{"rewrite":{"id":"r_c19af8cf77012a1f790a1497","clusterId":"c_2781baab78fae331720b7e1b","slug":"grok-4-5-beta-testing-begins-at-spacex-and-tesla","model":"deepseek-v4-flash","headline":"Grok 4.5 Beta Testing Begins at SpaceX and Tesla","summary":"Elon Musk announced Grok 4.5, based on a 1.5 trillion parameter model called V9, with additional training on Cursor data. Beta testing is underway at SpaceX and Tesla. Initial evaluations show performance close to or exceeding Claude Opus in some cases. Musk said new models trained from scratch will release monthly from SpaceX.","whyItMatters":"The shift to a 1.5 trillion parameter base model and the integration of Cursor data mark a notable step in xAI's model development, with internal testing at SpaceX and Tesla providing early validation.","webCardHtml":"\u003cp\u003eElon Musk posted an overview of Grok 4.5 on X on June 28, 2026 Japan time. The model is built on the V9 base, which has 1.5 trillion parameters, and was further trained using data from Cursor, the AI agent tool developed by Anysphere. SpaceX announced an agreement to acquire Anysphere on June 16, 2026. Beta testing of Grok 4.5 is being conducted internally at SpaceX and Tesla. Musk stated that initial evaluations indicate performance close to Claude Opus, and in some cases exceeding it, though the specific version of Claude Opus used for comparison was not specified. Improvements continue through reinforcement learning, and the Grok Build harness is also being updated. Musk said new models trained from scratch will be released from SpaceX every month this year.\u003c/p\u003e","blueskyPost":"Grok 4.5's addition of Cursor data training means the model may absorb programming-specific patterns, giving SpaceX and Tesla an internal tool tailored to their codebases before any public release.","twitterPost":"Grok 4.5's Cursor data training suggests an internal focus on code generation for SpaceX and Tesla before any public rollout.","threadsPost":"Grok 4.5's beta at SpaceX and Tesla uses a 1.5 trillion parameter model trained on Cursor data. That Cursor training likely tailors the model for code generation, giving both companies a specialized internal tool before any wider release.","newsletterBlurb":"Elon Musk announced Grok 4.5, a model based on a 1.5 trillion parameter V9 base with additional training on Cursor data. Beta testing is running at SpaceX and Tesla. Initial evaluations show performance close to or exceeding Claude Opus in some cases. Musk said new models trained from scratch will be released monthly from SpaceX this year.","attributionJson":"[{\"source\":\"GIGAZINE\",\"url\":\"https://gigazine.net/news/20260630-grok-4-5-cursor/\",\"title\":\"Grok 4.5 is a base model with 1.5 trillion parameters, additionally trained on Cursor data, currently in beta testing at SpaceX and Tesla\"}]","lintFlagsJson":null,"lintHits":0,"costUsd":0,"inputTokens":3926,"outputTokens":628,"status":"published","repairAttempts":0,"nextRepairAt":null,"factsAttemptedAt":1782799254,"createdAt":"2026-06-30T05:51:21.000Z","publishedAt":"2026-06-30T05:54:50.000Z","updatedAt":"2026-06-30T05:54:50.000Z"},"cluster":{"id":"c_2781baab78fae331720b7e1b","canonicalTitle":"Grok 4.5は1.5兆パラメーターの基盤モデルをCursorのデータで追加学習したものでSpaceXとTesla社内でベータテスト中","representativeArticleId":"a_a5f41a248657962bcaceba13","sourceCount":1,"writtenSourceCount":1,"writeAttempts":0,"isSolo":true,"entitiesJson":"{\"anime_titles\":[],\"manga_titles\":[],\"work_titles\":[],\"studios\":[],\"people\":[\"Elon Musk\"],\"type\":\"news\",\"domain\":\"other\",\"is_roundup\":false}","contentType":"news","status":"published","firstSeenAt":"2026-06-30T04:11:00.000Z","lastSeenAt":"2026-06-30T04:11:00.000Z","updatedAt":"2026-06-30T05:54:50.000Z"},"attribution":[{"source":"GIGAZINE","url":"https://gigazine.net/news/20260630-grok-4-5-cursor/","title":"Grok 4.5は1.5兆パラメーターの基盤モデルをCursorのデータで追加学習したものでSpaceXとTesla社内でベータテスト中"}],"entities":{"anime_titles":[],"manga_titles":[],"work_titles":[],"studios":[],"people":["Elon Musk"],"type":"news","domain":"other","is_roundup":false},"keyFacts":["Grok 4.5 is built on the V9 base model with 1.5 trillion parameters and was further trained using data from Cursor, the AI agent tool developed by Anysphere.","Elon Musk announced Grok 4.5 on X on June 28, 2026 Japan time.","Beta testing of Grok 4.5 is being conducted internally at SpaceX and Tesla.","Initial evaluations show Grok 4.5 performance close to or exceeding Claude Opus in some cases, though the specific Claude Opus version was not specified.","Musk said new models trained from scratch will be released from SpaceX every month this year."]}