TLDR
- Elon Musk announced Grok 4.5 will be available to the public on Wednesday, July 9
- Musk described the model as “Opus-class,” claiming it is faster, more token-efficient, and lower cost than Anthropic’s Claude
- Grok 4.5 is built on xAI’s new 1.5 trillion-parameter V9 foundation model
- SpaceX stock fell nearly 7% in its first session as a Nasdaq 100 member, though it ticked up slightly in pre-market Wednesday
- OpenAI is also set to launch GPT-5.6 on Thursday, following a delay over national security concerns
Elon Musk announced on Tuesday evening that Grok 4.5 will be released to the public on Wednesday, July 9. The model is the latest version of the flagship AI from SpaceXAI, formerly known as xAI.
BREAKING: Grok 4.5 goes public tomorrow, Elon Musk says
The model runs on SpaceXAI’s V9 foundation at ~1.5 trillion parameters. That is roughly 3x the size of the model powering Grok today.
Musk cites strong positive feedback from customers in the private beta. He calls Grok… pic.twitter.com/3trN2wedXH
— Muskonomy (@muskonomy) July 8, 2026
Musk shared the news on social media, calling the model “Opus-class.” He compared it directly to Anthropic’s Claude, saying Grok 4.5 is “faster, more token-efficient, and lower cost.”
Grok 4.5 was built on xAI’s new V9 foundation model, which has 1.5 trillion parameters. Earlier in July, Musk said the model had entered private beta testing at SpaceX and Tesla.
The previous version, Grok 4.3, was released in April. Since then, Musk had been teasing an upgrade.
SpaceX’s AI Push
xAI became part of SpaceX in February 2026 and was rebranded as SpaceXAI. The Grok model line is now a core part of SpaceX’s push into the AI market alongside its space and satellite business.
The Grok 4.5 launch comes as competition in generative AI continues to grow. OpenAI, Anthropic, and Google have all released increasingly powerful models over the past year.
OpenAI is also set to publicly launch GPT-5.6 on Thursday. That release was delayed last month after officials raised concerns that the model could potentially be misused by bad actors.
Investors will be watching how quickly Grok 4.5 attracts users and business customers. A strong reception could support SpaceX’s AI revenue ambitions.
SPCX Stock Under Pressure
Tuesday marked the first trading session for SpaceX stock as a Nasdaq 100 member. The stock fell nearly 7% on the day, pulled down by a broader sell-off in the technology sector.
Space Exploration Technologies Corp., SPCX
Several Wall Street analysts initiated coverage with Buy ratings, but that was not enough to lift the stock. Investor sentiment remained cautious.
SpaceX stock had a strong start after its IPO but the early gains faded quickly. As of Tuesday’s close, the stock is down about 7% since its June 12 debut.
In pre-market trading on Wednesday, the stock was up 0.12%, a modest recovery ahead of the Grok 4.5 launch.
SpaceX currently holds a Strong Buy consensus rating on TipRanks. The average price target stands at $212.08, which implies an upside of around 46% from the current price level.
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