Grok 4.1 Fast

Name: Grok 4.1 Fast
Author: xAI

GrokvFastDeprecated

xAI(ai lab)

Released November 19, 2025

Deprecated May 15, 2026

Run this model yourself API Docs Playground

Context2M tokens

Price (In / Out)$0.20/M / $0.50/M

CategoryMultimodal LLM

Max Output30K tokens

About Grok 4.1 Fast

Grok 4.1 Fast is a multimodal llm from xAI. Supports up to 2,000,000 token context window. Available from $0.20/M input tokens.

Capabilities

textvisioncode

Input Modalities

textimagefile

Output Modalities

text

Technical Details

API Identifier: x-ai/grok-4.1-fast
Category: Multimodal LLM
Context Window: 2,000,000 tokens
Max Output Tokens: 30,000 tokens

Run this model yourself

Local and cloud setup for Grok 4.1 Fast, with exact configurations, sources and clear evidence limits.

Find a model for your hardware

No reviewed setup guide is available for this model yet. Explore configurations with documented support in the hardware finder.

Benchmarks

Performance scores for Grok 4.1 Fast across standard benchmarks.

GPQA DiamondArtificial Analysis

63.7%

AIME 2025Artificial Analysis

34.3%

Pricing

Token pricing for Grok 4.1 Fast API usage.

Input Tokens

$0.20/M

per million tokens

Output Tokens

$0.50/M

per million tokens

Cache read: $0.0500/M tokens

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AI Models by xAI

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Model	Context Window	Price (In / Out per M)	Capabilities
Grok 4.7Current	500K	$2.00 / $6.00	codingreasoningvisiontool use+3
Grok 4.20 Multi-AgentCurrent	2.0M	$2.00 / $6.00	textvisioncode
Grok 4.20Current	2.0M	$2.00 / $6.00	textvisioncode
Grok 4 FastDeprecated	2.0M	Deprecated	textvisioncode