xAI: Grok 4 Fast by Kilo Gateway — Specs, Pricing & Capabilities | whichllm

Model ID x-ai/grok-4-fast

Provider Kilo Gateway

Family -

Status -

Knowledge Cutoff -

Release Date 2025-08-19

Input Modalities text, image

Output Modalities text

Context Window 2000000

Input Limit -

Output Limit 30000

Tool Calling Yes

Reasoning Yes

Structured Output -

Temperature Control Yes

Open Weights No

Input Cost / 1M tokens $0.20

Output Cost / 1M tokens $0.50

Reasoning Cost / 1M tokens -

Cache Read Cost / 1M tokens $0.05

Cache Write Cost / 1M tokens -