xAI: Grok 4 Fast

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...

Modalities

Input

textimage

Output

text

Pricing

Cost per 1 million tokens

Input

$0.24

Output

$0.6

Model Specs

Context Window

2,000,000

Max Output

30,000

Release Date

2025-08-19

Knowledge Cutoff

2024-11

Capabilities

Reasoning

Tool Calling

Vision

Last Updated: 2025-08-19

Provider: