Claude
The most thoughtful AI assistant — built for nuance, long context, and safe deployment.
Quick Specs
| Developer | Anthropic |
| Headquarters | San Francisco, USA |
| Category | Writing & Chat |
| Pricing | Freemium |
| Free Tier | Unlimited messages (rate-limited) |
| Auth Method | API Key (developer) / Email + OAuth (consumer) |
| API Available | ✅ Yes |
| Format | REST / JSON / Streaming SSE |
| SLA / Uptime | 99.9% uptime (API) |
| Rate Limits | Free: rate-limited / API: 50 RPM (Tier 1) to 4K RPM (Tier 4) |
| Compliance | SOC 2 Type II, GDPR, HIPAA (Enterprise) |
| China Access | 🚫 Blocked in China |
| Last Tested | June 2026 |
What Is Claude?
Claude is Anthropic's AI assistant, currently on the Claude 3.7 and Claude 4 family of models. It consistently outperforms ChatGPT on benchmarks requiring long-context understanding, nuanced instruction-following, and careful reasoning — particularly for document analysis tasks where context windows matter. Claude's 200K token context window (roughly 150,000 words) means it can ingest an entire book and answer questions about it in a single session.
The free tier at claude.ai is one of the most generous in the market: unlimited messages with rate limiting rather than a hard message cap. The paid Claude Pro plan ($20/month) removes rate limits and adds access to the more powerful Claude 3.7 Sonnet Extended Thinking mode, which can reason for minutes on complex problems before answering.
For developers, the Anthropic API is competitive with OpenAI's pricing and offers unique features like prompt caching (saves up to 90% on repeated system prompts), computer use (Claude can control a browser), and tool use. Claude is the model behind Claude Code — Anthropic's agentic coding CLI that many developers now prefer over GitHub Copilot for complex refactoring tasks.
Key Features
Claude Pricing (2026)
Free
$0/mo- ✓ Claude 3.7 Sonnet
- ✓ Unlimited (rate-limited)
- ✓ File uploads
- ✓ Web search
- ✓ Projects
Best for: Personal use, light tasks
Pro
$20/mo- ✓ Claude 3.7 Sonnet priority
- ✓ Extended Thinking mode
- ✓ Higher rate limits
- ✓ Priority access to new models
- ✓ 5× more usage vs free
Best for: Power users, professionals
Max
$100–$200/mo- ✓ Highest rate limits
- ✓ First access to new models
- ✓ Ideal for Claude Code
- ✓ 20× or 40× Pro usage
Best for: Developers, heavy API users via claude.ai
API (Pay-as-you-go)
From $0.25/M tokens- ✓ Claude 3.5 Haiku: $0.25/$1.25
- ✓ Claude 3.7 Sonnet: $3/$15
- ✓ Claude 3 Opus: $15/$75
- ✓ Prompt caching: 90% off repeated content
Best for: Developers building apps
Claude: Pros & Cons
+ Pros
- ✓Best-in-class for long documents (200K token context)
- ✓Most natural, human-like writing style
- ✓Follows complex multi-step instructions reliably
- ✓Generous free tier with unlimited (rate-limited) messages
- ✓Prompt caching saves significant API costs
- ✓Computer use capability for agentic tasks
− Cons
- ✗No built-in image generation (unlike ChatGPT)
- ✗Smaller third-party integration ecosystem than OpenAI
- ✗Blocked in China — requires VPN
- ✗Claude 3 Opus is expensive at $15/$75 per million tokens
Best Use Cases for Claude
Long Document Analysis
Analyzing legal contracts, research papers, codebases, or books. 200K context window handles full-length documents without summarization loss.
Technical Writing
API documentation, research papers, and detailed technical guides. Claude's output style is more precise and less verbose than GPT-4o.
Code Review & Refactoring
Via Claude Code CLI, can review entire repositories, propose refactors, and implement changes autonomously.
Multi-step Research
Extended Thinking mode breaks down complex problems step-by-step before responding — useful for strategy, analysis, and research.
Customer Support Automation
API integration for customer-facing chatbots. Claude's reliability in following system prompts makes it predictable in production.
How to Get Started with Claude
- 1
Visit claude.ai and sign up with email or Google account
- 2
Free tier starts immediately — upload documents and start chatting
- 3
For API: visit console.anthropic.com → API keys
- 4
Install SDK: pip install anthropic
- 5
First API call: client.messages.create(model='claude-3-7-sonnet-20250219', ...)
- 6
For Claude Code: npm install -g @anthropic-ai/claude-code then claude in terminal
🚫 Blocked in China: Claude in China
Claude is blocked in mainland China by the Great Firewall. DNS-level and IP-level blocks prevent direct access.
Solution: A VPN with obfuscation support is required. NordVPN (94% success rate) and ExpressVPN (91%) are the most reliable options for accessing Claude from China.
Full China Access Guide →