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SpaceX’s Starship program returns to its roots with a new rocket ‘test tank’
SpaceX’s Starship rocket development program has returned to its early-2020 roots as teams work to assemble the first new ‘test tank’ built in South Texas in more than three months.
Just like its three predecessors, the newest test tank’s purpose is relatively simple: demonstrate – at full scale – the efficacy of SpaceX’s current manufacturing processes. Back when SpaceX built and tested the first two tank prototypes in January 2020, the company was in the midst of making big changes throughout its coastal Boca Chica, Texas Starship factory – a major leap forward compared to the methods used to build Starship Mk1. While the first tank made it to 7.1 bar (~103 psi) before failing, a second tank survived all the way up to 8.5 bar (~125 psi), as did a third separate test tank built about a month later. According to CEO Elon Musk, 8.5 bar is more than satisfactory for Starship pressure vessels to safely launch humans into orbit, offering a safety margin of more than 40%.
Most recently, Starship SN4 became the first full-scale prototype to replicate the results SpaceX achieved with its shorter test tanks, effortlessly reaching 7.5 bar (~110 psi) during a cryogenic pressure test completed just last month. Despite those myriad successes, however, SpaceX rarely stops moving forward and Musk has already hinted at improvements the company may be hoping to prove out with a fourth Starship test tank.
The most obvious reason to build a new test tank after the success of full-scale Starship prototype SN4 is a substantial change in the steel alloy SpaceX is building rockets out of in South Texas. CEO Elon Musk has teased such a shift for almost a full year and it appears to have happened right on time – if not ahead of schedule. SpaceX currently uses 301 stainless steel for Starship production, while the new material – discussed earlier by Musk and confirmed by inscriptions on the exterior of what would later become the fourth test tank – is a slightly different 304 steel “with higher ductility” (malleability).
It’s unclear if this is the custom-built “30X” alloy SpaceX was planning on creating, given that “304L” steel is an already-available commodity material that is slightly more durable and corrosion-resistant but less ductile and ~10% more expensive than 301. Regardless, changing to a new alloy would almost certainly benefit from real-world testing to confirm that behaves in the ways SpaceX expects it to, while also verifying that existing fabrication methods (particularly welding) still suffice.
The only other notable visual differences between Starship Test Tank #4 and its predecessors are small changes in welding. On the new tank’s dome and ring, SpaceX has removed wavy strips of metal known as a weld doublers, used to strengthen vertical welds on all previous ships and test tanks. While only realizing miniscule weight savings, the change is a visual confirmation that SpaceX is growing more confident in its weld quality, perhaps also signifying the introduction of a new kind of welding.
Last but not least, the circumferential weld joining Test Tank #4’s dome and ring (a dark horizontal line) appears to be centered on the ring, whereas the domes of previous ships and tanks have typically been attached to the upper or lower 20-30% of their respective rings. The purpose of this change is unknown.
Regardless, Test Tank #4 is currently in the midst of an hours-long cryogenic proof test and appears to be almost fully loaded with several hundred tons of liquid nitrogen. Check out the frosty tank live at the link below as we wait to see if the Starship hardware survives.
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Elon Musk
xAI’s Grok 3 partners with Oracle Cloud for corporate AI innovation
Elon Musk’s xAI partners with Oracle to deliver Grok 3 to enterprise users via OCI. The move boosts Grok’s reach.

xAI’s Grok 3 is partnering with Oracle Cloud to deliver its advanced AI model to corporate customers.
Oracle announced its collaboration with xAI earlier this week. The partnership leverages Oracle’s robust infrastructure to offer xAI’s Grok 3, positioning it as a transformative tool for business applications.
“Today, we announced xAI has selected Oracle to offer xAI’s Grok models via OCI Generative AI service for a wide range of use cases and will use OCI’s leading AI infrastructure to train and run inferencing for its next-generation Grok models,” said Clay Magouyrk, Executive Vice President at Oracle Cloud Infrastructure, via LinkedIn.
Oracle’s cost-effective AI capabilities will support xAI’s demanding workloads, enabling faster processing for enterprise users.
Oracle’s Karan Batta told Reuters: “Our goal here is to make sure that we can provide a portfolio of models – we don’t have our own.” Oracle will host Grok 3 alongside models from Meta, Mistral, and Cohere, ensuring corporate data remains secure within existing Oracle protections.
Oracle’s strategy focuses on integrating popular AI models into corporate software, and xAI’s Grok 3 enhances this portfolio. The collaboration expands Grok’s reach to businesses seeking secure, high-performance AI solutions for diverse use cases.
Elon Musk’s xAI launched Grok 3 in February. It competes with models from DeepSeek and OpenAI. Grok 3 is free for all X users, but features are limited. X offers Premium and Premium+ subscribers access to Grok 3’s advanced capabilities like DeepResearch and Think modes. Users who are not paid subscribers have access to Grok 3’s basic features.
Elon Musk’s companies have a longstanding relationship with Oracle. In 2018, Tesla appointed Oracle founder Larry Ellison to its board, a move Wedbush analyst Daniel Ives called a “home run appointment.”
In 2023, Ellison–who is no longer on Tesla’s board but still close with Musk–revealed plans for a Tesla Cybertruck police car.
“Our next-generation police car is coming out very soon,” Ellison said at the 2023 Oracle CloudWorld conference in Las Vegas. “It’s my favorite police car. It’s my favorite car, actually. It’s Elon’s favorite car.”
Grok 3’s integration into Oracle Cloud strengthens xAI’s position in the corporate artificial intelligence market. By combining Oracle’s infrastructure with Grok’s cutting-edge capabilities, this collaboration could redefine enterprise AI adoption, driving innovation across industries.
Elon Musk
Tesla Robotaxis are becoming a common sight on Austin’s public roads
Tesla Robotaxi sightings are becoming much more frequent ahead of its launch planned for this month.

Tesla Robotaxis are becoming a common sight on the public roads of Austin, Texas, as yet another test mule has been spotted near the company’s target launch date.
Just over a week ago, the first public sighting of a driverless Tesla Robotaxi was reported. The vehicle was an updated version of the Tesla Model Y, which will be the initial model used in the public deployment of the Robotaxi platform.
Throughout the past week, sightings have been more common, as people in Austin have been looking for the unique decal Tesla is placing on car doors to recognize the driverless vehicles (After all, Robotaxis are not as easy to recognize as driverless vehicles without the LIDAR unit on the roof like Waymo).
Yet another sighting of a Robotaxi was shared on social media today, just two days before CEO Elon Musk’s proposed launch date of June 22:
🚨 Tesla Robotaxis are being spotted all over Austin!
Here’s another spotted within the last hour: https://t.co/79l1RHpL5d pic.twitter.com/bOIlZYgs0U
— TESLARATI (@Teslarati) June 18, 2025
It is easy to tell that there is nobody in the driver’s seat of this vehicle. Tesla is using its white interior on this particular mule, making it incredibly simple to recognize that no human is controlling the car.
Whether Tesla will still meet the June 22nd deadline remains to be seen, but it is no secret that the company is prioritizing safety ahead of offering public rides.
Tesla will initially roll out the Robotaxi platform in Austin, but it has already started the regulatory process in other areas, specifically California.
The National Highway Traffic Safety Administration (NHTSA) is also helping to streamline the process for companies developing driverless vehicles by giving exemptions to automakers. It will make things much more efficient, benefiting Tesla and other car companies that have similar plans.
Tesla Robotaxi just got a big benefit from the U.S. government
Elon Musk
Elon Musk teases Tesla Optimus Gen 3 capabilities: ‘So many improvements’
If you thought Optimus Gen 2 was impressive, Tesla might have a surprise for you.

Elon Musk has teased that huge improvements are coming to Tesla’s Optimus humanoid robot, which is arguably the product that the company is developing with the most potential for everyday use by consumers and valuation increases from a financial perspective.
Optimus is still in the development stages, but Tesla has made great strides in its development over the past several years. It started as a simple idea that was unveiled with a human being in a spandex suit.
Tesla posts Optimus’ most impressive video demonstration yet
Just a few years later, Tesla has developed several humanoid robot prototypes that have made their way to influencers and have lent a helping hand around the company’s manufacturing facilities.
Tesla has already introduced two generations of Optimus, as the most recent release featured a vast number of improvements from the initial version.
The following is a list of things Tesla improved upon with Optimus Gen 2 compared to Gen 1:
- Tesla introduced a weight reduction of roughly 22 pounds, improving efficiency and agility
- Optimus Gen 2 had a walking speed that improved by 30 percent over Gen 1
- Tesla developed more capable hands that had 22 degrees of freedom, double that of Gen 1. This improved object handling
- Optimus Gen 2 had a 2-degree-of-freedom neck, as Gen 1’s was fixed
- Tesla integrated actuators and sensors for better performance. This includes things like foot force/torque sensing, articulated toe sections that are close to human foot geometry for better balance and movement
- Optimus Gen 2 has 28 degrees of overall freedom, improving flexibility from the first generation
- Tesla’s Optimus Gen 2 can do more than Gen 1, and has shown improved motor control and precision, doing things like squats, yoga poses, dancing, and even poaching an egg
These changes essentially brought Tesla closer to what will be the Optimus version that makes it to production. The company has plans to start production for the public in 2026, but some units will be manufactured for internal use within its factories as soon as this year. Tesla has said it could scale to 100,000 units or more by next year.
Musk also revealed to Teslarati recently that the company is in the process of building the production line that will bring manufacturing rates of Optimus to that level.
However, there is another design of Optimus coming, and Musk says it will feature “so many improvements”:
So many improvements to come in the next design of Optimus
— Elon Musk (@elonmusk) June 18, 2025
Tesla has said that Optimus will have the capability to perform tedious and time-consuming tasks like folding laundry, babysitting, cooking, walking the dog, and plenty of other things. However, it will be super impressive to see it do things that require true coordination, like threading a needle, for example.
Musk did not hint toward any specific developments that Tesla will aim for with Optimus Gen 3, but the sky is the limit, especially as it will be performing some manufacturing tasks across its factories.
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