Grok AI Available Models: All Supported Models, Version Differences, Capabilities Comparison, And Access Requirements
- Michele Stefanelli
- 8 hours ago
- 4 min read
Grok AI offers a broad lineup of models for both consumer users and developers, with distinct capabilities, context windows, and access tiers. Model selection is available through the Grok consumer app, the model picker on X, and the xAI API, each supporting different workflows and subscription levels.
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Grok AI Models Are Available Across Consumer Apps And The xAI API.
Grok AI’s ecosystem includes a range of models accessible via grok.com, the X platform, mobile apps, and the xAI API. In the consumer experience, users can choose from models such as Grok 4.1 and, in higher tiers, Grok 4 Heavy. The xAI API provides a more granular catalog with models tailored for reasoning, speed, tool-calling, coding, and image generation.
Both the consumer picker and the API offer recent and legacy models, letting users or developers select the optimal model for their needs.
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Grok AI Model Catalog And Surfaces
Model Name | Where Available | Primary Use Case |
Grok 4.1 | Consumer apps, X, API | Advanced reasoning, conversation |
Grok 4 Heavy | SuperGrok Heavy (higher tier) | Enhanced performance, reliability |
Grok 4 | API, SuperGrok, Premium+ | Frontier reasoning, tools |
Grok 4 Fast (reasoning/non-reasoning) | API | Speed-optimized, agentic tasks |
Grok 4.1 Fast (reasoning/non-reasoning) | API | Fast agentic tool-calling |
Grok Code Fast 1 | API | Agentic coding |
Grok 3, Grok 3 Mini | API | Legacy general models |
Grok 2 Vision, Grok Vision Beta | API | Vision tasks, legacy support |
Grok 2 Image | API | Text-to-image generation |
Grok Beta | API | Early access, experiments |
Selection depends on access level and product surface.
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Version Differences Reflect Reasoning, Speed, Tool Use, And Specialized Skills.
Grok AI’s model lineup is divided by specialization and context window. Grok 4 and Grok 4.1 are positioned as advanced reasoning models, with Grok 4.1 offering improved usability and conversation quality. Grok 4 Heavy is a premium variant focused on reliability and parallel compute.
The “Fast” families—Grok 4 Fast and Grok 4.1 Fast—split into reasoning and non-reasoning modes, designed to optimize for low latency and cost efficiency. Fast agentic models are optimized for rapid tool-calling and workflow integration.
Specialized models include Grok Code Fast 1, focused on agentic coding, and Grok 2 Image, which enables text-to-image generation. Legacy models such as Grok 3 and Grok Vision Beta remain available for compatibility and migration support.
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Grok AI Model Version And Capability Differences
Model Family | Reasoning Mode | Tool Calling | Context Window | Specialty |
Grok 4, 4.1 | Reasoning | Yes | 256K | General, advanced |
Grok 4 Heavy | Reasoning | Yes | Separate tier | High reliability |
Grok 4 Fast | Reasoning/Non-reasoning | Yes | 2M | Fast inference |
Grok 4.1 Fast | Reasoning/Non-reasoning | Yes | 2M | Fast, agentic |
Grok Code Fast 1 | Reasoning | Yes | 256K | Coding |
Grok 2 Vision/Image | Vision/Image | Partial | 131K | Vision, image gen |
Grok 3 series | Reasoning | Partial | Legacy | Migration, basic |
Speed, reasoning, and specialty drive model choice.
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Capabilities Comparison Spans Frontier Reasoning, Fast Agentic Workflows, And Specialized Tasks.
The core Grok 4 models offer high-capability reasoning, tool use, and real-time search, suitable for complex conversation, problem-solving, and research. Fast variants support rapid agentic workflows, optimizing for speed and cost where inference time matters.
Grok Code Fast 1 specializes in code generation and automation, while Grok 2 Image and Vision models handle text-to-image and vision-based tasks. Earlier Grok models remain available to support legacy applications and users seeking migration stability.
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Grok AI Capabilities Comparison
Capability | Grok 4/4.1 | Grok 4 Fast | Grok 4.1 Fast | Code Fast | 2 Vision/Image | 3 Series |
Reasoning | Strong | Configurable | Configurable | Moderate | No | Moderate |
Tool use | Yes | Yes | Yes | Yes | Limited | Partial |
Speed | Standard | High | Highest | High | Standard | Legacy |
Coding | Good | Good | Good | Strongest | No | Moderate |
Vision/image | No | No | No | No | Yes | Yes (vision beta) |
Context window | 256K | 2M | 2M | 256K | 131K | Legacy |
Model selection matches workflow and capability needs.
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Access Requirements Are Defined By Plan, API Key, And Surface.
Consumer users access Grok 4.1 and Auto mode directly in grok.com, the X platform, and mobile apps, with Grok 4 available to SuperGrok and Premium+ subscribers. Grok 4 Heavy is reserved for SuperGrok Heavy subscribers, reflecting a higher-performance tier.
Developers obtain access through the xAI API by registering for an API key, with model use billed by context window and request volume. The API model list specifies available models, context caps, and usage policies.
Legacy models remain in the API selector to support ongoing application needs and migration from older xAI systems.
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Grok AI Access Requirements By Model And Surface
Model | Consumer App | API | Subscription Needed |
Grok 4.1 | Yes | Yes | Standard |
Grok 4 | Premium+ / SuperGrok | Yes | Paid |
Grok 4 Heavy | SuperGrok Heavy | Not standard | Highest tier |
Fast models | No | Yes | API key |
Specialized/coding | No | Yes | API key |
Vision/Image/Legacy | No | Yes | API key |
Subscription level and API access define model availability.
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Grok AI’s Model Lineup Offers Reasoning, Speed, And Specialization For Both Consumers And Developers.
Grok AI maintains a dynamic catalog of models tailored to reasoning, speed, coding, vision, and agentic workflows. Access varies by subscription plan, surface, and developer credentials, giving users and organizations flexibility in matching models to their application and conversation needs.
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