{"id":22829421,"date":"2026-07-08T14:59:49","date_gmt":"2026-07-08T18:59:49","guid":{"rendered":"https:\/\/thenewstack.io\/?p=22829421"},"modified":"2026-07-08T15:05:41","modified_gmt":"2026-07-08T19:05:41","slug":"grok-45-opus-killer-launch","status":"publish","type":"post","link":"https:\/\/thenewstack.io\/grok-45-opus-killer-launch\/","title":{"rendered":"&#8220;Opus-class, but faster&#8221;: What Elon Musk says about beating Anthropic"},"content":{"rendered":"\n<p>SpaceXAI CEO Elon Musk announced on Wednesday that Grok 4.5 will be released publicly on Thursday, posting on X, &#8220;Based on strong positive feedback from customers in our beta test program, @SpaceXAI will make Grok 4.5 available to the public tomorrow. It is an Opus-class model, but faster, more token-efficient and lower cost.&rdquo;<\/p>\n\n\n\n<blockquote class=\"wp-block-quote is-layout-flow wp-block-quote-is-layout-flow\">\n<p>&#8220;It is an Opus-class model, but faster, more token-efficient and lower cost.&#8221;<\/p>\n<\/blockquote>\n\n\n\n<p>As a surprise to no one, the public launch comes just under two weeks of internal testing at SpaceX and Tesla. With a massive compute boost under the hood, Grok 4.5 runs on xAI&rsquo;s latest 1.5-trillion-parameter V9 foundation model, which makes Musk&rsquo;s reference to &ldquo;Opus-class&rdquo; especially telling. <\/p>\n\n\n\n<figure class=\"wp-block-embed is-type-rich is-provider-x wp-block-embed-x\"><div class=\"wp-block-embed__wrapper\">\n<blockquote class=\"twitter-tweet\" data-width=\"500\" data-dnt=\"true\"><p lang=\"en\" dir=\"ltr\">Based on strong positive feedback from customers in our beta test program, <a href=\"https:\/\/x.com\/SpaceXAI?ref_src=twsrc%5Etfw\" class=\"ext-link\" rel=\"external nofollow\" onclick=\"this.target=&#039;_blank&#039;;\">@SpaceXAI<\/a> will make Grok 4.5 available to the public tomorrow.<br><br>It is an Opus-class model, but faster, more token-efficient and lower cost.<\/p>&mdash; Elon Musk (@elonmusk) <a href=\"https:\/\/x.com\/elonmusk\/status\/2074740539874775163?ref_src=twsrc%5Etfw\" class=\"ext-link\" rel=\"external nofollow\" onclick=\"this.target=&#039;_blank&#039;;\">July 8, 2026<\/a><\/blockquote><script async src=\"https:\/\/platform.x.com\/widgets.js\" charset=\"utf-8\"><\/script>\n<\/div><\/figure>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"h-\"><\/h2>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"h-cursor-deal-fuels-training-data\">Cursor deal fuels training data<\/h2>\n\n\n\n<p>The model also reportedly received specialized supplemental training data from Cursor, the AI coding platform that SpaceX is in the midst of acquiring as part of a massive $60 billion deal. That could give Grok 4.5 an advantage on software engineering tasks by exposing it to high-quality coding workflows and developer interactions. Musk also teased that an even larger 2-trillion-parameter V-series model is due for an August release.&nbsp;<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"h-grok-4-5-s-trillion-parameter-engine\">Grok 4.5&#8217;s trillion-parameter engine<\/h2>\n\n\n\n<p>Not surprisingly, Musk referenced &ldquo;Opus-class&rdquo; based on the current success of competitor Anthropic&rsquo;s Claude Opus, which is currently on version 4.8. This is especially fitting timing given the recent drama surrounding Anthropic&#8217;s flagship model, Fable 5. Following a weeks-long standoff in which the federal administration imposed <a href=\"https:\/\/thenewstack.io\/us-gov-orders-anthropic-to-pull-fable-5-and-mythos-5-three-days-after-launch\/\" class=\"local-link\">strict export controls on Fable 5<\/a> over &#8220;jailbreak&#8221; national security concerns, Anthropic briefly pulled the model before <a href=\"https:\/\/thenewstack.io\/anthropic-fable-ban-lifted\/\" class=\"local-link\">redeploying it with stricter safety classifiers<\/a>. However, because Fable 5 now defaults back to Opus 4.8 whenever a security guardrail is tripped &mdash; and with access to Fable 5 tightening up &mdash; Musk must smell blood in the water.<\/p>\n\n\n\n<blockquote class=\"wp-block-quote is-layout-flow wp-block-quote-is-layout-flow\">\n<p>Musk must smell blood in the water.<\/p>\n<\/blockquote>\n\n\n\n<p>The launch is also an obvious defensive move to stem the bleeding in the user base. Recent <a href=\"https:\/\/seekingalpha.com\/news\/4612074-spacexais-grok-continues-to-lose-market-share-meta-ai-climbs-to-fourth-in-us-analysis\" class=\"ext-link\" rel=\"external nofollow\" onclick=\"this.target=&#039;_blank&#039;;\">Apptopia data<\/a> shows that the Grok app&#8217;s average daily users in the U.S. dropped by 28% since April, with its market share slipping below 9%.&nbsp;<\/p>\n\n\n\n<blockquote class=\"wp-block-quote is-layout-flow wp-block-quote-is-layout-flow\">\n<p>Recent Apptopia data shows that the Grok app&#8217;s average daily users in the U.S. dropped by 28% since April, with its market share slipping below 9%.<\/p>\n<\/blockquote>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"h-users-are-already-leaving-grok\">Users are already leaving Grok<\/h2>\n\n\n\n<p>Musk is aiming to steal back momentum with a cheaper, faster &#8220;Opus killer&#8221; on Thursday. We&rsquo;ll prepare for a massive, head-to-head tech showdown as OpenAI is heavily rumored to roll out its highly anticipated GPT-5.6 models.<\/p>\n\n\n\n<p><\/p>\n","protected":false},"excerpt":{"rendered":"<p>SpaceXAI CEO Elon Musk announced on Wednesday that Grok 4.5 will be released publicly on Thursday, posting on X, &#8220;Based<\/p>\n","protected":false},"author":3765,"featured_media":22829434,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"inline_featured_image":false,"footnotes":""},"categories":[14578,14518,13054],"tags":[],"coauthors":[14698],"class_list":["post-22829421","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-ai-models","category-ai-strategy","category-llm"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v27.6 (Yoast SEO v27.6) - https:\/\/yoast.com\/product\/yoast-seo-premium-wordpress\/ -->\n<title>&quot;Opus-class, but faster&quot;: What Elon Musk says about beating Anthropic - 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She covers artificial intelligence, developer tools, foundation models, and emerging technologies, with a particular focus on the companies and innovations shaping the future of AI, including OpenAI, Anthropic, Google, Meta, Microsoft, and Amazon. With more than two decades of professional writing and content experience, Caswell has held senior creative and editorial roles supporting major brands and technology organizations, including Amazon AWS, Walmart Health, and Bunim-Murray Productions. Her work spans technology, enterprise communications, content strategy, and journalism, giving her a unique perspective on how emerging technologies move from research labs into real-world adoption. She is known for translating complex technical developments into accessible reporting while maintaining a strong commitment to accuracy, source verification, and evidence-based journalism. Her reporting focuses on AI innovation, enterprise deployment, model releases, workplace transformation, developer ecosystems, and the broader impact of artificial intelligence on business and society. Caswell holds a B.S. in English with a concentration in Advertising from New York University and completed professional certification in prompt engineering and generative AI through MIT. Based in New Jersey, Caswell spends much of her time testing emerging AI tools, exploring how new technologies shape everyday life. She is also a lifelong runner and mother of three.","sameAs":["https:\/\/www.linkedin.com\/in\/amanda-caswell-745049a3\/","https:\/\/x.com\/AmandaCaswell"],"url":"https:\/\/thenewstack.io\/author\/amanda-caswell\/"}]}},"_links":{"self":[{"href":"https:\/\/thenewstack.io\/wp-json\/wp\/v2\/posts\/22829421","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/thenewstack.io\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/thenewstack.io\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/thenewstack.io\/wp-json\/wp\/v2\/users\/3765"}],"replies":[{"embeddable":true,"href":"https:\/\/thenewstack.io\/wp-json\/wp\/v2\/comments?post=22829421"}],"version-history":[{"count":15,"href":"https:\/\/thenewstack.io\/wp-json\/wp\/v2\/posts\/22829421\/revisions"}],"predecessor-version":[{"id":22829459,"href":"https:\/\/thenewstack.io\/wp-json\/wp\/v2\/posts\/22829421\/revisions\/22829459"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/thenewstack.io\/wp-json\/wp\/v2\/media\/22829434"}],"wp:attachment":[{"href":"https:\/\/thenewstack.io\/wp-json\/wp\/v2\/media?parent=22829421"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/thenewstack.io\/wp-json\/wp\/v2\/categories?post=22829421"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/thenewstack.io\/wp-json\/wp\/v2\/tags?post=22829421"},{"taxonomy":"author","embeddable":true,"href":"https:\/\/thenewstack.io\/wp-json\/wp\/v2\/coauthors?post=22829421"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}