Environment Variables

Variable	Required	Description
ANTHROPIC_API_KEY	One of two	API key sent via the x-api-key header
ANTHROPIC_AUTH_TOKEN	One of two	Auth token sent via the Authorization: Bearer header
ANTHROPIC_BASE_URL	No	Custom API endpoint, defaults to Anthropic
ANTHROPIC_MODEL	No	Default model
ANTHROPIC_DEFAULT_SONNET_MODEL	No	Sonnet-tier model mapping
ANTHROPIC_DEFAULT_HAIKU_MODEL	No	Haiku-tier model mapping
ANTHROPIC_DEFAULT_OPUS_MODEL	No	Opus-tier model mapping
API_TIMEOUT_MS	No	API request timeout, default 600000 (10min)
DISABLE_TELEMETRY	No	Set to 1 to disable telemetry
CLAUDE_CODE_DISABLE_NONESSENTIAL_TRAFFIC	No	Set to 1 to disable non-essential network traffic

Configuration Methods

Option 1: .env File

cp .env.example .env

Edit .env (the example below uses MiniMax as the API provider — you can replace it with any compatible service):

# API authentication (choose one)
ANTHROPIC_API_KEY=sk-xxx          # Standard API key via x-api-key header
ANTHROPIC_AUTH_TOKEN=sk-xxx       # Bearer token via Authorization header

# API endpoint (optional, defaults to Anthropic)
ANTHROPIC_BASE_URL=https://api.minimaxi.com/anthropic

# Model configuration
ANTHROPIC_MODEL=MiniMax-M2.7-highspeed
ANTHROPIC_DEFAULT_SONNET_MODEL=MiniMax-M2.7-highspeed
ANTHROPIC_DEFAULT_HAIKU_MODEL=MiniMax-M2.7-highspeed
ANTHROPIC_DEFAULT_OPUS_MODEL=MiniMax-M2.7-highspeed

# Timeout in milliseconds
API_TIMEOUT_MS=3000000

# Disable telemetry and non-essential network traffic
DISABLE_TELEMETRY=1
CLAUDE_CODE_DISABLE_NONESSENTIAL_TRAFFIC=1

Option 2: ~/.claude/settings.json

{
  "env": {
    "ANTHROPIC_AUTH_TOKEN": "sk-xxx",
    "ANTHROPIC_BASE_URL": "https://api.minimaxi.com/anthropic",
    "ANTHROPIC_MODEL": "MiniMax-M2.7-highspeed"
  }
}

Priority: Environment variables > .env file > ~/.claude/settings.json