The Only VPN Safe for
AI CLI Tools in China

One VPN disconnect. One exposed China IP. One permanent ban from Anthropic, OpenAI, or Google. Your entire AI development career depends on a VPN that never leaks.

Protect Your API Access See How It Works
TUN mode captures all CLI traffic Dedicated IP (not on VPN blocklists) Zero IP leaks. Kill switch enabled.
The Risk You Face Every Day

AI Companies Are Permanently Banning
China VPN Users

HIGH RISK

Anthropic (Claude)

September 2025: Updated ToS restricts China access. Real-time risk control detects and rejects high-risk IPs. Detected users face permanent account suspension. No appeal process. Your Claude Code CLI, API keys, and entire subscription -- gone.

HIGH RISK

OpenAI (Codex / GPT)

July 2024: Started blocking API connections from China. Aggressively blacklists known VPN IP ranges (NordVPN, ExpressVPN, Astrill are all flagged). Even one detected connection can trigger account review and potential termination.

MODERATE RISK

Google (Gemini)

Gemini API not available in China, Russia, or Iran. Geo-restricted at API level. While less aggressive on bans than Anthropic/OpenAI, your account is still at risk if China connections are detected on your Google Cloud account.

Why Commercial VPNs Fail AI Developers

Shared IPs Are a Death Sentence for API Access

  • Shared IP pools

    When one user on Astrill's server gets flagged by OpenAI, everyone on that IP gets flagged. You inherit other users' bad behavior.

  • Known VPN IP ranges

    AI companies maintain blocklists of NordVPN, ExpressVPN, and Astrill IP ranges. Your VPN IP is already suspicious before you connect.

  • DNS and WebRTC leaks

    Many VPNs leak DNS queries, revealing your China location. WebRTC in browser-based consoles can expose your real IP even with VPN active.

  • Disconnects expose your real IP

    VPN drops during an API call = your China IP hits the service. Most commercial VPNs have no kill switch, or the kill switch is too slow.

  • Browser-only protection

    Most VPN extensions only protect browser traffic. CLI tools like claude, codex, and gemini make direct API calls that bypass browser proxies entirely.

What happens with a normal VPN 
$ claude code --model opus "fix auth bug"
> Connecting to api.anthropic.com...
> VPN disconnected! Reconnecting...
> WARNING: Real IP 116.23.xxx.xxx exposed
> ERROR: Access denied. Region not supported.
> Your account has been flagged for review.

$ # Three weeks of work. Gone.
The KookVPN Difference

Built Specifically for AI Developer Safety

Private Dedicated IP

Your VPN IP belongs to DigitalOcean's standard hosting range -- not a VPN IP range. AI companies see a normal Singapore cloud server, not a VPN exit node. No IP blocklist contamination from other users.

TUN Mode Captures Everything

OS-level traffic capture means every CLI tool, every API call, every background process routes through the encrypted tunnel. No leaks from direct API connections that bypass browser proxies.

Sub-100ms Kill Switch

If the VPN drops, ALL traffic stops instantly. Your real IP never touches Anthropic, OpenAI, or Google servers. Auto-reconnect restores the connection within seconds.

Undetectable Protocol

VLESS+Reality mimics legitimate HTTPS traffic to microsoft.com. Neither the GFW nor AI company detection systems can identify it as VPN traffic.

With KookVPN connected 
$ claude code --model opus "fix auth bug"
> Connecting to api.anthropic.com... OK
> Model: claude-opus-4  |  Region: Singapore (clean IP)
> Analyzing codebase... 847 files scanned
> Generated fix in src/auth/handler.ts
> Applied 3 changes. Running tests... all passed.

$ codex --provider openai
> Connected. API key verified. No region issues.

$ gemini generate "write deployment script"
> Connected. Generating response...
Verified Compatible

Works With Every AI Development Tool

Every tool below has been tested with KookVPN from inside China. All API connections route through TUN mode automatically.

Claude Code

HIGH RISK

Anthropic

CLI for AI-powered development. One China detection = permanent ban. No appeal process.

OpenAI Codex

HIGH RISK

OpenAI

Code generation from terminal. China IPs aggressively blocked since July 2024.

Gemini CLI

MODERATE

Google

AI assistant for terminal. Geo-restricted in China, Russia, and Iran at API level.

GitHub Copilot

MODERATE

GitHub

AI code completion. Needs consistent clean connection across all IDE integrations.

Cursor IDE

MODERATE

Cursor

AI-first code editor with Claude and GPT. Constant background API calls need reliable VPN.

Windsurf

MODERATE

Codeium

AI-powered IDE. Background model calls fail silently on compromised VPN connections.

The Difference

Commercial VPN vs KookVPN

Feature Commercial VPNs KookVPN
IP Type Shared (thousands of users) Dedicated (you only)
IP Reputation Known VPN range (flagged) Standard cloud hosting IP
CLI Tool Coverage Browser only (proxy) Full OS (TUN mode)
Kill Switch Speed Slow or none Sub-100ms
DNS Leak Protection Often leaks DNS-over-TLS (zero leaks)
GFW Detection Detectable protocols Undetectable (VLESS+Reality)
API Ban Risk High Near zero
From AI Developers in China

They Switched. Their API Access Survived.

I almost lost my Anthropic account when Astrill dropped during a Claude Code session. Switched to KookVPN the same day. Three months of daily use, zero leaks, zero scares.
Full-Stack Developer Guangzhou
The TUN mode is what sold me. I was using a browser extension VPN and didn't realize my terminal API calls were going direct. KookVPN captures everything at OS level.
ML Engineer Beijing
Running Claude Code, Codex, Copilot, and Cursor all day. With NordVPN I had constant connection drops. KookVPN has been rock solid through the entire NPC period.
AI Startup Founder Shanghai

Protect your AI development career

One VPN leak can cost you everything. KookVPN's TUN mode, kill switch, and dedicated IP ensure your API access stays safe.

Get Protected Now Read Setup Guide