Grok 4.1 Fast

Grok 4.1 Fast is xAI's most cost-effective model. It excels at tool calling for lightweight tasks, powers latency-sensitive applications, and shines in search-related tasks.

Reasoning

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Supported regions
Model ID	`grok-4.1-fast-reasoning`
Launch stage	Preview
Supported inputs & outputs	Inputs: Text, Image Outputs: Text
Capabilities	Supported Function calling Preview feature Structured output Preview feature Reasoning Preview feature Not supported Batch predictions Preview feature
Usage types	Supported Fixed quota Preview feature Not supported Dynamic shared quota Preview feature Provisioned Throughput Preview feature
Versions	`grok-4.1-fast-reasoning` Launch stage: Preview Release date: April 7, 2026
Supported regions	Model availability	Global `global endpoint`
Quota limits	global endpoint: QPM: 160 Input TPM: 880,000 Output TPM: 40,000 Context length: 128,000
Pricing	See Pricing.

Non-Reasoning

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Supported regions
Model ID	`grok-4.1-fast-non-reasoning`
Launch stage	Preview
Supported inputs & outputs	Inputs: Text, Image Outputs: Text
Capabilities	Supported Function calling Preview feature Structured output Preview feature Not supported Batch predictions Preview feature Reasoning Preview feature
Usage types	Supported Fixed quota Preview feature Not supported Dynamic shared quota Preview feature Provisioned Throughput Preview feature
Versions	`grok-4.1-fast-non-reasoning` Launch stage: Preview Release date: April 7, 2026
Supported regions	Model availability	Global `global endpoint`
Quota limits	global endpoint: QPM: 160 Input TPM: 880,000 Output TPM: 40,000 Context length: 128,000
Pricing	See Pricing.

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Last updated 2026-04-10 UTC.