xAI Grok 4 at a glance
Grok 4 was trained with reinforcement learning at pretraining scale to use tools such as code and search, launched in the API with a 256K context window, and came with a new SuperGrok Heavy tier.
What changed with xAI Grok 4
On July 9, 2025, xAI released Grok 4 to SuperGrok and Premium+ subscribers and through the xAI API. xAI said it used its 200,000-GPU Colossus cluster to run reinforcement learning at pretraining scale, teaching the model to reach for a code interpreter, web browsing and deep X search when needed.
xAI also introduced Grok 4 Heavy, which uses parallel test-time compute to consider several hypotheses at once, available through a new SuperGrok Heavy subscription. It reported 15.9% on ARC-AGI-2 for Grok 4, a new high for closed models at the time by its account, and the API offered a 256,000 token context window with text and vision input.
xAI Grok 4 in numbers
Values are copied from the linked source on the date shown. They are not IA Compa measurements.
- Context windowas of · Source for Context window: x.ai (opens in a new tab)
- 256K tokens
How it compares
Models that were current when this was published (released in the six months before it, newest version of each line), so these figures are from that time. Under each chart is the current best. (Models)
Current best (as of Nov 6, 2026): GPT-6 Cyber, 1.05M tokens
Where to compare xAI Grok 4
Independent leaderboards and official resources for comparing this model yourself. Rankings change often; each site shows its own current data.
General leaderboards
Official resources
Why xAI Grok 4 matters for businesses
For businesses, Grok 4 added a strong tool-using model with real-time search across X and the web, which can help with market monitoring or social listening, but teams should validate its vendor-reported results and content policies against their own use cases.
Sources for this story
- Grok 4 (opens in a new tab)Official
xAI · x.ai
- Grok 4 model page (opens in a new tab)Benchmark
Artificial Analysis · artificialanalysis.ai
Last verified: . IA Compa summarizes public announcements for business readers. We are not affiliated with the companies mentioned. Always confirm details, pricing, and availability with the official source.
- #llm
- #xai
- #grok
- #reasoning
- #tool-use
