical, and financial analysis requiring careful reasoning
  • Long-form writing: novels, reports, technical documents
  • Code Review: Upload your entire code base for analysis
  • Professional scenarios that require more reliability and less illusion

Long document processing

Claude's biggest advantage is its extremely long context, which allows it to process the entire document at once.

Scenario

Upload the complete PDF contract and extract key terms

Prompt example 
[Upload contract PDF]




Please help me analyze this contract, focusing on:


1. Payment terms (amount, time, method)


2. Liability clauses for breach of contract


3. Ownership of intellectual property rights


4. Conditions for termination of contract




Organize it in table format and mark the position of each clause in the original
text (which page/article).
Output / what to expect

Claude will read the entire contract in full and output a structured form:

  • Summary of each key clause

  • Original location reference

  • Potential risk reminder (e.g.: a certain clause is unfavorable to Party A)

Tips

Just ask questions directly after uploading the file. Claude will remember the entire document and can ask questions in multiple rounds.

Scenario

Analyze long-form research reports and generate executive summaries

Prompt example 
[Upload 50 page research report]




Please generate an Executive Summary for this report, requiring:


- Length: within 500 words


- Contains: core findings (3-5 items), main conclusions, and implications for
our business


- Language: Business Chinese, can be sent directly to senior executives
Output / what to expect

Output a concise executive summary, capture the core of the report, and use professional language.

Executives can understand the key points of the report in 2 minutes.

Tips

Clarify the audience (executives/technical team) and length limit of the summary, and the output will be more accurate.

complex reasoning and analysis

Claude performed better on tasks that required multi-step reasoning and gave more reliable answers.

Scenario

business decision analysis

Prompt example 
Our company is considering whether to enter the Southeast Asian market.
Please help me do a SWOT analysis:




Background information:


- We are a B2B SaaS company, our main product is HR management system


- Currently has 500 corporate customers in China


-Team size: 50 people, technical team: 20 people


- Budget: RMB 2 million for the first year




Please analyze the strengths, weaknesses, opportunities, and threats, and give
suggestions on whether to enter and which countries to consider.
Output / what to expect

Claude will give a detailed SWOT analysis:

  • Advantages: Existing products and technology accumulation

  • Disadvantages: localization costs, language barriers

  • Opportunities: Southeast Asia’s accelerated digitalization and rising labor costs drive HR automation

  • Threats: local competitors, policy risks

  • Recommendation: Prioritize Singapore (English-speaking environment, friendly policies) as a pilot

Tips

The more background information provided, the more relevant the analysis will be.

Code review and refactoring

Claude can handle large code files in one go, performing comprehensive code reviews.

Scenario

Upload the entire module for code review

Prompt example 
[Paste 200 lines of Python code]




Please conduct a Code Review on this code, focusing on:


1. Potential Bugs and Security Vulnerabilities


2. Performance issues (time complexity, memory usage)


3. Code readability and maintainability


4. Whether it complies with PEP 8 specifications




Mark each issue with a priority level (high/medium/low) and provide suggestions
for modifications.
Output / what to expect

Output a structured Code Review report:

  • High priority: SQL injection risk (line 45), unhandled exception (line 78)

  • Medium priority: O(n²) loop can be optimized to O(n) (line 120)

  • Low priority: variable naming is not standardized (multiple places)

Each question comes with a modified code example.

Tips

Tell Claude the purpose and target audience of your code, and the review will be more targeted.

Compared with similar tools

ToolStrengthBest forPricing
Claude This toolVery long context, detailed reasoning, and long writingProfessional scenarios where long documents are processed and reliable reasoning is requiredFree version / Pro $20/month
ChatGPTThe richest ecosystem, GPTs plug-ins, data analysisCommon tasks and scenarios that require plug-in extensionsFree version / Plus $20/month
GeminiReal-time search, Google ecosystem integrationScenarios that require the latest informationFree version / Advanced $19.99/month

Sources & references: