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xAIGrok 4Arena #39Sep 19, 2025

Grok 4 Fast

Grok 4 Fast is xAI's latest multimodal model with SOTA cost-efficiency and a 2M token context window. It comes in two flavors: non-reasoning and reasoning. Read more about the model on xAI's news post. 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
Sep 19, 2025
Arena Rank
#39
of 305 models
Output Speed
185
tokens/sec
Time to First Token
450ms
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
Requesty★$0.20$0.50$0.05
OpenRouter$0.20$0.50$0.05

Benchmarks

Artificial Analysis
Intelligence IndexArtificial Analysis
68/100
Coding IndexArtificial Analysis
62/100
Math IndexArtificial Analysis
72/100
MMLU-PROArtificial Analysis
0.778/1
GPQA DiamondArtificial Analysis
0.695/1
MATH-500Artificial Analysis
0.888/1
AIME 2024Artificial Analysis
0.48/1
Humanity's Last ExamArtificial Analysis
0.06/1
LiveCodeBenchArtificial Analysis
0.605/1
SciCodeArtificial Analysis
0.32/1

Model IDs

Requestyxai/grok-4-fast
OpenRouterx-ai/grok-4-fast

Tags

tool-callingcaching
Compare with another model

Compare with…

Grok 4 1 Fast ReasoningGrok 4 Fast ReasoningGrok 4 Fast Non Reasoning

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