Model Cost Profile

xAI: Grok 4 Fast

Developer: x-ai

Pricing updated Mar 11, 2026

Input rank: #141Output rank: #124

Live Pricing

Input: $0.2000

Output: $0.5000

Get API Key View full pricing leaderboard

Pricing via OpenRouter API · Last synced Mar 11, 2026 · MMLU score via public benchmark data

xAI: Grok 4 Fast offers a substantial context window of 2,000,000 tokens, making it ideal for applications requiring extensive text analysis, such as legal document review or large-scale content generation. With an input price of $0.20 per million tokens and an output price of $0.50 per million tokens, teams can effectively manage costs while leveraging the model for complex tasks that demand high token utilization. This pricing structure encourages efficient usage, allowing organizations to optimize their budget while benefiting from advanced AI capabilities.

👁 Vision🔧 Tool Calling📋 Structured Output🧠 Reasoning

Context Window

2,000,000

Tokens

Input Price / 1M

$0.2000

Prompt tokens

Output Price / 1M

$0.5000

Completion tokens

Intelligence (MMLU)

85.4

Massive Multitask Language Understanding

Benchmark Scores

Standardized evaluation scores for xAI: Grok 4 Fast.

Benchmark	Score	Rank	Source
GPQA	85.3	#7 of 118	artificial_analysis
MMLU	85.4	#10 of 121	artificial_analysis

Side-by-Side Pricing Table

Usage Type	Price / 1M Tokens
Input (Prompt)	$0.2000
Output (Completion)	$0.5000

Compare with xAI: Grok 4.1 Fast Compare with AllenAI: Molmo2 8B Compare with AllenAI: Olmo 3.1 32B Instruct

Price History

xAI: Grok 4 Fast Pricing Trend

Input / 1M tokens0.0%Output / 1M tokens0.0%

Mar 7 — Mar 11

Current Input / 1M

$0.2000

Current Output / 1M

$0.5000

Cost Calculator

Estimate monthly spend for xAI: Grok 4 Fast based on your workload.

Input tokens / month

01.0B

Output tokens / month

0500M

Estimated Monthly Cost

$11

25M input + 12M output tokens

Same Workload on Other Models

Arcee AI: Trinity Large Preview (free)$0.00−$11 Arcee AI: Trinity Mini (free)$0.00−$11 Google: Gemma 3 12B (free)$0.00−$11 Google: Gemma 3 27B (free)$0.00−$11

Cheaper Alternatives to Compare

Quick links for cost-down decisions before production rollout.

xAI: Grok 4 Fast vs Arcee AI: Trinity Large Preview (free)xAI: Grok 4 Fast vs Arcee AI: Trinity Mini (free)xAI: Grok 4 Fast vs Google: Gemma 3 12B (free)xAI: Grok 4 Fast vs Google: Gemma 3 27B (free)

FAQ

Common pricing and benchmark questions for xAI: Grok 4 Fast.

How much does xAI: Grok 4 Fast cost per 1M input tokens?

xAI: Grok 4 Fast input pricing is $0.2000 per 1M tokens based on the latest synced provider data.

How much does xAI: Grok 4 Fast cost per 1M output tokens?

xAI: Grok 4 Fast output pricing is $0.5000 per 1M tokens based on the latest synced provider data.

What context window does xAI: Grok 4 Fast support?

xAI: Grok 4 Fast supports a context window of 2,000,000 tokens.

How can I compare xAI: Grok 4 Fast with cheaper alternatives?

Use the comparison links on this page to open direct model-vs-model pricing and benchmark pages, then evaluate monthly spend projections for your workload.