ModelTreeAI Model Lineage
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Model creator

xAI

The creator of the Grok models, served through a hosted API with no downloadable weights. Its own surfaces do not agree on one name: x.ai titles its news pages "SpaceXAI" and carries the footer "© 2026 SpaceXAI LLC", while the developer documentation on docs.x.ai describes the same models as "SpaceXAI’s frontier model" and the interface as "the xAI API". Both names are first-party and nothing checked on either site states a rename, so both are recorded and neither is asserted to have replaced the other.

1 familyChecked Aug 28, 2026
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Recorded lineage, creator by creator

Nesting shows a recorded predecessor Model Passport
CreatorxAIThe creator of the Grok models, served through a hosted API with no downloadable weights. Its own surfaces do not agree on one name: x.ai titles its news pages "SpaceXAI" and carries the footer "© 2026 SpaceXAI LLC", while the developer documentation on docs.x.ai describes the same models as "SpaceXAI’s frontier model" and the interface as "the xAI API". Both names are first-party and nothing checked on either site states a rename, so both are recorded and neither is asserted to have replaced the other.
Family

Grok 4

First released Jul 9, 2025

1 recorded lineage link in this family.

No creator statement of what this variant name means is recorded for Grok 4.

Families without a featured release are not drawn here. Every record in the catalog, featured or not, is listed in the model index and the Model Tree.

Official record

The organization's own surfaces, and the verification date these facts were last checked against them.

Full recorded name
SpaceXAI
Website
https://x.ai
Release page
https://x.ai/news
Type
company
Verified
Aug 28, 2026

Releases

Every release recorded for xAI, current and legacy alike. Filter by lifecycle status; the choice is kept in the page address so it survives a reload or a shared link.

Showing all 2 releases.

  • Grok 4.6 Available

    Grok 4Standard Aug 12, 2026 Hosted API

  • Grok 4.5 Available

    Grok 4Standard Jul 16, 2026 Hosted API

Primary sources

The organization-level sources behind the summary above.