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Model details

grok-4-1-fast-reasoning

Grok-4.1 Fast Reasoning is a frontier multimodal model engineered to excel in high-performance agentic workflows. Its architecture is specifically optimized for robust tool calling, allowing it to interface seamlessly with external systems and perform complex actions. By incorporating a reasoning step that occurs before the model generates a response, it is designed to handle tasks that require deeper deliberation, making it a strong choice for applications that demand both precision and the ability to return information in highly organized, structured formats.

Built to support demanding technical environments, the model offers a massive context window that enables it to process extensive information sets in a single pass. Its design lineage emphasizes practical utility in automated environments, where it can be deployed to look up information and execute multi-step tasks. With its focus on efficiency and structured output, the model is well-suited for developers and enterprises looking to integrate advanced reasoning capabilities into their existing software ecosystems and automated agent pipelines.

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Quick Info

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Provider
302.AI
Model key
grok-4-1-fast-reasoning
Release date
Nov 20, 2025
Last updated
Nov 20, 2025
Knowledge cutoff
2025-06
Input modalities
Output modalities
Capabilities

Cost

Input token cost
$0.20
Output token cost
$0.50

Limits

Output tokens
30,000 tokens
Context window
2,000,000 tokens
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Latest news about grok-4-1-fast-reasoning

Jiekou.AI

Coverage

A third-party Medium article (Aug 4, 2026) explicitly names the API variant grok-4-1-fast-reasoning, alongside its sibling grok-4-1-fast-non-reasoning, and confirms the Nov 19, 2025 xAI launch date for the Grok 4.1 Fast family. The piece describes the reasoning variant as the workflow choice suited to tasks that benefi For developers, the article frames the model's value around the hosted Agent Tools API, which bundles real-time X search, web search, code execution, uploaded-document search, and Model Context Protocol connections into a more centralized stack. It argues the practical question shifts from "can the model call a tool?"

Jiekou.AI

CoverageBenchmark

The BenchLM.ai aggregator profile explicitly names Grok 4.1 Fast (Reasoning) and lists a release date of Nov 19, 2025, classifying it as a proprietary reasoning model with a reported 2M-token context window. Creator attribution is given as xAI, and the page records a composite capability score of 55.1/100, ranking the On the limitations relevant to technical readers, the catalog notes that only one source-displayable benchmark row is published and that no comparable first-party API price is listed, so the benchmark evidence for the exact reasoning variant is thin. Speed and time-to-first-token are also marked as not measured, leavin

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