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SpaceX's Elon Musk reveals next Starship's Raptor engines, explains latest failure
SpaceX CEO Elon Musk took to Twitter to better explain what happened when the latest full-scale Starship prototype failed during one of its first tests, while later revealing the rocket engines set to power a future prototype’s first flight.
On April 3rd, SpaceX initiated the third full-scale Starship prototype’s first cryogenic (ultra-cold) pressure test by loading the ~30m (100 ft) tall rocket’s upper propellant tank with what was likely 400+ metric tons (~900,000 lb) of liquid nitrogen. For several hours, liquid nitrogen – a chemically-neutral propellant simulant – was loaded and offloaded several times. Finally, around 2:07 am local (07:07 UTC), the liquid oxygen tank below the methane tank abruptly crumpled, reminiscent of a plastic bottle with the air partially sucked out of it. After several long seconds of gradual crumpling, gravity did what gravity does and pulled the heavy upper tank to the ground, shredding the rest of the rocket’s thin steel skin.
Both unfortunate and a positive development, Musk has recently confirmed Teslarati’s earlier speculation that based on videos of the anomaly, a bad test design and operator error(s) – rather than a technical fault of the rocket itself – could have been the cause of Starship SN3’s failure. In other words, barring future operator error-related failures, Starship SN3’s second cryogenic test went quite well and should mean no delays to Starship SN4’s ongoing assembly.
Particularly in light of Elon Musk’s statement that operator error and a bad test design caused Starship SN3’s failure, the ship’s April 3rd performance was quite impressive. That SN3 remained vertical for several seconds after its aft tank crumpled and likely lost pressure – despite carrying a load equivalent to a fully-loaded Boeing 747 passenger jet – suggests that the vehicle’s structure is extremely robust.
In his explanation, Musk revealed that the rocket failed because the lower (liquid oxygen) tank had not been pressurized enough to withstand the stress of a methane tank fully loaded with liquid nitrogen. Musk’s description almost makes it sound like one or several people failed to account for the fact that liquid nitrogen is nearly 25% heavier than the cryogenic methane it was simulating.
Thankfully, while a prototype likely worth several million dollars and at least a month of work was lost, that means that SpaceX should be able to move on to SN4 with confidence – at least as long as it can rectify whatever allowed those operator mistakes to occur.

In the same Twitter session, Musk – presumably burning the late-night oil at SpaceX’s Boca Chica, Texas Starship factory – also posted a photo showing three operational Raptors in the same frame, a definite first for the cutting-edge rocket engine. Had Starship SN3 survived its cryogenic proof tests last week, SpaceX’s plan was to install and static fire either one or three Raptor engines. A successful static fire campaign would have then been followed soon after by a full-scale Starship’s inaugural flight test, potentially seeing the ship fly as high as Starhopper’s final August 2019 hop.
Now, while Musk says SpaceX may still “reuse much of [SN3’s] thrust section,” the company’s Starship test plan will now rely on SN4 – the next full-scale prototype. It’s far more likely that SN4 will reuse almost no structural aspects of SN3, but even that might cause just a few weeks of delays. Based on a particular assembly step completed on April 4th, Starship SN4 is only four weeks away from the launch pad under the assumption of zero improvements to the speed of production, assembly, and outfitting. Knowing SpaceX, SN4 could be fully stacked and outfitted even sooner.
For now, it looks like we’ll thus have to wait at least a few more weeks to see Starship attempt another cryogenic proof test and – potentially – breathe its first fire with one or several Raptor engines.
Elon Musk
Tesla teases new AI5 chip that will revolutionize self-driving
Elon Musk revealed new information on Tesla’s AI5, previously known as Hardware 5, chip, for self-driving, which will be manufactured by both Samsung and TSMC.
The AI5 chip is Tesla’s next-generation hardware chip for its self-driving program, Optimus humanoid robots, and other AI-driven features in both vehicles and other applications. It will be the successor to the current AI4, previously known as Hardware 4, which is currently utilized in Tesla’s newest vehicles.
Elon Musk reveals Tesla’s HW5 release date, and that it won’t be called HW5
AI5 is specially optimized for Tesla use, as it will work alongside the company’s Neural Networks to focus on real-time inference to make safe and logical decisions during operation. It was first teased by Tesla in mid-2024 as Musk called it “an amazing design” and “an immense jump” from the current AI4 chip.
It will be roughly 4o times faster, have 8 times the raw compute, 9 times the memory capacity, 5 times the memory bandwidth, and 3 times the efficiency per watt.
It will be manufactured by both TSMC and Samsung at their Arizona and Texas fab locations, respectively.
Here’s what Musk revealed about the chip yesterday:
Different Versions
Samsung and TSMC will make slightly different versions of the AI5 chip, “simply because they translate designs to physical form differently.” However, Musk said the goal is that its AI software would work identically.
This was a real concern for some who are familiar with chip manufacturing, as Apple’s A9 “Chipgate” saga seemed to be echoing through Tesla.
Back in 2015, it was found that Apple’s A9 chips had different performances based on who manufactured them. TSMC and Samsung were both building the chips, but it was found that Samsung’s chips had shorter battery life than TSMC-fabricated versions.
Apple concluded that the variance was about 2-3 percent. However, Tesla will look to avoid this altogether.
Release and Implementation into Vehicles
Musk said that some samples will be available next year, and “maybe a small number of units” would equip the chip as well. However, high-volume production is only possible in 2027.
This means, based on Tesla’s own timeline for Cybercab production in Q2 2026, early iterations of the vehicle would rely on AI4. Many believe AI4 can be utilized for solved self-driving, but the power of subsequent versions, including AI5 and beyond, will be more capable.
AI6 and Beyond
AI6 will utilize the same fabs as AI5, but there would be a theoretical boost in performance by two times with this version.
AI6 could enter volume production by mid-2028. However, AI7, which Musk only briefly mentioned, “will need different fabs, as it is more adventurous.”
News
Tesla makes a splash at China’s Import Expo with Cybercab and Optimus
It appears that Elon Musk’s vision is something that still resonates with people.
Tesla’s fully autonomous Cybercab made its first appearance in the Asia-Pacific region at the 8th China International Import Expo (CIIE) in Shanghai on November 5, becoming the centerpiece of an event that drew 12 of the world’s leading automakers.
The new model offers a glimpse into Tesla’s driverless ride-hailing future, and based on the reception of the event’s attendees, it appears that Elon Musk’s vision is something that still resonates with people.
Tesla showcases its driverless vision with the Cybercab
At this year’s expo, themed “Mobility, Infinite Possibilities,” Tesla’s futuristic two-seat Cybercab stood out as a showcase of complete autonomy. According to Tesla staff, the vehicle lacks both a steering wheel and pedals, relying entirely on Tesla’s cameras and an end-to-end neural network designed for full self-driving.
The Cybercab will ultimately serve in the company’s expanding Robotaxi fleet, a cornerstone of Elon Musk’s long-promised autonomous mobility network. During the event, a Tesla employee emphasized that the Cybercab’s model’s compact layout reflects real-world usage, as 92% of trips involve just one or two passengers, as noted in a Sina News report. Trips that require more passengers could easily be handled by the Model 3 and Model Y, which are both capable of seating four, or even five passengers.
Optimus, Tesla’s humanoid robot that is designed for both home and industrial use, was also present at the event. Similar to the Cybercab, Optimus also attracted quite a lot of attention from the event’s attendees.
Automakers reaffirm commitment to Chinese innovation
Other global automakers, including Volkswagen, Mercedes-Benz, and Honda, also displayed cutting-edge concept cars and intelligent systems, but few captured the same interest as Tesla’s bold showcase of its autonomy and robotics.
Beyond new models, this year’s CIIE highlighted a renewed focus on local innovation and collaboration in China’s rapidly evolving EV landscape. Executives from Volkswagen, Audi, and General Motors reaffirmed that their long-term strategies center on “in China, for China,” strengthening R&D operations and forming tech partnerships with domestic suppliers.
Elon Musk
Tesla gets big nod on Musk comp package from Charles Schwab
“Schwab Asset Management’s approach to voting on proxy matters is thorough and deliberate. We utilize a structured process that focuses on protecting and promoting shareholder value.”
Tesla got a big nod of approval on CEO Elon Musk’s newly-proposed compensation package from Wall Street firm Charles Schwab after many shareholders believed the company was aiming to go against the new pay structure for its frontman.
Yesterday, we reported on many Tesla investors threatening to leave Charles Schwab as their broker after it was assumed the firm would vote against Musk’s pay package. The impression was that Schwab would utilize the same voting strategies as Glass Lewis and Institutional Shareholder Services (ISS), which both said they would vote against the new compensation package.
However, Schwab reached out to TESLARATI directly yesterday to confirm that it had not made any statement on which way it would vote. It then confirmed to us that it would vote to support Musk’s pay package:
UPDATE: a Charles Schwab spokesperson has reached out to TESLARATI with the following statement:
“Schwab Asset Management’s approach to voting on proxy matters is thorough and deliberate. We utilize a structured process that focuses on protecting and promoting shareholder value.… https://t.co/gG9iFhTgdJ
— TESLARATI (@Teslarati) November 4, 2025
The statement to TESLARATI said:
“Schwab Asset Management’s approach to voting on proxy matters is thorough and deliberate. We utilize a structured process that focuses on protecting and promoting shareholder value. We apply our own internal guidelines and do not rely on recommendations from Glass Lewis or ISS. In accordance with this process, Schwab Asset Management intends to vote in favor of the 2025 CEO performance award proposal. We firmly believe that supporting this proposal aligns both management and shareholder interests, ensuring the best outcome for all parties involved.”
Schwab also came out with a new statement just after that would be released to the public, stating that its delayed decision on the compensation package was due to its “structured process that focuses on protecting and promoting shareholder value.”
The firm uses a three-step program to determine its decision on a key vote like this one:
- board composition and quality
- actions a board has taken to drive strategy, deliver performance and manage relevant risks
- clarity and accessibility of reporting on key issues
It then said it applies its own internal guidelines and does not rely on recommendations from other firms, like Glass Lewis or ISS.
It continued:
“In accordance with this process, Schwab Asset Management intends to vote in favor of the 2025 CEO performance award proposal. We firmly believe that supporting this proposal aligns both management and shareholder interests, ensuring the best outcome for all parties involved.”
Charles Schwab then received kudos from the Tesla community on their decision to vote for Musk to receive this compensation package.
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