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Grok 4 Fast

Grok 4 Fast - routes to reasoning or non-reasoning variant based on reasoning_effort parameter.

grok-4-fast
STABLE
Streaming
Vision
Tools
JSON Output

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xai/grok-4-fast
Context Size
2M
Stability
STABLE
Pricing
Input
$0.20
/M
Cached
$0.05
/M
Output
$0.50
/M
Tiered Pricing
≤128K tokens$0.20 in / $0.50 out
>128K tokens$0.40 in / $1.00 out
Capabilities
Streaming
Vision
Tools
JSON Output
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