Model release

Grok 2

Grok 2 is an open-weight model release in the Grok family from xAI (SpaceXSI)1 2, version Grok 2, released Aug 2025. Its weights can be downloaded by the public1 2 under the xAI Community License Agreement2 1.

Grok 2 is a post-trained language model that xAI trained and used in 2024; its weights, about 500 GB in 42 files, were published on Hugging Face in August 2025. Press coverage at the time reported the release as Grok 2.5.1 3

On AI on Hugging Face: xai-org/grok-2

Last reviewedSep 29, 2026Entry updated Oct 11, 2026Documented release Aug 2025

Availability and license

Overall availability

Public

Downloadable from Hugging Face without gating; use is governed by the xAI Community License Agreement, which conditions commercial use on following xAI's Acceptable Use Policy and bars using the materials or outputs to train other general-purpose models.1 2

Availability fact review: not separately recorded

Availability is separate from permission: read the license before using or redistributing.

xAI Community License Agreement (external site: huggingface.co)2 1
Applies to: Everything in the release · custom license (no SPDX identifier) · fact-level rights review not recorded
Plain-language guide to the xAI Community License Agreement

The model card calls it the "Grok 2 Community License Agreement", but the LICENSE file is titled xAI Community License Agreement (last updated November 4, 2025). It grants a revocable license for non-commercial and research use, and allows commercial use only if users follow xAI's Acceptable Use Policy. It forbids using the materials or their outputs to train or improve other foundation, large language, or general-purpose models (fine-tuning Grok 2 itself is allowed), requires "Powered by xAI" attribution when distributing, ends if the licensee brings certain IP lawsuits, and is governed by Texas law.2 1

Component reuse rights

A readable or downloadable component is not automatically reusable. These indicators concern recorded license evidence, not system certification.

weights: Unknown — no complete fact-level rights review
code: Unknown — no complete fact-level rights review
data: Unknown — no complete fact-level rights review
documentation: Unknown — no complete fact-level rights review

No complete system-rights review is recorded for this release.

Model-disclosure tier

Computed from the checklist below using USASI rubric v0.2. An editorial category, not a certification.

Open-weight

The model parameters for this release can be downloaded by the public. License terms may still restrict use, redistribution, or commercial use.

The weights are under a license that is not on the rubric's OSI-approved list. Read its terms before use.

How tiers are computed

Public materials checklist

Items for a model under USASI rubric v0.2. Unknown means unassessed or insufficient evidence.

Public materials checklist for Grok 2
Item	Status	Notes and evidence
WeightsCan the general public download the model parameters for this release?	Public	Public download under a custom license with use restrictions.1 2
Inference codeIs code for running the model published?	Public	Serving is documented through the open-source SGLang engine (v0.5.1 or later); the xAI repository holds weights, config, and tokenizer but no inference code of its own.1
Training codeIs the code used to train the model published?	Unknown	Not assessed.
Training-data informationDoes the information cover provenance, scope, acquisition, selection, labeling, processing, and where data or alternatives can be obtained? Access alone does not establish completeness.	Unknown	Not assessed.
Training-data accessCan the training data be obtained? This is independent of information completeness and reuse rights; original unshareable data need not be downloadable.	Unknown	Not assessed.
Complete training pipelineIs the complete base-training and preprocessing pipeline published, including configuration? Fine-tuning code or an inference SDK alone is insufficient.	Unknown	Not assessed.
Legacy data assessment (v0.1)Historical assessment combining download access and disclosure. Preserved for traceability; excluded from the v0.2 tier calculation. See the new separate assessments above.	Unknown	Not assessed.
Training recipeAre the training configuration and procedure documented in enough detail to follow?	Unknown	Not assessed.
Evaluation materialsPublic = evaluation code or prompts that let others re-run the evaluations are published. Partial = results only.	Unknown	Not assessed.

Run and use notes

Documented facts only. No hardware or performance claims are made without a cited source and stated assumptions.

The model card documents serving with SGLang using tensor parallelism across 8 GPUs, each with more than 40GB of memory; the documented launch command uses fp8 quantization and the Triton attention backend.1
The model card says this is a post-trained model and that requests need the correct chat template.1

Organization context

xAI (SpaceXSI)

Other releases in the Grok family

Grok-1Model-disclosure tier (USASI rubric v0.2): Open-weight

Grok family overview

What this catalog does not know

Unknown means the sources reviewed for this record do not document it. It is not evidence that something does not exist.

Training code: unknown.
Training-data information: unknown.
Training-data access: unknown.
Complete training pipeline: unknown.
Legacy data assessment (v0.1): unknown.
Training recipe: unknown.
Evaluation materials: unknown.

Have a primary source? How to report a correction.

U.S. eligibility

Project eligibility rests on documented governing or maintaining entities, not on contributors.

Eligible · basis: U.S. headquarters

Developed by xAI, whose AI operations are headquartered in Palo Alto, California, according to the June 2026 prospectus of its parent, Space Exploration Technologies Corp., a Texas corporation. The license names X.AI LLC as licensor.4 2

Assessed Sep 29, 2026

Sources

1.
xai-org/grok-2 (external site: huggingface.co)
xAI (Hugging Face) · Model card · accessed Sep 29, 2026
2.
xAI Community License Agreement (xai-org/grok-2 LICENSE) (external site: huggingface.co)
xAI (Hugging Face) · License · published Nov 4, 2025 · accessed Sep 29, 2026
3.
Elon Musk says xAI has open sourced Grok 2.5 (external site: techcrunch.com)
TechCrunch · News report · published Aug 24, 2025 · accessed Sep 29, 2026
4.
Space Exploration Technologies Corp. final prospectus (Rule 424(b)(4)) (external site: sec.gov)
U.S. Securities and Exchange Commission (SpaceX filing) · Filing · published Jun 12, 2026 · accessed Sep 29, 2026

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This listing is not an endorsement, a safety assessment, or a federal approval.

Cite this page

APA style

USASI. (2026, October 11). Grok 2. United States of America Superintelligence. https://unitedstatesofamericasuperintelligence.com/open/grok-2/

BibTeX

@misc{usasi_grok_2,
  author = {{USASI}},
  title = {Grok 2},
  year = {2026},
  month = oct,
  howpublished = {\url{https://unitedstatesofamericasuperintelligence.com/open/grok-2/}},
  note = {United States of America Superintelligence. Last updated 2026-10-11}
}

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