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xAIClosed Weights

Grok 4.1 Fast

x-ai/grok-4.1-fast

Best Input Price

$0.20 / 1M

xAI's fast agentic tool-calling model with a 2M context window; non-reasoning variant for low-latency responses

Context Window

2,000,000 tokens

Reasoning

No

Tool Calling

Supported

Released

2025-11-19

Inference Providers (2)

ProviderModel IDContextInput / 1MOutput / 1MAction
Ofoxx-ai/grok-4.1-fast2,000,000$0.20$0.50Docs ↗
Vertexxai/grok-4.1-fast-non-reasoning128,000$0.20$0.50Docs ↗