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xAIGrok 4.1Nov 19, 2025

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

Context Window
2.0M
tokens
Max Output
30K
tokens
Released
Nov 19, 2025
Arena Rank
—
Output Speed
125
tokens/sec
Time to First Token
800ms
TTFT

Capabilities

👁Vision
🧠Reasoning
🔧Tool Calling
⚡Prompt Caching
🖥Computer Use
🎨Image Generation

Supported Parameters

Include Reasoning
Show reasoning tokens
Log Probs
Token probabilities
Max Tokens
Output length limit
Reasoning
Extended thinking
Response Format
JSON mode / structured output
Seed
Deterministic outputs
structured_outputs
Temperature
Controls randomness
Tool Choice
Control tool usage
Tool Calling
Function calling support
top_logprobs
Top P
Nucleus sampling

Pricing Comparison

RouterInput / 1MOutput / 1MCached Input / 1M
OpenRouter$0.20$0.50$0.05

Benchmarks

Artificial Analysis
Intelligence IndexArtificial Analysis
79/100
Coding IndexArtificial Analysis
74/100
Math IndexArtificial Analysis
85/100
MMLU-PROArtificial Analysis
0.835/1
GPQA DiamondArtificial Analysis
0.825/1
MATH-500Artificial Analysis
0.958/1
AIME 2024Artificial Analysis
0.82/1
Humanity's Last ExamArtificial Analysis
0.17/1
LiveCodeBenchArtificial Analysis
0.76/1
SciCodeArtificial Analysis
0.44/1

Model IDs

OpenRouterx-ai/grok-4.1-fast

Tags

visionreasoningtool-calling
Compare with another model

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