cheapReleased 2025-12

Grok 4.1 Fast

By xAI · Cheap workhorse, 2M context.

Input / 1M

$0.20

Output / 1M

$0.50

Context

2M tokens

Max output

—

Grok 4.1 Fast pricing

Grok 4.1 Fast costs $0.20 per million input tokens and $0.50 per million output tokens at standard API rates, with cached input at $0.050/M. That makes it cheaper than 22 of 25 other tracked models on input.

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Specs

Maker: xAI
Category: cheap
Released: 2025-12
Modalities: text, vision
Open weights: No (proprietary API)
Context window: 2M tokens
Max output: —

Official API docs ↗

Compare Grok 4.1 Fast with

Gemini 3.1 Flash-Lite

Google · $0.25/$1.50 per 1M

DeepSeek V4 Flash

DeepSeek · $0.14/$0.28 per 1M

GPT-5.5

OpenAI · $5.00/$30.00 per 1M

GPT-5.4

OpenAI · $2.50/$15.00 per 1M

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Data verified 2026-06-20. Prices are standard USD API rates per 1M tokens.