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Grok 4 Fast Reasoning

ReasoningTool CallingAttachmentsStructured Output

Fast Grok model for responsive chat, reasoning, and tool-assisted work

Providers5
ReleasedSep 1, 2025
Input Modalitiestext, image, audio, video
Output Modalitiestext
Tarsk Usecoding

Benchmarks

17.9
Intelligence Index
89.7
Math Index

Available Providers (5)

ProviderModel IDInput CostOutput CostContextMax OutputDocs
Jiekou.AIgrok-4-fast-reasoning$0.18/MTok$0.45/MTok2M2M
Heliconegrok-4-fast-reasoning$0.20/MTok$0.50/MTok2M2M
Poexai/grok-4-fast-reasoning$0.20/MTok$0.50/MTok2M128K
302.AIgrok-4-fast-reasoning$0.20/MTok$0.50/MTok2M30K
Qiniux-ai/grok-4-fast-reasoning—/MTok—/MTok2M2M

Capabilities

Reasoning
Tool Calling
Attachments
Open Weights
Structured Output