Model family timeline
Last updated Jul 9, 2025
Grok model releases
A source-backed timeline for the Grok model family, collecting release dates, labs, access details, context windows, and major lifecycle changes.
5
Models
1
Labs
1
Open
4
Recent
Most recent in this set
5 models
Grok 4
DeprecatedxAIProprietary
xAI's fourth-generation Grok line, preceding the later 4.x API updates already tracked in the catalog.
Type
—
Params
Undisc.
Context
—
Top eval
—
Released
Jul 9, 2025
12mo ago
—Undisc.— ctxJul 9, 2025
Grok 3
DeprecatedxAIProprietary
xAI's third-generation model family, introduced with stronger reasoning, search, and coding modes.
Type
—
Params
Undisc.
Context
—
Top eval
—
Released
Feb 17, 2025
1.3y ago
—Undisc.— ctxFeb 17, 2025
Grok-2
RetiredxAIProprietary
Second-generation Grok release with Grok-2 and Grok-2 mini for chat, coding, reasoning, and image-enabled product experiences.
Type
—
Params
Undisc.
Context
—
Top eval
—
Released
Aug 13, 2024
1.9y ago
—Undisc.— ctxAug 13, 2024
Grok-1.5
RetiredxAIProprietary
Grok update with stronger reasoning and a 128K context window.
Type
—
Params
Undisc.
Context
128K
Top eval
—
Released
Mar 28, 2024
2.2y ago
—Undisc.128K ctxMar 28, 2024
Grok-1
AvailablexAIOpen source
xAI's first Grok model, later released as open weights with a 314B-parameter MoE checkpoint.
Type
MoE
Params
314B
Context
—
Top eval
—
Released
Nov 4, 2023
2.6y ago
MoE314B— ctxNov 4, 2023