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xAI
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 reasoning enabled parameter in the API. Learn more in our docs

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Model details

Context window2,000,000 tokens
Max completion size37 tokens
Prompt cost / 1K tokens$0.0000002
Completion cost / 1K tokens$0.0000005
Accepts
Produces

Benchmark performance

Overall

84
score
3rd
placement

Cost

97
score
4th
placement

Logic

89
score
3rd
placement

Speed

75
score
22nd
placement

Scoring

34
score
14th
placement

Tool Use

58
score
3rd
placement

Hallucination

89
score
5th
placement

Classification

50
score
1st
placement

Structured Output

92
score
2nd
placement

Pricing

Usage pricing
Prompt
$0.0000002
Completion
$0.0000005
Request
FREE
Image
FREE
Web Search
FREE
Internal Reasoning
FREE

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