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Sourced model record · Catalog current through July 21, 2026

Grok 4 Heavy

A reviewed catalog record from xAI, released July 10, 2025. This page reports only what named sources publish about this exact record, with receipts.

UnreleasedClosed weightsLanguage

What the evidence says

Developer
xAI
Released
July 10, 2025
Domains
Language
Tasks
Language modeling/generation · Question answering · Mathematical reasoning · Quantitative reasoning · Code generation
Access
Unreleased
Weights
Closed weights

Common questions

What is Grok 4 Heavy?

Grok 4 Heavy is a xAI model released July 10, 2025, according to Epoch AI's reviewed catalog record. The record classifies it under language.

How does Grok 4 Heavy rank on LMArena?

No board Model Gauntlet mirrors currently lists this exact model revision under a reviewed identity, so no rating is reported here.

What does Grok 4 Heavy cost?

No reviewed source carries pricing for this record, so no price is reported here.