The Grok family
Models and products
Grok
The family of AI models from xAI, now SpaceXAI. The newest release confirmed here is Grok 4.5, released July 8, 2026 at $2 per million input tokens and $6 per million output tokens.
MoreGrok Bot
SpaceXAI's always-on AI agents, launched in beta on August 11, 2026. Each runs on a cloud computer, signs into a team's tools and asks for approval when needed. Offered on desktop and iOS, with an enterprise waitlist.
MoreGrok Voice
Grok Voice is SpaceX Super Intelligence's speech-to-speech model family, sold through an API. Version 3.0 was announced October 14, 2026 at $0.08 per minute. The company says it also runs Grok Bot voice mode and voice features in Tesla vehicles.
MoreOn the timeline
Grok, date by date
Elon Musk Reported
Said in a reply on X that the cost of serving Grok Bot was unsustainably high relative to revenue. Users were reported to be running out of weekly allowances days early; no cost figure was given and the report does not say whether allowances were cut.
Elon Musk Reported
Musk said SpaceX would make users whole if Grok Bot makes a purchase mistake or leaks a card, without saying what the pledge covers, and that a card leak had not happened yet. The bot’s terms say financial transactions need human review.
SpaceXAI Confirmed
Said Grok 4.7 works longer on hard tasks and checks its own work more carefully than earlier versions, with a fast variant that gives twice the output speed at twice the price.
SpaceXAI Reported
SpaceXAI said Grok 4.5 is about twice as token-efficient as other leading models, and Musk said it is roughly on par with Anthropic's Opus 4.7 but faster. Neither claim has been independently tested.
Which one
Which Grok should I use?
Quick answers with X context
Grok in the X app or on grok.com
Work done for you across your tools
Grok Bot, an agent that runs on a cloud computer and asks before it acts
Talking, hands-free
Grok Voice
Building an app
The Grok API, documented at docs.x.ai
Compare
Grok vs other assistants
| Grok | ChatGPT | Claude | Gemini | |
|---|---|---|---|---|
| Maker | xAI, part of SpaceX since February 2026 | OpenAI | Anthropic | |
| Known for | Real-time X context, voice and agents | A broad consumer assistant | Long documents and coding | Working inside Google's apps |
| Where to use it | grok.com, the X app, its own apps and an API | chatgpt.com, apps and an API | claude.ai, apps and an API | gemini.google.com, apps and an API |
Fan pick · Try Grok Bot
Let Grok Bot do the busywork
Grok Bot is SpaceX AI's always-on agent. It signs in to the tools you use, does multi-step work on its own cloud computer and asks for approval before anything important. New users get their first two weeks of X Premium, the plan that includes it, free through this link.
https://grok.com/refer/bot?code=6JDJ46N5RV8EReferral link. We get a reward if you subscribe. Pad Zero's reward is one usage reset on its own plan, with no cash value. If you are new to Grok and start a trial through this link on grok.com, your first 14 days of X Premium are free. A payment card is required and nothing is charged at checkout; unless you cancel before the trial ends, the plan renews monthly at the price shown at checkout. The trial is for people 18 or older, where the program is offered, with no earlier Grok or X Subscription trial and no paid Grok, SuperGrok, X Premium, Cursor or X Subscription plan in the last 12 months. X Subscription Corp sets the rules in its program terms (updated October 27, 2026). Pad Zero SI is an unofficial fan site and is not affiliated with SpaceX, xAI or X.
News
Latest Grok news
Cursor adds realtime voice chat with agents, powered by Grok Voice
On November 6, 2026, Cursor launched Voice Chat with Agents across the Agents Window, IDE, web, and iOS. It runs on Grok Voice.
Read moreGrok API text gets an invisible watermark by default from November 7
SpaceXSI's docs say seven Grok models will watermark API text starting Nov. 7. An x-watermark header shows if a response was marked, and admins can opt out.
Read morexAI's Data Bot is a Team Bot that works like a shared data scientist
In a Nov. 2 post, SpaceXSI described Data Bot: a Grok Bot Team Bot taught by the data team to query the warehouse, run analyses and post Slack reports.
Read moreFAQ
Grok questions
What is Grok?
Grok is a family of AI models and assistants made by xAI, now part of SpaceX. It answers questions, writes, codes, reads images and talks by voice, and it can draw on real-time posts from X.
Who makes Grok?
xAI, the AI company Elon Musk founded in 2023. It became part of SpaceX in February 2026; the dated sources are on the Pad Zero SI timeline.
What is Grok Bot?
Grok Bot is an always-on AI agent from SpaceX's AI side. Each one runs on its own cloud computer, connects to your apps and asks for approval before anything important. Its card above has the date we last checked it.
Grok vs ChatGPT: what's the difference?
Both are general AI assistants. Grok is built by xAI and wired into X for real-time context; ChatGPT is built by OpenAI. Features and models change often, so use the dated table above as a starting point.
Is Grok free?
Grok has free and paid tiers that change over time. See grok.com for the current plans; Pad Zero SI doesn't quote prices.
Is there a Grok API?
Yes. Developers can call Grok models through the xAI API, documented at docs.x.ai.
Is Pad Zero SI run by xAI or SpaceX?
No. Pad Zero SI is an independent fan site, not affiliated with SpaceX, xAI or X. Grok Bot links on it are labeled referral links.
Answers as of November 4, 2026.