Text Generation Model

Grok 3 Mini Fast

A lightweight, high-speed reasoning model from xAI that delivers fast, intelligent responses with function calling, web search, and extended thinking capabilities.

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Publisher

X.ai

Type Text

Context Window 131,072 tokens

Training Data April 2025

Input $0.60/MTok

Output $4.00/MTok

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About Grok 3 Mini Fast

Fast reasoning with web search and tools

Grok 3 Mini Fast Beta is a compact text generation model developed by xAI, the AI division of X. It belongs to the Grok 3 model family and is designed to deliver faster response times compared to the full Grok 3 models, making it suitable for latency-sensitive applications. The model supports extended thinking, function calling, and real-time web search, and operates with a 131,072-token context window.

Grok 3 Mini Fast Beta is well-suited for developers and businesses building high-throughput applications that require reasoning capability without the overhead of a larger model. Practical use cases include question answering, document summarization, data extraction, and tool-augmented agentic workflows. Its combination of speed, extended context, and tool integration makes it a practical option for production environments where response time is a priority.

Capabilities

What Grok 3 Mini Fast supports

Extended Thinking

Supports step-by-step reasoning before producing a final response, allowing the model to work through multi-step or complex problems more carefully.

Function Calling

Enables the model to invoke external functions and tools, supporting integration into agentic and automated workflows.

Web Search

Allows the model to retrieve real-time information from the web, enabling responses that reflect current events and up-to-date data.

Large Context Window

Handles up to 131,072 tokens in a single session, accommodating long documents, extended conversations, and complex multi-part inputs.

Fast Inference

Optimized for low-latency responses within the Grok 3 family, making it suitable for high-throughput production applications.

Text Generation

Generates coherent, contextually relevant text for tasks including summarization, question answering, and data extraction.

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Performance

Benchmark scores

Scores represent accuracy — the percentage of questions answered correctly on each test.

Benchmark	What it tests	Score
MMLU-Pro	Expert knowledge across 14 academic disciplines	82.8%
GPQA Diamond	PhD-level science questions (biology, physics, chemistry)	79.1%
MATH-500	Undergraduate and competition-level math problems	99.2%
AIME 2024	American math olympiad problems	93.3%
LiveCodeBench	Real-world coding tasks from recent competitions	69.6%
HLE	Questions that challenge frontier models across many domains	11.1%
SciCode	Scientific research coding and numerical methods	40.6%

FAQ

Common questions about Grok 3 Mini Fast

What is the context window size for Grok 3 Mini Fast Beta?

Grok 3 Mini Fast Beta supports a context window of 131,072 tokens, allowing it to process long documents and extended multi-turn conversations in a single session.

Where can I find pricing information for this model?

Pricing details are available on the xAI Models and Pricing page at https://docs.x.ai/developers/models.

What is the training data cutoff for Grok 3 Mini Fast Beta?

Based on available metadata, the model's training data has a cutoff of April 2025.

Does Grok 3 Mini Fast Beta support function calling and tool use?

Yes, the model supports function calling, enabling developers to integrate it into agentic workflows where it can invoke external tools and APIs.

How does Grok 3 Mini Fast Beta differ from other Grok 3 models?

Grok 3 Mini Fast Beta is a smaller, faster variant within the Grok 3 family, prioritizing lower latency and efficiency while retaining reasoning capabilities such as extended thinking and web search.

Resources