Grok 4 Fast chat, free on Rewind.ai
Model Details
About
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...
Use via API
curl https://api.rewind.ai/v1/chat/completions/ \
-H "Authorization: Bearer YOUR_KEY" \
-d '{"model":"x-ai/grok-4-fast"}'FAQ
Grok 4 Fast on Rewind.ai is a free AI tool. There's no charge and no sign up needed to start.
Yes. You get 2,500 free tokens per day to use Grok 4 Fast and every other tool on Rewind.ai. A free account raises that to 5,000 tokens/day. You can buy more starting at $1.
Grok 4 Fast runs open-source AI models on our GPU servers. Send your request and the result comes back in seconds.
No. You can use Grok 4 Fast right away without signing up. A free account doubles your daily usage to 5,000 tokens and saves your history.
Anonymous users get 2,500 tokens/day. Free accounts get 5,000 tokens/day. Tokens reset every 24 hours. Each generation costs ~100-5,000 tokens depending on the operation.
Your data is processed on our servers and isn't stored permanently unless you choose to save it. We don't sell or share it.
Yes. Content from Grok 4 Fast is yours to use for personal or commercial work. The AI models we run are commercially licensed.
Grok 4 Fast matches the quality of paid services because it runs the latest open-source AI models. The difference is you don't pay per use.
Grok 4 Fast runs open-source AI models including Qwen 2.5, FLUX and Whisper. We update to newer models as they ship.
Yes. Grok 4 Fast works in any mobile browser, and the layout adapts to your screen size.
Sign up for a free account to get 5,000 tokens/day, double the anonymous limit. Or buy token packs starting at $5 for 200,000 tokens. See /pricing/ for all options.
Yes. After you generate content, you can download it, copy it, or share it via a unique link. Signed-in users can also view their generation history.