LLM Releases

Model family timeline

Last updated Aug 8, 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.

6
Models
1
Labs
1
Open
4
Recent
All models·Latest releases·Coding models·Reasoning models·Changelog

Most recent in this set

Aug 8, 2025

Grok 5

xAI

Jul 9, 2025

Grok 4

xAI

Feb 17, 2025

Grok 3

xAI

Aug 13, 2024

Grok-2

xAI

6 models

Grok 5

Rumored
xAIFrontierProprietary

Rumored next major Grok model. Elon Musk said after GPT-5's launch that Grok 5 would arrive before the end of 2025, but no broad public Grok 5 release is logged in this catalog yet.

—Undisc.— ctxAug 8, 2025

Grok 4

Deprecated
xAIProprietary

xAI's fourth-generation Grok line, preceding the later 4.x API updates already tracked in the catalog.

—Undisc.— ctxJul 9, 2025

Grok 3

Deprecated
xAIProprietary

xAI's third-generation model family, introduced with stronger reasoning, search, and coding modes.

—Undisc.— ctxFeb 17, 2025

Grok-2

Retired
xAIProprietary

Second-generation Grok release with Grok-2 and Grok-2 mini for chat, coding, reasoning, and image-enabled product experiences.

—Undisc.— ctxAug 13, 2024

Grok-1.5

Retired
xAIProprietary

Grok update with stronger reasoning and a 128K context window.

—Undisc.128K ctxMar 28, 2024

Grok-1

Available
xAIOpen source

xAI's first Grok model, later released as open weights with a 314B-parameter MoE checkpoint.

MoE314B— ctxNov 4, 2023