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Grok 4.1 Fast

Parameters

Undisclosed

Context Length

128K

Modality

Text

Architecture

Undisclosed

License

Proprietary

Release Date

1 Jun 2025

Knowledge Cutoff

Jun 2025

API Pricing (per 1M)

Input: $1.25 · Output: $2.50

Evaluation Benchmarks

Rank

#142

BenchmarkScoreRank

General Text

Text Arena
auto

1430

81

Web Development

WebDev Arena
auto

1240

100

Intelligence Index

Artificial Analysis

0.11

185

Rankings

Overall Rank

#142

Coding Rank

#136

About Grok 4.1 Fast

Grok 4.1 Fast is a high-throughput reasoning model from xAI engineered for low-latency agentic workflows and real-time data grounding. It supports multihop web search, tool execution, and dual thinking modes across a 2M token context window.

Technical Specifications

Architecture specifications are undisclosed for proprietary models.

About Grok 4

xAI's frontier intelligence models trained with reinforcement learning at unprecedented scale using the 200,000 GPU Colossus cluster. Grok 4 series demonstrates state-of-the-art performance in reasoning, coding, and multimodal understanding with native tool use capabilities. Features real-time search integration across X and the web, advanced reasoning through scaled RL training, and industry-leading performance on academic benchmarks. Designed for both immediate responses and extended thinking modes with vision capabilities.


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