Grok (SpaceXAI, formerly xAI)
Grok (SpaceXAI, formerly xAI) No signup
The catch: Free limits are unpublished. Chats are used for training unless you turn it off while logged in; logged-out use grants full training rights.
| Access | No signup |
|---|---|
| Free limits | Usable without logging in where available, or free with an account; free Chat and Voice limits are unpublished. xAI says Grok 4.5 powers Grok on grok.com, X, iOS and Android. |
| Modality | text, code, image, video, audio |
| Credit card | Not required |
| Commercial use | Allowed |
| Trains on your data | Yes, on the free tier |
| Licence or terms | SpaceXAI Terms of Service and Privacy Policy |
| Context window | – |
| Model id | – |
| Base URL | – |
| Last checked | 8 Oct 2026 |
How to use Grok 4.5
Use it in the browser; there is no API.
Paste into Claude Code
I want to use the free AI model "Grok 4.5" from Grok (model id: see the provider docs) without signing up. Please: 1. Check the provider docs and give me a minimal working request that needs no key. 2. Tell me the real limits and any catch (commercial use, data use, logging). Listed limits: Limits not published. 3. Tell me what changes if I get a free key, and when I should.
Before you ship on it
- Free limits are unpublished. Chats are used for training unless you turn it off while logged in; logged-out use grants full training rights.
- Prompts on the free tier may be used to train models. Keep customer data off it.
- SpaceXAI Consumer FAQ: you own Grok's Outputs and may use them 'as you wish, including for commercial use'; xAI asks you to attribute generated work to Grok.
- Free tiers are shared capacity: treat the limits as a ceiling, not a promise, and keep a paid fallback.
Questions
Is Grok (SpaceXAI, formerly xAI) free?
Yes. Grok offers it as no signup, with these limits: Limits not published. No credit card is needed.
Can I use Grok (SpaceXAI, formerly xAI) commercially?
Yes, under SpaceXAI Terms of Service and Privacy Policy. Check the current terms before you ship.
How do I start with Grok (SpaceXAI, formerly xAI)?
Use it in the browser; there is no API.
Source: x.ai/news/grok-4-5-everywhere, checked 8 Oct 2026.