xAI: Grok 4.1 Fast

Public pricingIntelligence 79/100Huge memory视觉深度思考工具调用

xAI: Grok 4.1 Fast 是一款多模态模型，适合推理、规划和自动化。它结合了多模态输入处理、可靠的工具调用与智能体表现、1M+ tokens上下文和低成本定位，可在reasoning, planning, and multi-step automation中提供可靠表现。它适合重视延迟、成本与吞吐的团队，能带来稳定输出、灵活部署与扩展空间。 它适合需要稳定回答、较长上下文、清晰结构和可扩展部署的团队。 它适合需要稳定回答、较长上下文、清晰结构和可扩展部署的团队。 它适合需要稳定回答、较长上下文、清晰结构和可扩展部署的团队。 它适合需要稳定回答、较长上下文、清晰结构和可扩展部署的团队。 它适合需要稳定回答、较长上下文、清晰结构和可扩展部署的团队。 它适合需要稳定回答、较长上下文、清晰结构和可扩展部署的团队。

Input

$0.20/1M

Output

$0.50/1M

Cached

$0.05/1M

Batch

$0.10/1M

Calculate your Grok 4.1 Fast bill.

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What would Grok 4.1 Fast cost you?

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1,00010,00050,000250,0001M10M

Technical specifications

Grok 4.1 Fast at a glance.

Memory

2,000,000

tokens

Max reply

30,000

tokens

Memory tier

Huge

multiple books or whole repositories

Tokenizer

grok

Released

Nov 2025

Training cutoff

Apr 2025

Availability

Public pricing

Status

active

What it can do

Capabilities & limits.

  • Understands images
  • Deep step-by-step thinking
  • Uses tools / calls functions
  • Strict JSON output
  • Streams replies
  • Fine-tunable on your data

When to pick Grok 4.1 Fast

  • Multi-step reasoning, research agents, or hard math.
  • Screenshot analysis, image understanding, or document OCR.
  • Agentic workflows that call tools or APIs.
  • Long documents, full codebases, or extensive chat histories.

When to look elsewhere

  • Very latency-sensitive, real-time apps where every millisecond counts.

Alternatives

Similar models to compare.

FAQ

Grok 4.1 Fast — the questions we see most.

Pricing, capabilities, alternatives — generated from the same data that powers the calculator above.

Get instant answers from our AI agent

At a typical workload of 50,000 conversations a month with 1,500-token prompts and 800-token replies, Grok 4.1 Fast costs roughly $35 per month. Input is $0.20 /1M tokens and output is $0.50 /1M tokens.
Grok 4.1 Fast has a 2,000,000-token context window (huge memory — multiple books or whole repositories). That means you can fit about 375,000 words of input and history in a single call.
Beyond text generation, Grok 4.1 Fast supports understanding images, deep step-by-step reasoning, calling functions / tools, strict JSON output. It streams replies by default.
Grok 4.1 Fast was released in November 2025, with training data cut off around April 2025.
Models in a similar class include Grok 4 Fast, GPT-5.4 Nano, Gemini 3.1 Flash Lite Preview. The "Similar models" section below this FAQ links into each.

Still unsure?

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