Install Claude

Install Node

# 1. Add the NodeSource repository (Node.js v22.x)
curl -fsSL https://deb.nodesource.com/setup_22.x | sudo -E bash -

# 2. Install Node.js
sudo apt install -y nodejs

# 3. Verify the installation
node --version
npm --version

Install Claude Code

# 4. Install Claude Code globally via npm
sudo npm install -g @anthropic-ai/claude-code

# 5. Verify the installation
claude --version

Set environment variables

Method 1: Set global environment variables

# 1. Open the ~/.bashrc file
nano ~/.bashrc

# 2. Add the following content
export ANTHROPIC_BASE_URL=https://api.deepseek.com/anthropic
export ANTHROPIC_AUTH_TOKEN=sk-YourDeepSeekKey
export ANTHROPIC_MODEL=deepseek-v4-pro[1m]
export ANTHROPIC_DEFAULT_OPUS_MODEL=deepseek-v4-pro[1m]
export ANTHROPIC_DEFAULT_SONNET_MODEL=deepseek-v4-pro[1m]
export ANTHROPIC_DEFAULT_HAIKU_MODEL=deepseek-v4-flash[1m]
export CLAUDE_CODE_SUBAGENT_MODEL=deepseek-v4-flash
export CLAUDE_CODE_MAX_CONTEXT_TOKENS=1000000

Method 2: Set Claude environment variables

Step 1: Create the config directory and file

mkdir -p ~/.claude
nano ~/.claude/settings.json

Step 2: Paste the following content

Replace sk-YourDeepSeekKey with the API key you applied for on the DeepSeek website:

{
  "env": {
    "ANTHROPIC_BASE_URL": "https://api.deepseek.com/anthropic",
    "ANTHROPIC_AUTH_TOKEN": "sk-YourDeepSeekKey",
    "ANTHROPIC_MODEL": "deepseek-v4-pro[1m]",
    "ANTHROPIC_DEFAULT_OPUS_MODEL": "deepseek-v4-pro[1m]",
    "ANTHROPIC_DEFAULT_SONNET_MODEL": "deepseek-v4-pro[1m]",
    "ANTHROPIC_DEFAULT_HAIKU_MODEL": "deepseek-v4-flash[1m]",
    "CLAUDE_CODE_SUBAGENT_MODEL": "deepseek-v4-flash",
    "CLAUDE_CODE_MAX_CONTEXT_TOKENS": "1000000"
  }
}