grok-4-1-fast-reasoning

reasoningdeprecatedproprietary

Context

2M

Input price

$0.2/1M tokens

Output price

$0.5/1M tokens

Capabilities

Show unsupported (2)

Reasoning & Interaction

Reasoning

Tool Calling

Output Control

Structured Output

JSON Mode

Infrastructure

Streaming

Batch Processing

Details

ProviderxAI

Creatorxai

Familygrok-4

Licenseproprietary

Statusdeprecated

Typereasoning

Input modalitiestext, image

Output modalitiestext

Open weightNo

Parameters—

Architecture—

Context window2M tokens

Max input—

Max output—

Reasoning tokensYes

Knowledge cutoff2024-11

Release date2025-11-19

Sourceofficial

Tools

Function Callingfunction_calling

Call external functions and APIs

Pricing

Input

$0.2

Output

$0.5

Cache write

—

Cache read

$0.05

Batch in

—

Batch out

—

Family Comparison: grok-4

Model	Caps	Perf	Speed	Context	Max out	Pricing
grok-4-1-fast-non-reasoning	TJJMSB	—	—	2M	—	$0.2$0.5
grok-4-1-fast-reasoning	RTJJMSB	—	—	2M	—	$0.2$0.5
grok-4-fast-non-reasoning	TJJMSB	—	—	2M	—	$0.2$0.5
grok-4-fast-reasoning	RTJJMSB	—	—	2M	—	$0.2$0.5
grok-4-0709	RTJJMSB	—	—	256K	—	$3$15

API

GET/v1/models/xai/grok-4-1-fast-reasoning