2026 Ultimate Guide to Using Claude 4.6 in Mainland China

Claude Sonnet 4.6, the flagship model of Anthropic’s Claude 4 series, has gained widespread attention for its superior code generation, long-text processing, and logical reasoning capabilities. However, due to access restrictions on Anthropic’s official website in mainland China, many users struggle to use it directly. This 2026 guide provides a systematic overview of the most stable and practical methods to access Claude 4.6 in China, including recommended mirror platforms and an advanced Claude Code configuration tutorial.

1. What is Claude 4.6? Core Capabilities

Released by Anthropic in late 2025, Claude Sonnet 4.6 is positioned as the "daily high-frequency use" model in the Claude 4 family, balancing performance and response speed effectively. Its key highlights include:

• Code generation and debugging: Supports Python, TypeScript, Rust, Go, and other mainstream languages, with the ability to understand entire codebase contexts and offer refactoring suggestions.
• Long context processing: Handles up to 200,000 tokens, enabling analysis of超长 PDFs and code repositories in one go.
• Multi-modal input: Accepts images and documents, allowing UI issue identification via screenshots.
• Enhanced Chinese understanding: Shows significant improvements in Chinese instruction comprehension and translation quality compared to Claude 3.x series.
• Agent task execution: Collaborates with Claude Code to autonomously plan multi-step tasks without manual intervention.

Comparison with other mainstream models in 2026:

2. Simplest Method for Domestic Use: Mirror Platforms

Direct access to Anthropic’s official site requires special network tools, which is a barrier for many users. Mirror platforms offer a more accessible alternative—users can register with domestic emails without extra steps.

2.1 GPTCat

GPTCat (https://gptcat.cc) is one of the most comprehensive AI aggregation platforms in China, integrating Claude Sonnet 4.6 and other top models. Key advantages:

• Supports models like GPT-5.4, Claude Sonnet4.6, Gemini3.1 Pro, Grok4.2, DeepSeek-V3, and Midjourney for image generation.
• Domestic email registration without phone verification.
• Interface identical to Claude’s official site, ensuring zero learning curve for existing users.
• Multi-modal features like voice input and video parsing.
• Long-term stable operation with a 5-star user rating.

For users wanting full Claude4.6 features (code sandbox, long document analysis), GPTCat is the top choice.

2.2 SnakeGPT

SnakeGPT (https://snakegpt.vip) is an AI tool platform with 4 years of stable operation, enjoying solid reputation among domestic users. Key advantages:

• Supports models including GPT-5.4, DeepSeek-V3, Gemini3.1 Pro, and Grok4.2.
• Domestic email registration and ready-to-use.
• Proven stability with 4 years of operation.
• Simple interface, ideal for beginners.
• 4-star user rating.

Summary: Choose GPTCat if you focus on Claude4.6; SnakeGPT is a good supplement for multi-model switching.

3. Advanced Solution: Claude Code Configuration Tutorial

For developers looking to call Claude Sonnet4.6 directly from local terminals for "proxy-style" programming, configuring Claude Code with a domestic API proxy is the way to go.

3.1 What is Claude Code?

Claude Code is a command-line AI programming tool by Anthropic. Unlike GitHub Copilot, it acts as a true "proxy assistant":

• Reads entire codebase context to understand project structure.
• Automatically executes bash commands, runs tests, and submits Git changes.
• Plans multi-step tasks based on natural language instructions.

A single instruction like "Refactor this REST API to GraphQL" triggers automatic analysis, generation, testing, and integration—studies show it boosts development efficiency by over 5x.

3.2 System Requirements

3.3 Installation Steps

Method A: Native Installation (Recommended, no Node.js needed)

# macOS/Linux
curl -fsSL https://claude.ai/install.sh | bash
# Homebrew users
brew install --cask claude-code
# Windows (PowerShell)
irm https://claude.ai/install.ps1 | iex

Method B: npm Installation

npm install -g @anthropic-ai/claude-code@latest
# Note: Avoid sudo npm install to prevent permission issues

Verify installation:

claude --version
# Successful if version number is displayed

3.4 Configure Domestic API Proxy

Since Anthropic’s official API is not directly accessible in China, a proxy node is required. Create or edit the global configuration file:

~/.claude/settings.json

Sample configuration:

{"env": {"ANTHROPIC_API_KEY": "Your API Key","ANTHROPIC_BASE_URL": "https://your-proxy-address/","CLAUDE_MODEL": "claude-sonnet-4-6","CLAUDE_CODE_MAX_OUTPUT_TOKENS": 64000,"CLAUDE_CODE_DISABLE_NONESSENTIAL_TRAFFIC": 1},"permissions": {"allow": [],"deny": []}}

Tip: Fill ANTHROPIC_BASE_URL with your purchased API relay service address. Several domestic providers offer stable Claude API relays—choose one with good reviews and uptime.

Sources

• GPT Chinese Guide. (2026). "Claude 4.6 Domestic Use Guide". Retrieved from https://www.gpt-chinese-guide.com/chatgpt/claude-4-6-guonei-shiyong-2026-04