/

Model Versions

1 min read

Grok model evolution

Grok 1

Nov 2023

xAI's first model, initial release

Grok 1.5

Mar 2024

Improved capabilities, still not frontier competitive

Grok 2

Aug 2024

Significant upgrade, laying groundwork for Grok 3

Grok 3

Feb 2025

Breakthrough model with DeepSearch and Think mode. Competitive benchmarks.

Grok 4

Jul 2025

Integrated reasoning, multi agent Heavy variant

Grok 4.1

Nov 2025

Refined personality and usability. Preferred 64%+ of the time over Grok 4.

Grok 1

Nov 2023

xAI's first model, initial release

Grok 1.5

Mar 2024

Improved capabilities, still not frontier competitive

Grok 2

Aug 2024

Significant upgrade, laying groundwork for Grok 3

Grok 3

Feb 2025

Breakthrough model with DeepSearch and Think mode. Competitive benchmarks.

Grok 4

Jul 2025

Integrated reasoning, multi agent Heavy variant

Grok 4.1

Nov 2025

Refined personality and usability. Preferred 64%+ of the time over Grok 4.

0%

User preference for Grok 4.1 over Grok 4

0K

Token context (SuperGrok)

0K+

Token context (SuperGrok Heavy)

Grok 4 Fast: unified reasoning

Grok 4 Fast uses a unified architecture where reasoning depth is controlled via system prompts. It handles both quick and deep responses with the same model weights, eliminating the need to choose between speed and quality.