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Grok 4.1 Fast Reasoning

xAI·Operational·Released 2025-11-19text
Context2,000k
Max output-
Input / 1M$0.2 ↗
Output / 1M$0.5 ↗
Cached in$0.05
Benchmarks7

Benchmarks

Cited public sources · rank is exact-benchmark, apples-to-apples

SAGE (Vals AI)#69/7731.3% ↗
Vending-Bench 2 (Andon Labs)#45/591106.63 ↗
LMArena Elo#78/1411430.3 ↗
LMArena Vision (LMArena)#66/771196.3 ↗
LMArena WebDev (LMArena)#88/941241.3 ↗
FRAMES (Agent Tools API)87.6% ↗
Research-Eval Reka (Agent Tools API)63.9% ↗

Compare

vs Gemini 4 Argonvs GPT-6.1 Solvs Claude Sonnet 5.5vs Muse Spark 1.3vs GPT-6 Solvs GPT-6 Lunavs Claude Opus 5.5vs GPT-6 Astra

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Grok 4.1 Fast Reasoning FAQ

What is Grok 4.1 Fast Reasoning?
Grok 4.1 Fast Reasoning is a large language model from xAI, released on November 19, 2025. It accepts text input.
When was Grok 4.1 Fast Reasoning released?
xAI released Grok 4.1 Fast Reasoning on November 19, 2025.
How much does Grok 4.1 Fast Reasoning cost?
Grok 4.1 Fast Reasoning costs $0.20 per 1M input tokens and $0.50 per 1M output tokens through the xAI API. Cached input costs $0.05 per 1M tokens. Prices are from xAI's official pricing as of October 5, 2026.
What is Grok 4.1 Fast Reasoning's context window?
Grok 4.1 Fast Reasoning has a 2M-token context window.
How does Grok 4.1 Fast Reasoning score on benchmarks?
Grok 4.1 Fast Reasoning has 7 cited benchmark scores, including SAGE (Vals AI) 31.3%, Vending-Bench 2 (Andon Labs) 1106.63 and LMArena Elo 1430.3 Elo. Each score links to its source.

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