Grok 4.1 Fast

Grok 4.1 Fast is xAI's best agentic tool calling model that shines in real-world use cases like customer support and deep research. 2M context window. Reasoning can be enabled/disabled using the `rea

Creator: xAI
Lifecycle: Active
Context: 2.0M
Max output: 30.0K
Released: Nov 19, 2025
Status: up

Input: $0.20 / 1M tokens
Output: $0.50 / 1M tokens
Cached read: $0.05 / 1M tokens
Cached write: — / 1M tokens
Batch discount: —%
Source: OpenRouter
Verified: Apr 5, 2026 (High)

Capabilities

Modalities: textimagefile→text
Capabilities: reasoningimageInputpromptCachingfunctionCallingstructuredOutputs

Official Links

Intro

https://openrouter.ai/x-ai/grok-4.1-fast

Docs

https://openrouter.ai/x-ai/grok-4.1-fast

Pricing

https://openrouter.ai/models

Benchmark Coverage

Benchmark	Version	Score	Date	Source	Notes

Release History

Release	Alias	Lifecycle	Release Date	Deprecation	Shutdown	Summary
Grok 4.1 Fast	x-ai-grok-4-1-fast	Active	Nov 19, 2025	—	—	Model available via OpenRouter.

Host Coverage

Host	Type	Context	Pricing Note	Differences
OpenRouter	aggregator	2.0M	$0.20/1M in · $0.50/1M out via OpenRouter	—

Migration Guidance

Change Events

Date	Type	Title	Description	Source
Nov 19, 2025	family_added	Grok 4.1 Fast published	Model made available via OpenRouter.	OpenRouter

Other models from xAI

Grok 2, Grok 3, Grok 3 Beta, Grok 3 Mini, Grok 3 Mini Beta, Grok 4, Grok 4 Fast, Grok 4.20, Grok 4.20 Beta, Grok 4.20 Multi-Agent, Grok Code Fast 1