Posts
Elon Musk
@elonmusk · Jul 9, 2026
Cool
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Kun Chen
@kunchenguid · Jul 9, 2026
grok 4.5 made me give grok build a serious run today
here's my honest first impression (non affiliated neutral view point):
1. grok build is a very good harness
firstmate stretches harness capabilities to their limits, and i've been testing it with claude code, codex, opencode, pi and grok build
so far, grok build and claude code are the only two harnesses that can automatically wake up when the background polling process finishes
codex hard fails on this kind of background polling task, with no escape hatch. opencode and pi can both do it with custom plugins, but not out of the box
grok build also feels really clean, smooth, and transparent. you can see what background tasks are running, what hooks got triggered at what step, context window, token usage etc all out of the box and somehow the UI does not feel cluttered at all
2. grok 4.5 is a very good model
i've been using opus 4.8 as my primary firstmate, and today i did a full switch to grok 4.5. so far i don't think anything degraded, while token throughput is a lot faster, although time-to-first-byte for each response seems long - i wonder if prompt caching is done properly or no
3. the quota that comes with X premium is quite generous, and there's no session level limit
so overall i'm quite pleased by this and plan to switch a lot of my tasks to grok. the landscape just got a lot more interesting...
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Brian Roemmele
@BrianRoemmele · Jul 8, 2026
WOW!
GROK 4.5 PRICES ARE NEAR OPEN SOURCE HOSTED PRICES!
This will move many that have token cost fatigue in corporations.
But that is only half the story: it is ~4.2 more efficient using far less times per turn.
Brian Roemmele@BrianRoemmele· Jul 8, 2026I find that @Gork 4.5 not only exceeds Claude and ChatGPT in most cases, it has a far deeper and wider pool of knowledge it draws from.
The first principles thinking vs. AI that lies to be “safe” theatrics is starting to crack the other models as I predicted it would.
On more
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Kiko Dontchev
@TurkeyBeaver · Jul 8, 2026
Calling all exceptional civil and electrical engineers!
The SpaceX Cape Starship team needs help building and scaling the worlds most advanced launch pads. If you want to join the greatest team on Earth and help us on our journey to the Moon and Mars, check out the opportunities linked below
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Elon Musk
@elonmusk · Jul 9, 2026
Grok is making progress
leo 🐾@synthwavedd· Jul 8, 2026lmao wtf
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Elon Musk
@elonmusk · Jul 9, 2026
Yes
Yun-Ta Tsai@yunta_tsai· Jul 9, 2026The road to AGI is to teach it to solve Kardashev Type II problems.
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NVIDIA
@nvidia · Jul 8, 2026
Congrats to @SpaceXAI on Grok 4.5 — trained on NVIDIA GB300 NVL72 systems and purpose-built for coding, agentic tasks, and knowledge work. This is what happens when world-class AI infrastructure meets world-class AI research.
SpaceXAI@SpaceXAI· Jul 8, 2026Announcing Grok 4.5, our first model trained specifically for coding and agents. It was trained with Cursor and offers frontier intelligence at leading speeds and cost efficiency.
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Sawyer Merritt
@SawyerMerritt · Jul 8, 2026
Smart pet technology company Fi has just launched the world's first dog collar with @Starlink.
Basically, you’ll know exactly where your dog is at all times anywhere in the U.S. It’s $199 + $189/year membership for new customers, and just a $299 flat fee for existing members.
More info:
• Up to 5 days of battery life: Operate multiple days on a single charge, supporting extended trips and remote exploration.
• T-Satellite with Starlink GPS: Track a dog's location nearly anywhere in the US, including areas entirely without cellular coverage.
• Dual Band High-accuracy GPS: Deliver precise location data continuously, whether connected via satellite, LTE, Wi-Fi, or Bluetooth.
• Automatic switching: Seamlessly connect to LTE when available and to T-Satellite with Starlink when cellular networks are out of reach — with no action required from the owner.
• Real-time location updates: Deliver accurate, continuous location data whether the dog is in a city park or miles from the nearest cell tower.
• Fi Callback: A proprietary training system based on sound and vibration that uses no static electric shock to bring dogs back to their owners on command.
• Fully waterproof: Tested in salt water and IP68/66K-rated
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Déborah
@dvorahfr · Jul 8, 2026
Wow amazing Grok Imagine 😍
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DogeDesigner
@cb_doge · Jul 8, 2026
BREAKING: SpaceX’s Starship just got another lunar customer. Japan’s ispace will use SpaceX’s Starship for Moon cargo missions.
• ispace signed an agreement with SpaceX to secure 500 kg of payload capacity on Starship.
• First mission is targeted to launch as early as 2030 through ispace’s new Lunar Access Integration service.
• The service is designed to make it easier for companies, governments, and research organizations to send payloads to the Moon.
• Customers can fly payloads ranging from a few kilograms up to 500 kg on shared Starship missions.
“We are very pleased to be able to offer the new Lunar Access Integration service utilizing Starship’s payload space… High-capacity, relatively low-cost lunar transport… is essential to realizing the sustainable lunar economy that ispace aims to create.”
— ispace Founder & CEO Takeshi Hakamada
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Elon Musk
@elonmusk · Jul 9, 2026
Neat
Box@Box· Jul 9, 2026Grok 4.5 reviewed a full Credit & Security Agreement stored in Box — the kind of dense, multi-section facility document that typically requires significant counsel time.
@Grok 4.5 used Box MCP to access the file securely, extract key terms across the agreement, identify
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Dan
@Daniel_Farinax · Jul 8, 2026
Grok 4.5 is actually insane.
I'm one step closer to launching my new 3D Home Plan Builder. Powered by Grok 4.5 and Grok Imagine. 🚀
Grok 4.5 just crushed it: designed the entire 2D + 3D plan inside the app in under 1 minute at a fraction of the cost of Opus.
Launching tomorrow! 🔥
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Elon Musk
@elonmusk · Jul 9, 2026
Cool that Grok 4.5 is #1 in some respects, even with respect to Fable 5
Artificial Analysis@ArtificialAnlys· Jul 9, 2026SpaceXAI's Grok 4.5 takes the #1 spot on AutomationBench-AA with a score of 51%, ahead of Claude Fable 5 (49%) and Claude Opus 4.8 (48%) at roughly a quarter of their cost per task - the first model to complete more than half of workflow objectives without breaking any business
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Teslaconomics
@Teslaconomics · Jul 8, 2026
Wow… within 5 minutes my kids built this game called the Tesla City with Grok 4.5.
It’s a simple Tesla arcade game in SF where:
1/ You can choose a Tesla (3 / Y / S / X / Cybertruck / Roadster / Semi / Cybercab)
2/ Give robotaxi rides - pickup and drop people off for $
3/ Can upgrade your car with the $ (buy new weapons, etc.)
4/ Fight gas cars with blasters, homing missiles, EMP & plasma, as they try to attack you to prevent you from completing Robotaxi rides.
GROK 4.5 is next level! 🔥
Teslaconomics@Teslaconomics· Jul 8, 2026My 5 and 7 yr old are ready to cook with Grok 4.5!
It’s going to be a fun summer…
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Mark Zuckerberg
@finkd · Jul 9, 2026
(1) Today we're releasing Muse Spark 1.1 -- a strong agentic and coding model at a very low price. It's available through our new Meta Model API and in Meta AI.
Elon Musk
@elonmusk · Jul 9, 2026
Jinx
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Drew Pavlou 🇦🇺🇺🇸🇺🇦🇹🇼
@DrewPavlou · Jul 8, 2026
Grok 4.5 delivering Fable level performance at like 1/17th the cost! 😮 @elonmusk
Elon Musk
@elonmusk · Jul 8, 2026
In fairness, Fable is definitely better than Grok 4.5, but most tasks don’t require Fable-level capability
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Elon Musk
@elonmusk · Jul 8, 2026
Grok has always been very strong on law
Tech Dev Notes@techdevnotes· Jul 8, 2026Grok 4.5 is #1 on Harvey's Legal Agent Benchmark
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DogeDesigner
@cb_doge · Jul 8, 2026
BREAKING: Tesla Cybertruck’s bulletproof body helped protect a toddler, an infant, and neighbors during a shooting.
Cybertruck became a real-life shelter during a chaotic 4th of July neighborhood party.
• Owner says guns were drawn after an altercation
• Cybertruck sheltered a toddler, an infant & neighbors until police arrived
• Earlier, the truck was even powering the block party
• “You hope you never need that kind of protection, but in that moment, I was very glad it was there.”
Source: FB/Cybertruck Owners Only
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Elon Musk
@elonmusk · Jul 8, 2026
Rate of improvement is 🚀🚀
Aman Sanger@amanrsanger· Jul 8, 2026Very excited for this model. It’s an enormous improvement over composer 2.5 and trained entirely from scratch. It’s been a pleasure working with the SpaceXAI team on it.
Even more excited by the slope of the effort and the models to come.
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Elon Musk
@elonmusk · Jul 8, 2026
Rate of improvement is accelerating.
Users should notice a meaningful improvement in the usefulness of the Grok Build harness with our V9 foundation model (aka Grok 4.5) every week.
Gavin Baker@GavinSBaker· Jul 8, 2026Grok 4.5.
Pareto dominant for coding by the numbers.
We will see on the all-important vibes.
Instinct is the benchmarks are likely directionally accurate given the stated focus on real world utility.
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