xAIReleased on Nov 17, 2025

Grok-4.1 Fast Reasoning: Benchmarks, Pricing & Context Window

Grok-4.1 Fast Reasoning is a language model from xAI, released in November 2025, with multimodal input.

Bringing the next generation of tool-calling agents to the xAI API. Grok-4.1 Fast Reasoning is a high-speed variant optimized for faster inference while maintaining strong reasoning capabilities through thinking tokens.

Input
TextImage
Output
Text
Speed
Latency p952.83s
Throughput P9541.0char/s
Cost
$0.23/ 1M · 8:1 in:out
$0.20 in · $0.50 out

Grok-4.1 Fast Reasoning pricing

Providers

Grok-4.1 Fast Reasoning starts at $0.200 per million input tokens and $0.500 per million output tokens via xAI.

ProviderInput $/MOutput $/MMax InputMax OutputLatency p95 sThroughput P95QuantInputOutput
xAI logoxAI
$0.200$0.5002.0M30.0K
2.83
41 c/s
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Grok-4.1 Fast Reasoning API

API access coming soon

Grok-4.1 Fast Reasoning will be available through our gateway shortly.

Grok-4.1 Fast Reasoning examples

Recent arena outputs from Grok-4.1 Fast Reasoning, picked from the highest-ranked matchups.

Grok-4.1 Fast Reasoning license

Grok-4.1 Fast Reasoning is released under the Proprietary license, which restricts commercial use.

License
Proprietary
Non-commercial

Proprietary license - usage restrictions apply

FAQ

Common questions about Grok-4.1 Fast Reasoning.

When was Grok-4.1 Fast Reasoning released?

Grok-4.1 Fast Reasoning was released on November 17, 2025 by xAI. This is the official Grok-4.1 Fast Reasoning release date tracked on LLM Stats.

Is Grok-4.1 Fast Reasoning available via API?

Yes, Grok-4.1 Fast Reasoning is available via API. See the official documentation for authentication and endpoint details. It is served by 1 provider tracked on LLM Stats.

Who created Grok-4.1 Fast Reasoning?

Grok-4.1 Fast Reasoning was created by xAI.

What is the license for Grok-4.1 Fast Reasoning?

Grok-4.1 Fast Reasoning is released under the Proprietary license.

Is Grok-4.1 Fast Reasoning multimodal?

Yes, Grok-4.1 Fast Reasoning is multimodal and can accept both text and images as input.

Where can I use Grok-4.1 Fast Reasoning?

Grok-4.1 Fast Reasoning is available through 1 provider including xAI.

Where is the Grok-4.1 Fast Reasoning paper or technical report?

Grok-4.1 Fast Reasoning has a paper or technical report available at https://x.ai/news/grok-4.1. Use that source for architecture, training, release and evaluation details.