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High Reasoning

Grok 4.1 Fast

Grok 4.1 Fast is xAI's optimized API model designed for developers, featuring a massive 2 million token context window and dual reasoning modes to power high-speed agent workflows and complex tasks. Built for tool calling, autonomous agents, and real-time applications, it delivers fast, reliable responses with reduced hallucination rates at competitive pricing.

2M Context
High Intelligence
Nov '24 Knowledge

Available for Chat, Vision, and File Uploads.

Performance Benchmarks

MMLU
87%
MMMU
84.2%
HumanEval
74.1%

How do you want to interact?

Start a Conversation

Ask anything.
Have a natural conversation, brainstorm ideas, draft emails, or ask for advice.

Start Chatting

Use a Persona

Specialized Experts.
Instruct the AI to act as a Coding Tutor, Marketing Expert, or Travel Guide.

Pick a Persona

Why use Grok 4.1 Fast?

Agentic Tool Calling

Specialized training for autonomous workflows with reduced hallucinations and parallel processing

Extended Context Window

2 million token context length for processing extensive documentation and long conversations

Real-Time Information Retrieval

Native integration with X ecosystem for deep research and current data access

Capability Examples

Real-Time Customer Support
User: I'm frustrated with my slow internet—help troubleshoot now!
I sense your frustration—let's fix this fast. Check if other devices are connected and hogging bandwidth. Run a speed test at speedtest.net. If under 50Mbps, restart modem/router: unplug 30s, plug back. Still slow? Contact ISP with your results. Need more?
Deep Research Automation
User: Research latest EV battery breakthroughs since 2025, summarize key 3 with sources.
Scanning real-time X/web data: 1) Solid-state Na-ion batteries hit 500Wh/kg (CATL, Q1 2026 post). 2) Quantum-dot enhanced Li-metal cells, 2x cycle life (MIT lab, Mar 2026). 3) Bio-derived solid electrolytes for safety (Stanford, Feb 2026). Sources: X threads from @EVNewsDaily, IEEE papers. Deeper dive?

How to use

1
Go to Chat

Navigate to the "AI Chat" page.

2
Select Model

Ensure Grok 4.1 Fast is selected.

3
Type Prompt

Ask a question or paste code.

4
Interact

Refine the answer by replying to the AI.

Compare LLMs Side-by-Side

Is Grok 4.1 Fast better than Claude 3.5 or Gemini? Test same prompts simultaneously in the Chat Playground.

Open Chat Playground

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