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Grok 4 1 Fast Reasoning

xAI Grok

ActiveReleased 2025-11-01
ChatJSON modeReasoningStreamingTool calling
256K
Context window
Yes
Reasoning support
Yes
Tool calling

Pricing

Input
$0.2/M
Output
$0.5/M

Shown for Google Vertex AI, the primary provider surface for this model. Pricing is Cloptima's known static list pricing; live/negotiated rates may differ.

Available via 1 provider

Google Vertex AI
Gateway-routable
xai/grok-4.1-fast-reasoning
Context
256K
Input / Output
$0.2/$0.5 per M
ChatJSON modeReasoningStreamingTool calling