xAI · Grok (xAI)
Grok 4 Heavy
ActivePremium maximum multi-agent reasoning tier for the hardest multi-step problems; enterprise/contact pricing.
About this version
Grok 4 Heavy is an active, premium-tier model in the grok family released in July 2025, positioned for high‑capacity multi‑agent reasoning on complex, multi‑step problems and offered under enterprise or contact pricing. It provides a 256 000‑token context window and represents the most capable reasoning tier within its series.
- API string
- grok-4-heavy
- Context window
- 256K ctx
- Tier
- Reasoning
- Released
- Jul 1, 2025
Release & change timeline
No dated events logged for this version yet.
Patches, price changes, benchmarks, and deprecations for Grok 4 Heavy will appear here as they’re recorded. Follow the broader Catch Me Up digest in the meantime.
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Part of the Grok (xAI) version timeline. Catch Me Up — everything that changed across AI & smart home ↗