Category: xAI models

This category contains 8 pages.

• Grok (model family) · xAI's model line, distributed through the X platform; known for rapid scaling on the Colossus cluster and a lighter-refusal posture.
• Grok 3 · xAI's February 2025 flagship model, trained on the Colossus supercluster and released with a dedicated reasoning mode and the DeepSearch agent.
• Grok 4 · xAI's July 2025 flagship reasoning model, trained with large-scale reinforcement learning and released alongside a multi-agent Grok 4 Heavy variant.
• Grok 4.1 · xAI's November 2025 update to Grok 4, focused on emotional intelligence, creative writing, and reduced hallucinations, with a developer-reported first place on the LMArena text leaderboard at launch.
• Grok 4.5 · xAI's July 2026 frontier model, pitched as an efficient coding and agentic workhorse with configurable reasoning effort.
• Grok-1 · xAI's first model (November 2023); its March 2024 open-weights drop, a 314B MoE under Apache 2.0, was then the largest open release.
• Grok-1.5 · xAI's March 2024 successor to Grok-1, adding a 128,000-token context window and developer-reported gains in math and coding.
• Grok-2 · xAI's August 2024 frontier chatbot model, released in beta on the X platform alongside a smaller Grok-2 mini variant.