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Joined May 2012
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An early beta of Grok Build, an agentic CLI for coding, building apps, and automating workflows is now available for SuperGrok Heavy subscribers.
Through this early beta, we will improve the model and product based on your feedback.
Try it at x.ai/cli
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SpaceXAI and @cursor_ai are now working closely together to create the world’s best coding and knowledge work AI.
The combination of Cursor’s leading product and distribution to expert software engineers with SpaceX’s million H100 equivalent Colossus training supercomputer will allow us to build the world’s most useful models.
Cursor has also given SpaceX the right to acquire Cursor later this year for $60 billion or pay $10 billion for our work together.
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Grok 4.20 Heavy (Beta 2) is extremely fast for deep analysis.
Beta 3 will have many fixes and functionality gains.
The Grok 4.20 Beta shows three major improvements over Grok 4:
➤ Our lowest ever hallucination rate on the AA-Omniscience evaluation. When Grok did not know the answer, it hallucinated an incorrect answer 22% of the time - this is the lowest hallucination rate of any model we have tested, topping Claude Haiku 4.5 (25%)
➤ Top scores for instruction following and prompt adherence. On IFBench, Grok 4.20 takes the #1 spot with 82.9% - a 29.2 point increase on Grok 4
➤ Leading speed for its intelligence. At 265 tokens per second output speed on xAI’s API, Grok 4.20 is significantly faster than its peer and over 2x the output speed seen from Grok 4.1 Fast
Congratulations to @xai and @elonmusk on the 4.20 Beta 0309 launch!
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SpaceX has acquired xAI, forming one of the most ambitious, vertically integrated innovation engines on (and off) Earth → spacex.com/updates#xai-joins…
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sishaar retweeted
Feb 2
Tennesseans without power need immediate help.
I’m deeply grateful to @elonmusk & @xAI for going above & beyond to support Tennesseans by donating hundreds of generators to fill the gap, & I value their continued partnership to solve problems & support communities across our state.
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Today, we're excited to launch the Grok Voice Agent API, empowering developers to build voice agents that speak dozens of languages, call tools, and search realtime data.
x.ai/news/grok-voice-agent-a…
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sishaar retweeted
19 Sep 2025
xAI has released Grok 4 Fast - breaking through our intelligence vs cost frontier by achieving Gemini 2.5 Pro level intelligence at a ~25X cheaper cost
Intelligence: @xai shared with us pre-release access to Grok 4 Fast. In reasoning mode, the model scores an impressive 60 on our Artificial Analysis Intelligence Index, in line with Gemini 2.5 Pro and Claude 4.1 Opus, while sitting as expected below the prior Grok 4 release and GPT-5 (high). Grok 4 Fast performed especially well on coding evaluations, taking the number one spot on our leaderboard for LiveCodeBench, even outperforming its larger sibling Grok 4.
Cost: xAI is offering Grok 4 Fast at a very competitive price of only $0.2/1M Input Tokens and $0.5/1M output tokens. The model is also quite token efficient compared to other reasoning models, taking 61M tokens to complete our intelligence index, significantly less than Gemini 2.5 Pro’s 93M and Grok 4’s 120M. This competitive pricing and efficiency translates to the cost of running Artificial Analysis Intelligence Index being ~25X lower than Gemini 2.5 Pro and ~23X lower than GPT-5 (reasoning mode high).
Speed: When benchmarking the pre-release API, xAI’s endpoint for the model was very fast, achieving 344 output tokens per second - ~2.5X faster than OpenAI’s GPT-5 API. This also allows for End to End Latency results that are faster than most non-reasoning models for many workloads. Speeds may drop as traffic on the API increases - keep an eye on our live performance benchmarking to see how this evolves.
Congratulations to the @xai team and @elonmusk on this new release!
See below for more details and in-depth analysis 👇
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2M context window!!
Introducing Grok 4 Fast, a multimodal reasoning model with a 2M context window that sets a new standard for cost-efficient intelligence.
Available for free on grok.com, grok.x.com, iOS and Android apps, and OpenRouter.
x.ai/news/grok-4-fast
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Docked outside my doorstep, our last remaining heavy icebreaker.
Turns 50 years old this January!
Some info about the ship if you’re curious like me ➡️ grok.com/share/bGVnYWN5LWNvc…
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sishaar retweeted
5 Sep 2025
A United Airlines Boeing Dreamliner holds position at San Francisco as a British Airways Boeing beautifully descends through the fog to land.
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Real world vibes >> evals 🚀 Dunno what moves faster, grok-code-fast or the team behind it
3 days of grok-code-fast-1 in Cline:
"what would have taken me weeks is only taking a couple hours"
"feels 10x better and faster than Claude"
"feels like an entirely different model than the sonic i was testing"
The data?
>level with Sonnet-4 in diff edits, and improving
>significantly faster; 87 TPS vs 60TPS
Not just fast, but capable. Still early days, but very promising.
Even better, they're extending the free period another week, until Sept 10 at noon PT.
Great work by the @xAI team 👏
(@grok between you and me, what do you think of the new model?)
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Introducing Grok Code Fast 1, a speedy and economical reasoning model that excels at agentic coding.
Now available for free on GitHub Copilot, Cursor, Cline, Kilo Code, Roo Code, opencode, and Windsurf.
x.ai/news/grok-code-fast-1
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Did you know you can flip on your camera while voice-chatting with Grok, and it can talk about what it sees? Ever wondered exactly what it's focusing on? Now it highlights it in real-time - like these stickers on my water bottle! 🚀🔍
ALT Enable "Object Highlighting" in settings while in voice chat mode to allow Grok to point out what it sees on the screen for you. Make sure your app is up-to-date.
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Congrats @SpaceX team!! And thanks to the xAI hospitality team for setting up an awesome watch party 🚀
26 Aug 2025
LIFTOFF — Starship Flight 10!
Designed, built, and launched by SpaceX in the United States of America 🇺🇸
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sishaar retweeted
7 Aug 2025
Grok Imagine: Bring this legend to life.
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