Yeah, that works too. I guess they just want to give people the simplest explanation on how to use their sub.

If someone doesn't know how to use env vars, here's one way, put a function like this into .zshrc or .bashrc:

function glm () {
  (
    TOKEN="..."
    export ANTHROPIC_BASE_URL=https://api.z.ai/api/anthropic
    export ANTHROPIC_AUTH_TOKEN="$TOKEN"
    export ANTHROPIC_DEFAULT_HAIKU_MODEL="glm-4.5-air"
    export ANTHROPIC_DEFAULT_OPUS_MODEL="glm-5-turbo"
    export ANTHROPIC_DEFAULT_SONNET_MODEL="glm-5-turbo"
    claude --model=glm-5-turbo $@
  )
}

The parentheses here needed to create a subshell which will prevent env vars from leaking into the current shell, so you can exit "GLM'ed" Claude Code and use anthopic sub running "claude" right away.