Grok 4.1 Fast

Fast

grok-4-1-fast · Grok · text

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Platform

xAI Grok

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API Pricing

Input / 1M

$0.2/M$0.14/M30% OFF

Output / 1M

$0.5/M$0.35/M30% OFF

Cache Read / 1M

$0.05/M$0.035/M30% OFF

Overview

xAI's ultra-fast, cost-efficient Grok 4.1 Fast delivers a 256K context window with low latency and outstanding value. It supports Function Calling, Structured Output, and vision understanding, making it ideal for high-concurrency, low-latency workloads such as customer support, classification, and summarization.

Capabilities

256K context; Function Calling; Structured Output; vision understanding; JSON mode; high-speed responses; real-time X data integration.

Use Cases

High-concurrency customer support; classification and tagging; summary generation; lightweight code completion; image recognition; real-time information Q&A.

Limitations

Does not generate images; no cache_write support; weaker reasoning than Grok 4; max_tokens capped at 8K.

Examples

Claude Code

Anthropic official CLI coding agent. Multi-file edits, tool use, long-context reasoning.

Terminal

export ANTHROPIC_AUTH_TOKEN="YOUR_API_KEY"
export ANTHROPIC_BASE_URL="https://api.robovai.com"
export ANTHROPIC_MODEL="grok-4-1-fast"
claude

Context Window

2M ctx

Thinking Mode

Not supported

Overview

Grok 4.1 Fast, with a 2M context window. Ultra-fast responses at low cost, ideal for high-concurrency production tasks.