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autoreg-skills-max/skills/reverse-proxy-gateway/references/xai-oauth-flow.md

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xAI OAuth PKCE Flow

Complete constants and flow for xAI (Grok) OAuth auto-registration. Mirrors 9router's implementation.

Constants

XAI_CLIENT_ID = "b1a00492-073a-47ea-816f-4c329264a828"
XAI_ISSUER = "https://auth.x.ai"
XAI_SCOPE = "openid profile email offline_access grok-cli:access api:access"
XAI_LOOPBACK_PORT = 56121
XAI_CALLBACK_PATH = "/callback"
XAI_REDIRECT_URI = f"http://127.0.0.1:{XAI_LOOPBACK_PORT}{XAI_CALLBACK_PATH}"
XAI_PKCE_VERIFIER_BYTES = 96
XAI_API_BASE = "https://api.x.ai/v1"
XAI_USER_AGENT = "grok-cli/9router"

OIDC Discovery

GET https://auth.x.ai/.well-known/openid-configuration
→ authorization_endpoint, token_endpoint
Static fallbacks:
  authorize: https://auth.x.ai/oauth2/authorize
  token: [REDACTED]

OAuth Flow

1. PKCE Setup

verifier = base64url(secrets.token_bytes(96))  # 96 bytes, no padding
challenge = base64url(sha256(verifier.encode()))
state = secrets.token_urlsafe(32)

2. Authorization URL

GET {authorize_url}?
  response_type=code
  client_id=b1a00492-073a-47ea-816f-4c329264a828
  redirect_uri=http://127.0.0.1:56121/callback
  scope=openid profile email offline_access grok-cli:access api:access
  code_challenge={challenge}
  code_challenge_method=S256
  state={state}
  nonce={hex}
  plan=generic
  referrer=cli-proxy-api

3. Token Exchange

POST {token_url}
Content-Type: application/x-www-form-urlencoded

grant_type=authorization_code
client_id=b1a00492-073a-47ea-816f-4c329264a828
code={code}
redirect_uri=http://127.0.0.1:56121/callback
code_verifier={verifier}

# Response:
# {"access_token": "xai-...", "refresh_token": "...", "expires_in": 3600, ...}

4. Token Refresh

POST {token_url}
grant_type=refresh_token
client_id=b1a00492-073a-47ea-816f-4c329264a828
refresh_token={refresh_token}

API Usage

POST https://api.x.ai/v1/chat/completions
Authorization: Bearer {access_token}
Content-Type: application/json
User-Agent: grok-cli/9router

{"model": "grok-4.6", "messages": [{"role": "user", "content": "..."}], "stream": true}

Grok 4.6 Model Details

  • Released: August 12, 2026
  • Context: 500,000 tokens
  • Pricing: $2/$0.50/$6 per 1M tokens (input/cached/output) below 200K
  • Reasoning: low, medium, high (default), xhigh
  • Modalities: text + image input, text output
  • API: Chat Completions + Responses API
  • Also available: grok-build-0.1 (coding agent model)

Gateway Implementation

See gw46.py at C:\Users\User\Documents\grok46gw\gw46.py for a complete FastAPI gateway:

  • Key pool (env vars + SQLite DB + OAuth tokens)
  • Round-robin key selection
  • OpenAI-compatible /v1/chat/completions and /v1/responses
  • OAuth auto-registration web flow at /oauth/register
  • Account management at /accounts