Grok 4 Fast

grok

OpenRouter · x-ai/grok-4-fast

Capabilities

Tool CallYes

ReasoningYes

Structured OutputYes

Temperature ControlYes

AttachmentsNo

Open WeightsNo

Input

textimage

Output

text

Input$0.20

Output$0.50

Cache Read$0.05

Cache Write$0.05

Direct installation coming soon — March 2026

ProviderOpenRouter

Model IDx-ai/grok-4-fast

Familygrok

Knowledge Cutoff2024-11

Release Date2025-08-19

Last Updated2025-08-19

Context2.0M

Max Output30K

@openrouter/ai-sdk-provider