AI Reference 071 Modern Model Families Current · Aug 2026 Primary sources linked

The Grok Model Family

Definition

Grok is the model family developed by xAI/SpaceXAI, spanning general reasoning, coding, voice and generative-media systems.

What is Grok?

Grok is the AI model and assistant family created by xAI, now presented under SpaceXAI. The Grok chatbot launched in 2023 and became closely integrated with the X platform while also expanding into standalone apps and APIs.

How the family expanded

xAI released successive generations for reasoning, coding, voice and other workloads. Some earlier Grok weights were released under open or source-available terms, while later frontier products are primarily delivered as hosted services.

Why product and model should be separated

'Grok' can mean the chatbot product or an underlying model generation. The product may add search, tools, memory or platform integrations that are not properties of the raw language model itself.

Related terms, defined

Modern Model Families Grok 4.5 SpaceXAI introduced Grok 4.5 in July 2026 for coding, agentic tasks and knowledge work, then expanded its availability through the company's own products and integrations including GitHub Copilot. Modern Model Families The Mistral Model Family Mistral AI develops commercial and open-weight language models for general generation, coding, multimodal and specialist workloads. Modern Model Families Cohere Command Models Cohere's Command family is designed heavily around enterprise generation, retrieval, tool use and multilingual applications. Cohere's 2026 documentation lists Command A+ as a mixture-of-experts model with text and image input support. Modern Model Families Open, Open-Weight and Closed AI Models AI models differ in what users can inspect and control. Open-weight models make trained parameters available under a license; closed models are typically accessed through hosted products or APIs. Modern Model Families The GPT Model Family GPT is OpenAI's family of generative pretrained transformer models, evolving from research language models into multimodal, reasoning and tool-using systems.

Reference guide and primary sources

Wikipedia is used here as a terminology and history reference guide. Current model versions, institutional statistics and product-specific claims are also linked to first-party or institutional sources because those details can change faster than encyclopedia articles.

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