Release timeline
When each model was first publicly available.
Grok 3 LatestFeb 17, 2025
Grok 3 Fast LatestFeb 17, 2025
Grok 4 LatestJul 9, 2025
Grok 4 0709Jul 9, 2025
Grok Code Fast 1Aug 28, 2025
Grok 4 Fast ReasoningSep 19, 2025
Grok 4 Fast Non ReasoningSep 19, 2025
Grok 4.1 Fast ReasoningNov 19, 2025
Grok 4.1 Fast Non ReasoningNov 19, 2025
Grok 4.20 0309 ReasoningMar 10, 2026
Grok 4.20 0309 Non ReasoningMar 10, 2026
Grok 4.20 Multi Agent 0309Mar 10, 2026
Frequently asked questions
Sim currently tracks 12 xAI models including Grok 4 Latest, Grok 4 0709, Grok 4.1 Fast Reasoning, Grok 4.1 Fast Non Reasoning, Grok 4 Fast Reasoning, Grok 4 Fast Non Reasoning, and more.