Use Claude Code and Codex with one LaRouter API key: set up in 2 minutes

Claude Code and Codex are two AI coding tools that run in your terminal. Normally each needs its own account: Claude Code with Anthropic, Codex with OpenAI, each paid by international card. With LaRouter you use one API key for both, pay by VND bank transfer, and businesses get a VAT invoice.

▶ Watch the setup video (about 2 minutes, in Vietnamese): youtu.be/hO1bkBAedy0

This guide sets up each tool. Each takes about 2 minutes.

Before you start

1. Sign in at larouter.lapage.vn and open the dashboard.
2. Copy your API key. The key is for you or your team only; do not paste it anywhere public.
3. Install Claude Code or Codex first, following each tool's own installation guide.

Claude Code

Quick way: one command

On macOS or Linux, open a terminal and run (replace YOUR_KEY with your API key):

curl -fsSL https://larouter.lapage.vn/setup/claude.sh | LAROUTER_KEY='YOUR_KEY' bash

On Windows, open PowerShell:

$env:LAROUTER_KEY='YOUR_KEY'; irm https://larouter.lapage.vn/setup/claude.ps1 | iex

This command only writes the LaRouter address and your API key to ~/.claude/settings.json. Your other settings stay as they are.

Manual way

Open ~/.claude/settings.json and add an env section:

{
  "env": {
    "ANTHROPIC_BASE_URL": "https://i-larouter.lapage.vn/v1",
    "ANTHROPIC_AUTH_TOKEN": "YOUR_KEY"
  }
}

Reopen Claude Code and ask any question. If you get an answer, you are done.

Codex

Quick way

curl -fsSL https://larouter.lapage.vn/setup/codex.sh | LAROUTER_KEY='YOUR_KEY' bash

Windows:

$env:LAROUTER_KEY='YOUR_KEY'; irm https://larouter.lapage.vn/setup/codex.ps1 | iex

Manual way

Open ~/.codex/config.toml, set the model and add the LaRouter provider:

model = "gpt-6.1-sol"
model_provider = "larouter"

[model_providers.larouter]
name = "LaRouter"
base_url = "https://i-larouter.lapage.vn/v1"
wire_api = "responses"
requires_openai_auth = false
experimental_bearer_token = "YOUR_KEY"

Reopen Codex and try a command.

Plans and pricing

• ChatGPT and Claude in one plan, from just 300,000 VND/month (plan T150: $150 of usage per week, reset every 7 days). Each $150 a week is about the size of one Claude Pro or Codex account.
• Six tiers from T150 to T1500 (3,000,000 VND/month, about 10 accounts). Upgrade when you need more; the extra capacity is available as soon as payment is confirmed.
• Annual plan: pay for 12 months, use 13.
• Pay in VND by bank transfer (VietQR). Prices exclude VAT; companies choose "VAT invoice for a company" at checkout and pay 10% VAT on top.

See the plans at larouter.lapage.vn.

What to check if something fails

• Authentication error (401): the key was pasted with missing characters or extra spaces. Copy it again from the dashboard.
• Usage limit reached: check this week's usage in the dashboard; the limit resets after 7 days, or you can upgrade.
• Model not supported: use a model from the list in the dashboard, for example claude-sonnet-5-5 for Claude Code, gpt-6.1-sol for Codex.

Step-by-step guides for each operating system are on the LaRouter docs page. For help with setup, message LaPage on Zalo.