X
xAI: grok-4-fast-non-reasoning:free
grok-4-fast-non-reasoning:free
2M context131.1K outToolsVisionFilesStructuredWeb search
Released Sep 19, 2025Knowledge cutoff Oct 2024Updated Jun 20, 2026
Grok 4 Fast is xAI's latest multimodal model with SOTA cost-efficiency and a 2M token context window. It comes in two flavors: non-reasoning and reasoning. Read more about the model on xAI's news post. Reasoning can be enabled/disabled using the reasoning enabled parameter in the API. Learn more in our docs
Mode chatDeprecation May 2026
Pricing
Input price
$0.00/ 1M tokens
Output price
$0.00/ 1M tokens
Context window 131.1K tokensCompatible endpoints openaiVendor xAI
Uptime
Performance
Loading performance data...
Usage & Ranking
Loading usage...