Grok 4 Fast Non-Reasoning
RetiredAn xAI model with a 2M-token context window, image input and tool calling. Released on the xAI API September 19, 2025, now retired.
Access details: xAI API
An alias. The provider can point it at a newer version.
grok-4-fast-non-reasoningUpdated Sep 23, 2026
Capabilities & limits
- Context window
- 2M
- Maximum output
- Not published
- Image input
- Supported
- Tool calling
- Supported
- Structured output
- Supported
Pricing
USD / 1M tokens- Input
- No longer sold
- Output
- No longer sold
No longer sold on the xAI API.
Price history
May 15, 2026
Input No longer sold per million tokens
May 15, 2026
Output No longer sold per million tokens
Technical details
- Parameters
- Not published
- Active parameters
- Not published
- Architecture
- Not published
- Training / knowledge cutoff
- Not published
- Input modalities
- Text, image
- Output modalities
- Text
From xAI
Official announcement ↗Release & lifecycle
- First available
- Sep 19, 2025
- retired
- May 15, 2026