xAI
X-Ai/Grok-4-Fast-Reasoning
Fast Grok model for responsive chat, reasoning, and tool-assisted work
xai/grok-4-fast-reasoning
Context
2M
Output
2M
Released
2025-12-18
Knowledge cutoff
—
Types
InputTextImageAudioVideo
OutputText
Reasoning
Supported
Tool use
Supported
Structured output
—
Attachments
Supported
Open weights
—
Provider pricing
Poe
InTextImage
OutText
- Price
- $0.20 / $0.50
- Context
- 2M
- Status
- Stable