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Grok 2 Vision (grok-2-vision-1212) is a multimodal language model developed by xAI and released in December 2024. It accepts combined image and text inputs and is designed to understand, analyze, and respond to visual content alongside natural language. The model supports images up to 20MiB in JPG, JPEG, or PNG format and can process inputs in any order. It also includes multilingual support and improved instruction-following compared to earlier Grok vision releases.

Grok 3 is the flagship large language model from xAI, developed and released in February 2025. It was built from the ground up in approximately one year and is designed to handle demanding tasks including advanced reasoning, coding, and creative writing. The model is available via API under the identifier grok-3-latest and supports a context window of 131,072 tokens. It includes a dedicated Thinking mode that enables multi-step reasoning on complex problems.

Grok 3 Fast is a performance-optimized variant of xAI's Grok 3 model, released in April 2025 as part of the Grok 3 family. It is designed to deliver faster response times compared to the standard Grok 3 Beta while retaining the same core language understanding, function calling, and web search capabilities. The model supports a 131,072-token context window, making it capable of handling long documents and extended multi-turn conversations.

Grok 3 Mini Beta is a compact text generation model developed by xAI, the AI division of X. It is designed as a thinking model, meaning it reasons through problems step by step before producing a final answer, and it exposes that reasoning trace so users can follow the model's logic in full. The model supports adjustable reasoning effort, defaulting to a lower setting for speed but allowing a high-effort mode for more demanding problems. It has a 131,072-token context window and was trained with data up to April 2025.