xAI models

Grok model family. Publishes a release-notes changelog used as the lifecycle and retirement source, with a public migration guide for each retired model slug's replacement.

• Grok 4.6active
• Grok 4.5active
• Grok Build 0.1active
• Grok 4.20 (reasoning)active
• Grok 4.20 (non-reasoning)active
• Grok 4.20 Multi-Agentactive
• Grok 4.1 Fast (reasoning, retired)retired
• Grok 4.1 Fast (non-reasoning, retired)retired
• Grok 4 Fast (reasoning, retired)retired
• Grok 4 Fast (non-reasoning, retired)retired
• Grok 4 (0709, retired)retired
• Grok Code Fast 1 (retired)retired
• Grok 3 (retired)retired

Every fact on these pages is dated and links to a page xAI publishes itself.