SKILL.md
🟢 xAI OAuth Onboarding
Use any active xAI account — X Premium, X Premium+, SuperGrok, or SuperGrok Heavy — for grok-4.3, grok-build-0.1, grok-4.20-* and multi-agent models. No separate API key needed.
This is standard OAuth 2.0 (RFC 8628 Device Authorization Grant), not a vendor-custom flow.
Tier → model access
The JWT issued by auth.x.ai carries a tier claim; higher tiers unlock more models from /v1/models. Observed mapping (xAI does not publish this officially):
| Tier | Subscription | Approx. model access |
|---|---|---|
| 1 | X Premium ($8/mo) | grok-4.3 baseline |
| 2 | X Premium+ ($16/mo) | + grok-4.20-0309 variants |
| 3 | SuperGrok ($30/mo) | + reasoning models |
| 4 | SuperGrok Heavy ($300/mo) | + grok-build-0.1 + multi-agent |
status() reports the user's tier so they know which models will be available.