Model

Grok 4.1 Fast (Reasoning)

Name: Grok 4.1 Fast (Reasoning)
Brand: xai

xAI's fast agentic tool-calling model with a 2M context window and built-in reasoning

8 providers · 8 listingsreleased Nov 19, 2025closed weights

$0.18

lowest input /M · Jiekou.AI

$0.45

lowest output /M · Jiekou.AI

context window

max output

Compare providers (sorted by listed input price)

6 of 8 providers publish a price for Grok 4.1 Fast (Reasoning). The cheapest full-context option is Jiekou.AI at $0.18/$0.45 per M.

			Cache read /M	Cache write /M		Capabilities	Status
Jiekou.AI grok-4-1-fast-reasoning	$0.18	$0.45	—	—	2M	no reasoningtoolsstructuredvision		Jan 1, 2026
Helicone grok-4-1-fast-reasoning	$0.2	$0.5	$0.05	—	2M	reasoningtoolsno structuredno vision		Nov 17, 2025
LLM Gateway azure-ai-foundry/grok-4-1-fast-reasoning	$0.2	$0.5	—	—	2M	reasoningtoolsno structuredvision		Nov 19, 2025
Vercel AI Gateway spacexai/grok-4.1-fast-reasoning	$0.2	$0.5	$0.05	—	1M	reasoningtoolsno structuredvision		Nov 19, 2025
DevPass (LLM Gateway) grok-4-1-fast-reasoning	$0.2	$0.5	$0.05	—	2M	reasoningtoolsstructuredvision		Nov 19, 2025
302.AI grok-4-1-fast-reasoning	$0.2	$0.5	—	—	2M	reasoningtoolsno structuredvision		Nov 20, 2025
Vertex xai/grok-4.1-fast-reasoning	$0.2	$0.5	$0.05	—	128K	reasoningtoolsstructuredvision	deprecated	Nov 19, 2025
Qiniu x-ai/grok-4.1-fast-reasoning	—	—	—	—	—	reasoningtoolsno structuredvision		Dec 19, 2025
Poe xai/grok-4.1-fast-reasoning	—	—	—	—	2M	reasoningtoolsno structuredvision		Nov 19, 2025

Best price history

Daily lowest published price across live providers. A lower line is better for the buyer.

Best input /M: $0.18unchanged
Best output /M: $0.45unchanged
Provider coverage: 8; 8 at the start · 3 snapshots

Published best prices are unchanged.

3 daily snapshots collected from Sep 11, 2026 through Sep 14, 2026. A price chart will appear after the first real move.

Price badge

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Recent changes

Changelog →

new modelvia google-vertex · Sep 11, 2026

Prices are per million tokens (USD). “—” means the provider does not publicly list a price for this model. Data from models.dev; verify with the provider before purchasing.