Grok 4 Fast Reasoning

Grok 4 optimized for fast reasoning.

grok-4-fast-reasoning
STABLE
Streaming
Vision
Tools
JSON Output

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xai/grok-4-fast-reasoning
Context Size
2M
Stability
STABLE
Pricing
Input
$0.40
/M
Cached
$0.05
/M
Output
$1.00
/M
Capabilities
Streaming
Vision
Tools
JSON Output
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