How much does Grok 4 Heavy cost?
A third-party pricing page reported SuperGrok Heavy at $300 per month, associating it with a Grok 4 Heavy preview. That page says it was last updated January 8, 2026; the amount is a reported subscription price, not a confirmed current offer. (docs.x.ai)
As of November 12, 2026, xAI’s public pricing page lists Free, Plus, Premium, Super, Ultra, Teams, and Enterprise plans, but does not list SuperGrok Heavy among the displayed plans. That means the public page does not confirm a current Heavy offer for new customers; it does not establish what an existing subscriber may see in their account or checkout. (x.ai)
For rough arithmetic only, 12 months at the reported $300 monthly rate would total $3,600. This is not a quoted annual plan or a confirmed 12-month price.
Is there a Grok 4 Heavy API price?
The xAI developer model pages reviewed do not identify a production API model specifically called Grok 4 Heavy or give a Heavy-specific rate. So a production API budget for Grok 4 Heavy cannot be calculated from the available documentation. (docs.x.ai)
The docs do list a separate multi-agent API model, grok-4.20-multi-agent-0309, at $1.25 per million input tokens, $0.20 per million cached tokens, and $2.50 per million output tokens. The documentation presents it as a multi-agent research model; it does not identify it as Grok 4 Heavy, so those rates should not be used as a Heavy price. (docs.x.ai)
Likewise, third-party prices for Grok 4 generally or Grok 4.1 Fast do not establish a Grok 4 Heavy API rate. Confirm the exact model and applicable rate before estimating production spend.
Bottom line
$300/month is a third-party report about a SuperGrok Heavy subscription, not a confirmed current offer. The current public pricing page reviewed does not list Heavy. The developer docs reviewed describe a separate multi-agent API model, but do not establish that it is Grok 4 Heavy or provide a Heavy-specific API rate.