Grok 4.1 Fast

xAI • grok-4-1-fast

Model Information

Slug	grok-4-1-fast
LLM.txt	View
Release Date	November 19, 2025

Organization

Name	xAI
Website	https://x.ai/

Model Description

Grok 4.1 Fast is xAI's best agentic tool calling model that shines in real-world use cases like customer support and deep research. 2M context window.

Reasoning can be enabled/disabled using the `reasoning` `enabled` parameter in the API. [Learn more in our docs](https://openrouter.ai/docs/use-cases/reasoning-tokens#controlling-reasoning-tokens)

Available at 19 Providers

Provider	Type	Model Name	Original Model	Input ($/1M)	Output ($/1M)	Actions
Routeway		xAI: Grok 4.1 Fast	`grok-4.1-fast`	$0.19	$0.48	Model
FastRouter		xAI: Grok 4.1 Fast	`x-ai/grok-4.1-fast`	$0.20	$0.50	Model
xAI		Grok 4.1 Fast	`grok-4-1-fast`	$0.20	$0.50	Visit
OpenRouter	Chat Code	Grok 4.1 Fast	`x-ai/grok-4.1-fast`	$0.20	$0.50	Model
ZenMUX		xAI: Grok 4.1 Fast	`x-ai/grok-4.1-fast`	$0.20	$0.50	Visit
Kilo Code	Code	xAI: Grok 4.1 Fast	`x-ai/grok-4.1-fast`	$0.20	$0.50	Visit
RedPill		xAI: Grok 4.1 Fast	`grok-4.1-fast`	$0.20	$0.50	Visit
WaveSpeed AI	Chat Code	grok-4.1-fast	`x-ai/grok-4.1-fast`	$0.22	$0.55	Visit
Venice		Grok 4.1 Fast	`grok-41-fast`	$0.50	$1.25	Visit
Nano-GPT		Grok 4.1 Fast	`x-ai/grok-4.1-fast`	-	-	Visit
ValorGPT		Grok 4.1 Fast	`x-ai-grok-4.1-fast`	-	-	Model
JetBrains AI	Code	Grok-4.1 Fast	`Grok-4.1 Fast`	-	-	Model
RouterLink		Grok 4.1 Fast	`Grok 4.1 Fast`	-	-	Visit
Blackbox AI	Code	blackboxai/x-ai/grok-4.1-fast	`blackboxai/x-ai/grok-4.1-fast`	-	-	Visit
Qiniu		x-AI/Grok-4.1-Fast	`x-ai/grok-4.1-fast`	-	-	Visit
LangDB		grok-4.1-fast	`grok-4.1-fast`	-	-	Model
ApiYI	Chat Code	grok-4-1-fast	`grok-4-1-fast`	-	-	Visit
Airforce API		grok-4.1-fast	`grok-4.1-fast`	-	-	Visit
Writingmate	Chat Code	xAI: Grok 4.1 Fast	`x-ai/grok-4.1-fast`	-	-	Model

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