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 parameter in the API. Learn more in our docs

Model details

• Context window: 2,000,000 tokens
• Max completion size: 37 tokens
• Prompt cost / 1K tokens: $0.0000002
• Completion cost / 1K tokens: $0.0000005

Accepts

• Text
• Image

Produces

• Text

Benchmark performance All scores have maximum of 100 points.

Overall

• Score: 84
• Placement: 3rd

Cost

• Score: 97
• Placement: 4th

Logic

• Score: 89
• Placement: 3rd

Speed

• Score: 75
• Placement: 22nd

Scoring

• Score: 34
• Placement: 14th

Tool Use

• Score: 58
• Placement: 3rd

Hallucination

• Score: 89
• Placement: 5th

Classification

• Score: 50
• Placement: 1st

Structured Output

• Score: 92
• Placement: 2nd

Pricing

Competitor Scores

• Grok 4 Fast

  • Score: 88
  • Placement: 1st

• Qwen3 VL 235B A22B Instruct

  • Score: 86
  • Placement: 2nd

• Grok 4.1 Fast

  • Score: 84
  • Placement: 3rd

• GPT-5.1 Chat

  • Score: 82
  • Placement: 4th

• GPT-5.1-Codex

  • Score: 82
  • Placement: 4th

• Claude Haiku 4.5

  • Score: 80
  • Placement: 5th

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