XAI Router Codex Monthly Service: OpenClaw Integration Guide

If you only care about what you can call today and the simplest way to test it, this post is for you.

What We Provide

XAI Router provides a monthly Codex service behind a unified gateway endpoint. Different clients and calling styles can use the same base URL.

Supported Call Types (Monthly Codex Service)

1. Native passthrough forwarding for Codex clients (CLI / App) Supports both Codex App and Codex CLI. After following the gpt-5.3-codex setup guide for Codex CLI, you can launch Codex App directly.
2. OpenAI Responses API: POST /v1/responses Supports the newer Responses format (input) for everyday generation and common extension use cases.
3. OpenAI Completions API: POST /v1/chat/completions Supports the classic Completions format (messages) for easy migration from existing integrations.
4. Claude API (Anthropic-compatible): POST /v1/messages Supports Claude API-compatible requests (messages + anthropic-version) for direct integration with Anthropic-style clients.

If you only want one line: Codex clients (CLI / App), Responses, Completions, and Claude API are all supported.

Quick call examples

Replace ${XAI_API_KEY} with your own key.

Example 1: Codex client setup (CLI / App)

Set your Codex CLI gateway to https://api.xairouter.com and use ${XAI_API_KEY} as your API key. Once CLI is configured, you can also launch Codex App directly.

Example 2: Responses API

curl https://api.xairouter.com/v1/responses \
  -H "Authorization: Bearer ${XAI_API_KEY}" \
  -H "Content-Type: application/json" \
  -d '{
    "model":"gpt-5.2-codex",
    "stream": false,
    "input":[
      {"type":"message","role":"user","content":[{"type":"input_text","text":"Summarize the top priority in one sentence"}]}
    ]
  }'

Example 3: Completions API

curl https://api.xairouter.com/v1/chat/completions \
  -H "Authorization: Bearer ${XAI_API_KEY}" \
  -H "Content-Type: application/json" \
  -d '{
    "model":"gpt-5.3-codex",
    "stream": false,
    "messages":[{"role":"user","content":"Give me one sentence weather advice for Shanghai today"}]
  }'

Example 4: Claude API (Anthropic-compatible)

curl https://api.xairouter.com/v1/messages \
  -H "x-api-key: ${XAI_API_KEY}" \
  -H "anthropic-version: 2023-06-01" \
  -H "Content-Type: application/json" \
  -d '{
    "model":"gpt-5.3-codex",
    "max_tokens": 256,
    "messages":[{"role":"user","content":"Summarize the top task for today in one sentence"}]
  }'

OpenClaw Support (Important)

XAI Router monthly Codex service supports OpenClaw integration. If you are using OpenClaw, you can point it to XAI Router gateway and use Completions / Responses / Claude API (Anthropic-compatible) calls without complex rewrites.

One-line takeaway: to use the monthly Codex service quickly, connect your client to XAI Router and start calling; for a quick trial, sign up or log in at m.xairouter.com.