Grok

Opus

Elon Musk

<a href="https://yellow.com/news/spacex-elon-musk-cursor-60b-ai-push-acquisition" rel="noopener noreferrer nofollow">SpaceXAI and Cursor</a> plan to release their first jointly developed artificial intelligence model as soon as Wednesday, weeks after SpaceX moved to buy the code editor for $60 billion.
<h2 id="key-points">Key Points:</h2>
<blockquote>
 <ul>
 <li>The launch was delayed earlier this week so engineers could improve the model's efficiency.</li>
 <li>Internal testing compares the system with Anthropic's Claude Opus 4.8 and OpenAI's GPT 5.5.</li>
 <li>SpaceX agreed in June to acquire Cursor for $60 billion in an all-stock deal.</li>
 </ul>
</blockquote>
<h2 id="spacexai-cursor-model-launch">SpaceXAI Cursor Model Launch</h2>
The companies had planned to ship the model earlier this week but <a href="https://www.theinformation.com/briefings/exclusive-spacexai-plans-launch-new-model-cursor-soon-wednesday" rel="noopener noreferrer nofollow">pushed</a> the release back to improve its efficiency, a memo sent to staff shows. Internal evaluations measure the system against <a href="https://yellow.com/news/claude-opus-48-tops-gemini-gpt" rel="noopener noreferrer nofollow">Anthropic's Claude Opus 4.8</a> and <a href="https://yellow.com/news/gpt-5-5-outperforms-opus-agent-benchmarks" rel="noopener noreferrer nofollow">OpenAI's GPT 5.5</a>, two of the strongest models on the market today.
The release would be the first product to emerge from SpaceX's pending takeover of Cursor, the fast-growing AI code editor. SpaceX <a href="https://finance.yahoo.com/technology/ai/articles/spacexai-plans-launch-model-cursor-210200389.html" rel="noopener noreferrer nofollow">agreed</a> in June to buy the startup in an all-stock deal, and the transaction is expected to close in the third quarter. The model is set to ship inside both Cursor and Grok Build, the company's developer platform.
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<h2 id="grok-4-5-benchmark-claims">Grok 4.5 Benchmark Claims</h2>
Elon Musk<a href="https://x.com/elonmusk/status/2071184354756477041" rel="noopener noreferrer nofollow">posted</a> on Jun. 28 that Grok 4.5, an unreleased model built on the company's 1.5 trillion parameter V9 foundation, had entered private beta at SpaceX and Tesla. He said early evaluations showed performance close to, and perhaps exceeding, Anthropic's Opus tier, with Cursor data added to the model through supplemental training.
Those claims remain unverified.
No independent benchmark has scored Grok 4.5, and the only public evidence behind the comparison so far is Musk's own post. Cursor founder Michael Truell<a href="https://gizmodo.com/spacexai-will-reportedly-release-a-major-new-ai-model-this-week-2000782710" rel="noopener noreferrer nofollow">described</a> a Cursor-built model last month as the next phase of the company. He said at the time that the system would compete with frontier models from Anthropic and OpenAI.
<h2 id="spacex-stock-reaction">SpaceX Stock Reaction</h2>
Shares of SpaceX closed down 7% on Tuesday after the company asked regulators for permission to launch up to 100,000 third-generation Starlink satellites. The stock <a href="https://stocktwits.com/news-articles/markets/equity/spcx-stock-drops-after-spacex-seeks-approval-for-100k-gen3-starlink-satellites-eyes-new-ai-model-launch-with-cursor/cZmlyeyR7ZF" rel="noopener noreferrer nofollow">edged</a> up 2% in after-hours trading, and some retail traders called the coming model release a real catalyst for shares that have fallen 7% since the June listing.
The expected launch caps a rapid consolidation that began earlier this year. <a href="https://yellow.com/news/spacexai-arrives-musk-buries-xai" rel="noopener noreferrer nofollow">SpaceX absorbed xAI</a>, rebranded the unit as SpaceXAI, and then <a href="https://www.tradingview.com/news/reuters.com,2026:newsml_L4N4391T2:0-spacexai-plans-to-launch-new-model-with-cursor-as-soon-as-wednesday-the-information-reports/" rel="noopener noreferrer nofollow">announced</a> the Cursor purchase on Jun. 16. The company confirmed at the time that the two teams had already spent months jointly training a model on its Colossus supercomputer.
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SpaceXAI Wants A Cursor-Powered Claude Killer Before The $60B Deal Even Closes

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