xAI

Grok 4 Fast

x-ai/grok-4-fast

2M context·30K max output·text+image->text

Input

$0.2000

per 1M tokens

Output

$0.5000

per 1M tokens

Cache Read

not available

Cache Write

not available

Quality Benchmarks

StrongValue: 209.6

Coding

Code generation, completion, debugging

47.3

Math

Competition math, calculus, olympiad

83.0

Reasoning

Logic, spatial, puzzle solving

80.9

Language

Summarization, paraphrase, writing

41.3

Overall

63.1

Source: LiveBench (livebench.ai) / Scores 0-100

Capabilities

VisionTool UseReasoningPrompt Caching

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