$300 per month. That is xAI's new SuperGrok Heavy tier — the only way to get full Grok 4.3 access, maximum rate limits, and the new Grok Build agentic CLI. It costs 10x more than the tier below it (SuperGrok at $30), with nothing between them. And it arrived inside a new corporate reality: xAI merged into SpaceX in February 2026 at a combined $1.25 trillion valuation. Grok now lives inside a defense contractor.

What Happened This Week

xAI launched SuperGrok Heavy at $300/month — its sixth pricing tier and first above $200. The tier sits on top of Free, X Premium ($8), SuperGrok Lite ($10), SuperGrok ($30), and X Premium+ ($40). SuperGrok Heavy includes Grok Build, a terminal-native agentic CLI competing directly with Claude Code and GitHub Copilot. An introductory $99/month price holds for the first six months before the full $300 takes effect.

This sits inside a corporate change from February 2026: xAI merged into SpaceX at a combined $1.25 trillion valuation ($1T SpaceX, $250B xAI), structured as a share exchange. Grok, the Colossus supercomputer, and all xAI products are now housed inside SpaceX. Roughly half of xAI's original 12 co-founders have departed since the merger closed.

What This Means

The pricing is aggressive but rational. $300 puts SuperGrok Heavy in the neighborhood of ChatGPT Pro ($200) and Google AI Ultra ($249.99), above Claude Max ($100). The AI category has a premium tier now. If you need maximum throughput and the latest models, you pay for it. That part is the market doing what markets do.

The governance is different. When xAI was standalone, your Grok data lived inside xAI. Post-merger, your Grok data lives inside SpaceX — the same corporate entity holding government defense contracts with classified work portfolios. The data-flow boundary between "Grok consumer product" and "SpaceX corporate operations" has not been published. I have looked. It is not there.

Consumer Protection Q&A

Q: Does Grok user data stay scoped to Grok product use, or is it accessible to SpaceX corporate operations including government work?

A: As of May 2026, no public documentation defines the boundary. This is the single biggest unanswered question post-merger.

Q: Does SuperGrok Heavy at $300/month include a data-training opt-out?

A: Not specified in public documentation. At that price, it should be standard.

Q: Who is the data controller in EU GDPR terms post-merger?

A: Unclear. xAI may no longer exist as a separate legal entity. EU users currently have no clear address for data-subject access requests.

Q: Is the merger under regulatory investigation?

A: Yes. Investigations are reportedly open in the EU, Asia, and US jurisdictions.

What Happens Next

30 days: Watch for xAI/SpaceX to publish data-flow boundary documentation. June 1 is the most likely window — Microsoft's Copilot billing rollout creates an industry news cycle that consumer-AI companies often use to ship privacy policy updates quietly.

90 days: EU regulatory investigations advance. The GDPR data controller determination becomes legally pressed. Some level of disclosure follows.

6-12 months: SpaceX's planned IPO (internal valuation target reportedly $1.75T) forces public disclosure of governance terms. Consumer Grok data treatment becomes part of the IPO prospectus, and the boundary becomes auditable.

Bottom Line

What's real: SuperGrok Heavy at $300/month sits inside SpaceX's corporate structure with the consumer data-flow boundary undisclosed.

What to watch: The $99/month introductory offer expires after six months. By then, the data-flow boundary should be public — or its absence will be the answer.

What's next: SpaceX IPO disclosure, or pressure that forces it.

OneHuman's verdict: conditional recommendation with expanded caveats. If you valued Grok's AI-startup posture, the AI-startup-inside-defense-contractor posture is a different product. Same chat interface. Different governance.

Sources

CNBC, February 2026: "Musk's xAI, SpaceX combo is the biggest merger of all time, valued at $1.25 trillion"
Costbench, May 2026: "Grok Pricing 2026 — Full Plan Guide"
The D&O Diary, March 2026: "The SpaceX–xAI Merger"
Basenor, 2026: "xAI Launches Grok Build Beta: Agentic Coding CLI Explained"
AI Tool Analysis, 2026: "SuperGrok Subscription Price 2026"

Verified by OneHuman · May 30, 2026

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Grok Now Costs $300/Month Under SpaceX — The Governance Fine Print No One Is Reading