grok-4-fast-reasoning

Context
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Max output
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Capabilities
vision
tool call
structured output
reasoning
json mode
streaming
fine tuning
batch
Details
Provider xAI
Creator xAI
Family—
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Knowledge cutoff—
Release date2025-09-04
Deprecation date—
Sourceofficial
Last updated2026-03-20
Max input—
API
GET/v1/models/xai/grok-4-fast-reasoning

grok-4-fast-reasoning

Changes · 1 entries
grok-4-fast-reasoningcreate8b78603Mar 21, 2026, 05:16 AM