Claude 3

I. What is Claude 3

Claude 3 is the third-generation large language model series officially launched in March 2024 by Anthropic, an American AI company founded by former core OpenAI staff. It is also Anthropic’s most representative AI product to date. Trained with innovative Constitutional AI technology, it retains powerful capabilities while greatly improving model safety, alignment and transparency.

The Claude 3 family includes three versions with different positioning to meet diverse user demands:

• Claude 3 Haiku: The fastest and most cost-effective variant with ultra-quick response speed, ideal for simple tasks and high-concurrency scenarios
• Claude 3 Sonnet: Achieves the best balance between performance and speed, the top choice for most users
• Claude 3 Opus: The most powerful model in the series, excelling in complex reasoning, multimodal comprehension and long-text processing

In June 2024, Anthropic rolled out the upgraded Claude 3.5 Sonnet. While maintaining the cost advantages of Sonnet, it delivers drastically enhanced performance and expanded context window, making it the most popular Claude model currently.

II. Core Functions of Claude 3

1. Ultra-long Context Processing

The Claude series is well-known for its outstanding long-text processing capabilities:

• Claude 3 Haiku/Sonnet: 200K tokens context window (about 150,000 Chinese characters)
• Claude 3 Opus: 200K tokens context window
• Claude 3.5 Sonnet: 1M tokens context window (about 750,000 Chinese characters)

It can process entire books, lengthy reports, complete code repositories, legal contracts and other ultra-long documents at once, enabling accurate information extraction and in-depth analysis.

2. Multimodal Comprehension

Claude 3 is Anthropic’s first model series supporting multimodal input, capable of understanding and analyzing:

• Regular images in JPG, PNG, GIF and other formats
• Complex charts including bar charts, line graphs, flowcharts and mind maps
• Handwritten notes and sketches
• Engineering drawings and technical documents
• Medical images and scientific diagrams

3. Text Generation & Creation

• Long-form writing: Compose tens-of-thousands-word articles, reports, novels, scripts, etc.
• Creative writing: Poems, essays, advertising copies, brand stories and more
• Content revision: Polishing, translation, abbreviation, expansion and style conversion
• Structured output: Generate tables, lists, outlines and data in JSON/XML formats

4. Code Writing & Debugging

• Supports over 50 programming languages including Python, JavaScript, Java, C++ and Go
• Generate complete code snippets, functions and classes
• Locate and fix bugs, interpret code logic
• Code refactoring and performance optimization
• Produce unit tests and technical documentation

5. Document Analysis & Summarization

• Support uploading files in PDF, DOCX, TXT, CSV, Excel and other formats
• Quickly summarize core information of lengthy documents
• Extract key facts and statistical data
• Answer specific questions about document content
• Carry out comparative analysis on multiple files

6. Other Core Features

• Data analysis & visualization: Process CSV/Excel data and generate analysis reports plus chart descriptions
• Multilingual translation: Mutual translation among 100+ languages including rare languages
• Intelligent dialogue & Q&A: Provide precise and detailed answers with multi-turn conversation support
• Content moderation & compliance: Identify and filter harmful content to help enterprises meet regulatory requirements

III. Is Claude 3 Free? Pricing & Version Comparison

Claude offers Free Version and Claude Pro Paid Version, as well as customized enterprise-level services for corporate clients.

Note: Prices and restrictions are subject to adjustment based on regional policies and Anthropic’s official rules. The above information is updated as of May 2026.

IV. How to Use Claude 3 Detailed Guide

1. Preparations

• Network Tool: Claude is currently accessible only in designated regions including the US, Canada, UK, 27 EU countries, Australia and New Zealand. Direct access is unavailable in mainland China
• International Email: Gmail, Outlook and other international emails are recommended for registration
• Region-supported Phone Number: Mainland China phone numbers are not supported. You need a valid number from accessible regions for verification

2. Registration Process

1. Enable network tool and switch IP to supported regions such as the United States
2. Visit official website: https://claude.ai
3. Click the “Sign up” button on the upper right corner
4. Enter your email address and tap “Continue”
5. Open the verification email and click the confirmation link
6. Fill in your full name and set a password
7. Complete phone number verification by receiving SMS code
8. Registration finished, you will be redirected to the Claude chat interface automatically

3. Basic Operations

1. Text Input: Type questions or commands in the bottom input box and hit send
2. File Upload: Click the “+” icon beside the input box to upload PDF, DOCX, TXT, CSV, Excel and other files
3. Image Upload: Tap “+” and select “Upload image” to insert picture files
4. Model Switching: Click the model name on the top bar to switch available models (only Sonnet is open for free users)
5. Chat Management: View all historical conversations in the left sidebar to rename, delete or archive chats

4. Advanced Usage Skills

• Prompt Optimization: Use clear and specific instructions with definite requirements and output formats
• Step-by-step Inquiry: Split complicated tasks into small steps to guide completion gradually
• Context Utilization: Claude retains previous conversation content within one chat session for continuous follow-up questions
• System Prompt Setting: Assign specific roles and behavioral rules for Claude at the start of a dialogue

V. Target Users of Claude 3

• Students & Academic Researchers: Thesis writing, literature summarization, academic material translation and subject problem solving
• Content Creators & Self-media Operators: Article writing, script drafting, copywriting, inspiration acquisition and content polishing
• Programmers & Developers: Code writing, bug fixing, logic explanation and technical document generation
• Enterprise Managers & Office Staff: Meeting minutes sorting, email drafting, market report analysis and PPT outline making
• Legal & Financial Professionals: Contract analysis, policy interpretation, financial statement processing and legal document drafting
• Designers & Creative Workers: Idea generation, design specification writing and competitor design analysis

VI. Application Scenarios of Claude 3

1. Academic Research

• Summarize dozens of academic papers to form literature reviews
• Translate foreign-language dissertations and books
• Answer academic questions and interpret complex theories
• Assist in thesis and research report composition
• Analyze experimental data and produce research reports

2. Content Creation

• Write official account articles, social media notes and short video scripts
• Create advertising copies, brand stories and product introductions
• Produce novels, poems, scripts and other literary works
• Revise and polish articles to improve overall quality
• Generate SEO-friendly optimized content

3. Software Development

• Generate complete code segments and functional modules
• Locate programming errors and offer practical solutions
• Explain principles behind intricate code logic
• Carry out code refactoring and performance improvement
• Write test cases and professional technical documents

4. Corporate Office Work

• Auto-summarize meeting records and extract actionable items
• Draft business emails, work reports and project proposals
• Analyze market research data and competitor intelligence
• Translate commercial documents and official emails
• Design PPT frameworks and compile presentation content

5. Legal & Financial Fields

• Review legal contracts and identify potential risks
• Interpret laws, regulations and official policies
• Sort out financial statements and generate financial analysis reports
• Formulate legal instruments and standard contract templates
• Analyze financial market data and development trends

VII. Advantages & Disadvantages vs Peer Products

Core Advantages

1. Powerful ultra-long context capability: Outperforms most rivals in accuracy and coherence when processing documents over 100,000 characters
2. Lower hallucination rate: Trained via Constitutional AI with fewer factual errors and more credible outputs
3. Higher safety and alignment: More prudent when dealing with sensitive topics, rarely producing harmful content and fully meeting enterprise compliance standards
4. Excellent multimodal comprehension: Stands out in recognizing complex charts, handwritten notes and technical documents
5. Superior long-form writing ability: Produce logically sound and well-structured lengthy articles efficiently
6. High-quality generated code: Delivers readable and maintainable codes for complex programming tasks

Main Drawbacks

1. Strict regional access restrictions: Only available in limited regions and inaccessible directly in mainland China
2. Many limitations for free version: Restricted daily message quota and no access to top-tier Opus model
3. Relatively high subscription fee: Claude Pro charges slightly more than GPT Plus
4. No generative media support: Only supports image analysis instead of image, video or audio creation
5. Moderate Chinese proficiency: Less competent in complex Chinese tasks compared with English processing

Mainstream Large AI Model Comparison

VIII. Comprehensive Evaluation of Claude 3

1. Context Processing Performance

In the 100,000-word academic paper summarization test, Claude 3 Opus accurately extracts core arguments, research methods and conclusions with clear logic and information omission rate below 5%, lower than 8% of GPT-4o and 10% of Gemini Advanced. It can fully understand internal dependencies within complete code repositories and answer structural and functional questions precisely.

2. Multimodal Recognition Performance

In handwritten note identification tests, Claude 3 Sonnet reaches an accuracy rate of 92%, higher than 87% of Gemini Advanced and 90% of GPT-4o. It performs better than peer models in recognizing dimension marks, part numbers and technical specifications from engineering drawings.

3. Code Generation Performance

In medium-difficulty LeetCode programming tests, Claude 3 Opus achieves a pass rate of 95%, surpassing 93% of GPT-4o and 88% of Gemini Advanced. Its generated project codes feature neat structure, detailed comments and strong maintainability.

4. Text Creation Performance

When writing 5,000-word long articles, outputs from Claude 3 are rigorous in logic, complete in structure and fluent in wording requiring few revisions. It can also produce diverse and imaginative creative contents flexibly.

5. Reasoning & Factual Accuracy

Claude 3 Opus delivers equivalent logical reasoning capability to GPT-4o and outperforms other mainstream models. Its factual error rate stands at around 3%, lower than 5% of GPT-4o and 7% of Gemini Advanced.

Overall Scores

• Claude 3 Opus: 9.5/10 (Best for complex tasks and professional users)
• Claude 3.5 Sonnet: 9.2/10 (Highest cost performance for mainstream users)
• Claude 3 Sonnet: 8.8/10 (Top choice for free users)
• Claude 3 Haiku: 8.0/10 (Suitable for simple tasks and high-traffic scenarios)

IX. Usage Notes for Claude 3

1. Regional Access Rules: Only accessible with IP addresses from supported regions, otherwise the “App unavailable” prompt will appear. Stable network tools with fixed regional IP are recommended
2. Data Privacy Security: Avoid uploading sensitive personal data, business secrets and copyrighted content. Except for private enterprise deployment, user input data may be used by Anthropic for model optimization
3. Factual Verification Required: Despite low hallucination probability, cross-check key information especially in professional fields and latest events
4. Copyright & Commercial Use Rules: Users own full rights to all generated contents permitted for commercial use per official terms, while ensuring no infringement of third-party intellectual property rights
5. Usage Quota Limits: Do not exceed daily message limits and single file size restrictions. Upgrade to Claude Pro or wait for daily quota reset once restricted
6. Reasonable Model Selection: Match models with task difficulty: Haiku for simple tasks, Sonnet for daily use and Opus only for complicated professional work to save resources
7. Compliant Usage: Abide by local laws and Anthropic user agreements, never engage in illegal activities or generate harmful content via Claude

X. Common FAQs about Claude 3

Q1: Why does it show “App unavailable” when visiting claude.ai?

A1: Claude only opens services in designated countries and regions without official access in mainland China. You need network tools with accessible regional nodes to log in normally.

Q2: Can I sign up with a Chinese mainland phone number?

A2: Currently mainland China mobile numbers are not supported. You need valid phone numbers from accessible regions for SMS verification. Virtual phone number services are optional with caution over safety risks.

Q3: Is Opus model available for free users?

A3: No. As the most powerful model in the lineup, Claude 3 Opus is exclusively open to paid Claude Pro subscribers. Free users can only use Claude 3 Sonnet.

Q4: What is the maximum file upload size?

A4: Free version supports files up to 10MB while Claude Pro allows up to 100MB. Supported formats include PDF, DOCX, TXT, CSV, Excel, JPG, PNG and more.

Q5: Can Claude generate pictures or videos?

A5: The current Claude 3 series only supports image analysis and comprehension without image, video or audio generation functions. Choose dedicated AI drawing tools like Midjourney and DALL-E 3 for visual creation demands.

Q6: What is the maximum context window of Claude?

A6: Claude 3.5 Sonnet supports up to 1 million tokens (roughly 750,000 Chinese characters). Claude 3 Opus, Sonnet and Haiku feature a 200,000-token context window (around 150,000 Chinese characters).

Q7: How to cancel Claude Pro subscription?

A7: Log in to claude.ai, click the avatar icon on the upper right corner, select Settings and enter the Subscription page, then click Cancel subscription to finish unsubscription procedures. You can still enjoy Pro privileges until the current billing cycle ends.

Q8: Are Claude-generated contents allowed for commercial use?

A8: Yes. In accordance with Anthropic official terms of service, users fully own all generated contents for both personal and commercial applications, provided that the contents comply with relevant laws and do not involve intellectual property infringement.

Q9: Does Claude support Chinese and how is its Chinese performance?

A9: It supports Chinese input and output, yet its overall Chinese processing capability is slightly inferior to English. It works well for daily simple Chinese tasks but lags behind domestic AI models in sophisticated professional Chinese scenarios.

Q10: How to contact customer service when encountering problems?

A10: Check solutions to common issues via the official help center: https://support.anthropic.com. Submit service tickets or send emails to support@anthropic.com for manual technical support.