# Grok 4

Grok 4 is an AI model released by SpaceXAI on Jul 9 2025.

## Facts

| Field | Value |
| --- | --- |
| Model | Grok 4 |
| Developer | SpaceXAI |
| Release date | Wednesday, Jul 9 2025 |
| Licensing | Proprietary |

## About Grok 4

Grok 4, released July 9, 2025, was xAI's reasoning-first flagship, trained with large-scale reinforcement learning on the Colossus cluster. It launched with claims of leading scores on Humanity's Last Exam and ARC-AGI-2, and shipped alongside Grok 4 Heavy, a multi-agent variant that runs several instances in parallel and compares their answers.

The launch cemented xAI's pattern of aggressive benchmark competition and rapid iteration: Grok 4 Fast followed in September 2025, the coding-focused Grok Code Fast 1 in August, and Grok 4.1 in November 2025. The line continued with Grok 4.5 in July 2026 and Grok 4.6 in August 2026.

## Questions and answers

### When was Grok 4 released?

Grok 4 was released by SpaceXAI on Wednesday, Jul 9 2025.

### Who made Grok 4?

Grok 4 was built by SpaceXAI. Elon Musk's AI company building the Grok series of models. Founded in 2023 as xAI, now part of SpaceX. Cursor (Anysphere) and its Composer coding models were acquired in 2026 and are tracked here.

### Is Grok 4 open source?

No. Grok 4 is a proprietary model. The weights are not published — it is available only through the provider's own API, apps, or partner platforms.

### What came before and after Grok 4?

SpaceXAI's previous tracked release was Grok 3 mini on Feb 17 2025, 142 days earlier. It was followed by Grok 4 Heavy on Jul 9 2025.


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Canonical page: https://aireleasetracker.com/model/xai/grok-4
Full dataset: https://aireleasetracker.com/llms-full.txt · JSON: https://aireleasetracker.com/models.json
Source: AI Release Tracker (https://aireleasetracker.com). Benchmark scores are the figures published by the releasing lab at launch.