Grok 4.1 Fast

GrokvFastCurrent

by

xAI(ai lab)

Released November 19, 2025

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

Tags

multimodalbudget-friendlylong-context

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

Pricing Calculator

Input tokens/month

Output tokens/month

Input cost$0.20

Output cost$0.25

Estimated monthly cost$0.45

Cache read: $0.0500/M tokens

Competing Models

Same pricing tier — direct alternatives to Grok 4.1 Fast

specialty

Qwen3-VL alibaba

52

129

$0.20/M / $0.60/MCompare

GPT-5.4 Nano openai

$0.20/M / $1.25/MCompare

Qwen3.6 Plus alibaba

68

59.5

$0.33/M / $1.95/MCompare

Gemma 4 26B A4B google

-- / --Compare

Mistral Small 4 mistral

21

55.2

$0.15/M / $0.60/MCompare

Claude Opus 4.7 anthropic

65

4.3

$5.00/M / $25.00/MCompare

Llama Guard 4 12B meta

$0.18/M / $0.18/MCompare

Grok 4.20 Multi-Agent xai

$2.00/M / $6.00/MCompare

Nova 2 Lite amazon

$0.30/M / $2.50/MCompare

Sonar Pro Search perplexity

30

3.3

$3.00/M / $15.00/MCompare

Seed-2.0-Lite bytedance

$0.25/M / $2.00/MCompare

Kimi K2.5 moonshot-ai

48

45.5

$0.38/M / $1.72/MCompare

MiMo-V2-Omni xiaomi

$0.40/M / $2.00/MCompare

$0.10/M / $0.10/MCompare

GPT-5.4 Mini openai

38

14.6

$0.75/M / $4.50/MCompare

Qwen3.5-9B alibaba

38

303

$0.10/M / $0.15/MCompare

Gemma 4 26B A4B google

$0.08/M / $0.35/MCompare

Llama 4 Maverick meta

37

98.9

$0.15/M / $0.60/MCompare

GLM 5V Turbo z-ai

$1.20/M / $4.00/MCompare

70

17.4

$2.00/M / $6.00/MCompare

Nova Premier 1.0 amazon

$2.50/M / $12.50/MCompare

Sonar Reasoning Pro perplexity

58

11.5

$2.00/M / $8.00/MCompare

Seed-2.0-Mini bytedance

$0.10/M / $0.40/MCompare

GPT-5.4 Pro openai

77

0.7

$30.00/M / $180.00/MCompare

Qwen3.5-35B-A3B alibaba

55

75.8

$0.16/M / $1.30/MCompare

Gemma 4 31B google

43

-- / --Compare

Claude Sonnet 4.6 anthropic

42

4.7

$3.00/M / $15.00/MCompare

Llama 4 Scout meta

14

72.1

$0.08/M / $0.30/MCompare

Nova Lite 1.0 amazon

$0.06/M / $0.24/MCompare

Sonar Pro perplexity

21

2.3

$3.00/M / $15.00/MCompare

ERNIE 4.5 VL 28B A3B baidu

$0.14/M / $0.56/MCompare

Seed 1.6 Flash bytedance

$0.07/M / $0.30/MCompare

68

7.8

$2.50/M / $15.00/MCompare

Qwen3.5-27B alibaba

42

47.5

$0.20/M / $1.56/MCompare

Gemma 4 31B google

43

169

$0.13/M / $0.38/MCompare

Ministral 3 14B 2512 mistral

$0.20/M / $0.20/MCompare

Claude Opus 4.6 anthropic

56

3.7

$5.00/M / $25.00/MCompare

Grok 4 Fast xai

$0.20/M / $0.50/MCompare

Spotlight arcee-ai

$0.18/M / $0.18/MCompare

ERNIE 4.5 VL 424B A47B baidu

$0.42/M / $1.25/MCompare

Seed 1.6 bytedance

$0.25/M / $2.00/MCompare

87

5.0

$5.00/M / $30.00/MCompare

GPT-5.5 Pro openai

95

0.9

$30.00/M / $180.00/MCompare

xAIai lab

Understand the Universe

1 Tools4 ModelsFounded 2023Palo Alto, California

View full profile

1 Tools·4 Models

Tools by xAI

Other AI tools from the same organization.

Grok

Grok

AI Assistant

Explore Career Opportunities and Advanced AI Solutions at xAI

AI Models by xAI

Large language models from the same organization.

Model	Context Window	Price (In / Out per M)	Capabilities
Grok 4.20 Multi-AgentCurrent	2.0M	$2.00 / $6.00	textvisioncode
Grok 4.20Current	2.0M	$2.00 / $6.00	textvisioncode
Grok 4 FastCurrent	2.0M	$0.20 / $0.50	textvisioncode

Related News

Latest coverage and updates.

Musk Says SpaceX-Anthropic Deal Is 180-Day Lease, Not 3-Year Commitment

Musk Says SpaceX-Anthropic Deal Is 180-Day Lease, Not 3-Year Commitment

May 29, 2026

OpenAI Acquires Voice-Cloning Startup Weights.gg in a Pre-IPO Cleanup

OpenAI Acquires Voice-Cloning Startup Weights.gg in a Pre-IPO Cleanup

May 18, 2026

Anthropic's 80x Growth Sends It Scrambling for SpaceX Compute as Musk Becomes AI Landlord

Anthropic's 80x Growth Sends It Scrambling for SpaceX Compute as Musk Becomes AI Landlord

May 8, 2026

Musk vs OpenAI Trial Begins With $150 Billion and AI Governance at Stake

Musk vs OpenAI Trial Begins With $150 Billion and AI Governance at Stake

Apr 27, 2026

OpenAI IPO Filing Set for This Week: What Builders Need to Know

OpenAI IPO Filing Set for This Week: What Builders Need to Know

May 21, 2026

Google, Microsoft, and xAI Open AI Models to US Government Security Reviews

Google, Microsoft, and xAI Open AI Models to US Government Security Reviews

May 6, 2026