retired

Grok 4.1 Fast (Reasoning)

xai/grok-4-1-fast-reasoning

Prices

Input: $1.25 per 1M tokens
unverified · disputed
Input (>200k ctx): $2.50 per 1M tokens
low
Input (cached read, >200k ctx): $0.40 per 1M tokens
low
Input (cached read): $0.20 per 1M tokens
unverified · disputed
Output: $2.50 per 1M tokens
unverified · disputed
Output (>200k ctx): $5.00 per 1M tokens
low

Also available on

The same model, sold by someone else. The price above is the maker's own.

6 sales channels for this model.
Channel	What	Price
Google Vertex AI	Input	$0.20 per 1M tokens
	Input (cached read)	$0.05 per 1M tokens
	Output	$0.50 per 1M tokens
Google Vertex AI · vertex-ai	Input	$0.20 per 1M tokens
	Input (cached read)	$0.05 per 1M tokens
	Output	$0.50 per 1M tokens
Microsoft Azure	Input	$0.20 per 1M tokens
	Input (cached read)	$0.05 per 1M tokens
	Output	$0.50 per 1M tokens
Microsoft Azure · azure-ai	Input	$0.20 per 1M tokens
	Output	$0.50 per 1M tokens
Other · google-vertex	Input	$0.20 per 1M tokens
	Input (cached read)	$0.05 per 1M tokens
	Output	$0.50 per 1M tokens
Other · vercel	Input	$0.20 per 1M tokens
	Input (cached read)	$0.05 per 1M tokens
	Output	$0.50 per 1M tokens

Specifications

Provider: xai
Context window: 128,000
Max output tokens: 128,000
Open weights: no
Released: 11/19/2025
Retires: 05/15/2026
First seen by this tracker: 09/14/2026

Price history

Input — per 1M tokens

Recorded changes for Input
From	Amount
09/14/2026	0.2
09/14/2026	1.25

Input (cached read) — per 1M tokens

Recorded changes for Input (cached read)
From	Amount
09/14/2026	0.05
09/14/2026	0.2

Output — per 1M tokens

Recorded changes for Output
From	Amount
09/14/2026	0.5
09/14/2026	2.5

No changes recorded

Input (>200k ctx): 2.5 per 1M tokens, unchanged since 09/14/2026
Output (>200k ctx): 5 per 1M tokens, unchanged since 09/14/2026
Input (cached read, >200k ctx): 0.4 per 1M tokens, unchanged since 09/14/2026

Last updated 10/04/2026, 02:10