Grok 4.1 Fast

xAI · 2025 · Reasoning LLM · USA

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A to Z

A · App: Yes
B · Built By: xAI
C · CEO & Politics: Elon Musk — Right / Republican; largest individual donor of 2024 cycle; revived America PAC with $100M+ for GOP in 2026 midterms (America Party plan shelved)
D · Date: 2025
E · Expertise: Beginner (app available)
F · Free Tier: No free tier
G · Generates: Text only
H · Deployment: Cloud only (proprietary)
I · Inputs: Text
J · Jurisdiction: USA
K · Key Staffers: Part of SpaceX (Elon Musk, CEO); Gwynne Shotwell (SpaceX President)
L · Languages: English-primary
M · Model Type: Reasoning LLM
N · Safety Issues: Use official system card/docs for model-specific risk details.
O · Open Source: Proprietary
P · Pricing: Retired (xAI API retired Grok 4.1 Fast on May 15, 2026; requests now go to Grok 4.3)
Q · AIDb Rating: [UNKNOWN]
R · What Makes It Special: xAI's Grok 4.1 Fast (November 19, 2025), which xAI called its best tool-calling model, with a 2M-token context and long-horizon reinforcement learning for consistent multi-turn agent performance; it launched with the Agent Tools API (X and web search, remote code execution and more) for agents in fields such as customer support and finance, at $0.20/$0.50 per million tokens. xAI retired it from its API on May 15, 2026, redirecting requests to Grok 4.3.
S · Stock / Status: Public via SpaceX (Nasdaq: SPCX, IPO Jun 12, 2026); $145 (SPCX, Sep 28, 2026)
T · Training Cutoff: [UNKNOWN]
U · Users: [UNKNOWN]
V · Voice Chat: Yes
W · Weights: API only
X · X Handle: @SpaceXSI
Y · Year Founded: [UNKNOWN]
Z · Bottom Line: Proprietary Reasoning LLM from xAI, released 2025.

Data completeness 85% · Last verified 2026-08-09 · Primary source ↗

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“Grok 4.1 Fast.” AIDb — The AI Database. Verified 2026-08-09. https://theaidatabase.com/m/xai-grok-4-1-fast.html

Grok 4.1 Fast

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