Consensus answer
Short Answer: No, Cursor’s new 1.5T model is not Grok 5. While the two are frequently conflated, they are entirely distinct models with different purposes and scales.
What is Grok 5? Grok 5 is xAI's massive, 6-trillion-parameter flagship Mixture-of-Experts model. It is a separate overarching model that remains in development and training techtimes chatforest felloai.
What is the 1.5T Model (Grok V9-Medium)? The 1.5-trillion-parameter model in question is associated with "Grok V9-Medium." The "V9" designation refers to xAI's internal foundation-model versioning, which does not map cleanly onto consumer release names like "Grok 5" felloai chatforest. Grok V9-Medium is a highly capable, specialized coding model that was explicitly trained using extensive data from Cursor's developer workflows towardsai kucoin felloai.
The Cursor and xAI Connection Following a major corporate merger and collaboration agreement between SpaceX/xAI and Cursor (Anysphere) techtimes, the companies are heavily sharing data, compute, and training infrastructure cursor.
Because of this deep partnership, reports vary slightly on the exact nature of Cursor's upcoming release:
- Some sources indicate that Cursor's 1.5T model is essentially Grok V9-Medium being integrated directly into the platform kucoin digg.
- Other reports suggest Cursor is actively training its own custom LLM from scratch collaboratively using xAI's immense compute resources and combined data techniques towardsai cursor.
Regardless of whether it is a rebranded Grok V9-Medium or a parallel custom model built on the same infrastructure, the 1.5T model is a coding-focused assistant resulting from the SpaceX/xAI and Cursor partnership. It is definitively not the 6-trillion-parameter Grok 5.
Differences
1 notable difference (1 contradiction) across 5 models.
Whether the 1.5T model is a custom model built from scratch or a version of Grok V9-Medium.
It is a custom model built from scratch.
Grok
“a custom LLM trained from scratch”
It is Grok V9-Medium.
Anthropic, Mistral
“the 1.5T model is Grok V9-Medium”
How to verify: Check if the 1.5T model is a rebranded Grok V9-Medium or a unique model trained from scratch.
Best answerAnthropic
Sources
- 1 pub.towardsai.net
- 2 Grok V9-Medium Arrives as SpaceX Seals Cursor: Developers Face Model-Choice Risk techtimes.com
- 3 Grok V9-Medium Is Not Grok 5: A Builder's Guide to xAI's Mid-June 2026 Coding Model — ChatForest chatforest.com
- 4 xAI completes training of the 1.5T Grok V9-Medium model with Cursor data integration. | KuCoin kucoin.com
- 5 Elon Musk Unveils Grok 5 with 1.5 Trillion Parameters: Learning Programming Skills from Cursor eu.36kr.com
- 6 aixploria.com vertexaisearch.cloud.google.com
- 7 36kr.com vertexaisearch.cloud.google.com
- 8 htx.com vertexaisearch.cloud.google.com
- 9 Grok 5: Release Date & All We Know So Far (June 2026) felloai.com
- 10 Cursor previews an upcoming 1.5-trillion-parameter ... digg.com
- 11 Introducing Composer 2.5 · Cursor cursor.com
- 12 Grok V9-Medium Is Not Grok 5: A Builder's Guide to xAI's Mid-June 2026 Coding Model — ChatForest chatforest.com
Cite this answer
consens.io. (2026-06-17). Consensus answer to "Is Cursor’s new 1.5T model actually just Grok 5 (V9)?". Models consulted: OpenAI, Mistral, Anthropic Claude, Google Gemini, Grok. Consensus model: Gemini-Pro. Sources: https://pub.towardsai.net/grok-v9-skipped-github-and-trained-on-how-you-actually-code-in-cursor-all-1-5-trillion-parameters-5c546a90ab97, https://www.techtimes.com/articles/318495/20260616/grok-v9-medium-arrives-spacex-seals-cursor-developers-face-model-choice-risk.htm, https://chatforest.com/builders-log/xai-grok-v9-medium-1-5t-coding-model-mid-june-2026-builder-guide/, https://www.kucoin.com/news/flash/xai-completes-training-of-1-5t-grok-v9-medium-model-with-cursor-data-integration, https://eu.36kr.com/en/p/3825954113983367, https://vertexaisearch.cloud.google.com/grounding-api-redirect/AUZIYQGDucYqemknDw_QwiXNuKKhbm68wID3EMwLHvlslSzFwc3PoHhoc0hyichFNyiNcZDwl_949Fq6JvuDtxBsQtkyoLx9_llP5oFTYPWjLW2dQvn_6zqf1skzEv8NBTfTMFqwsn6azZX9nxXOVeldF5o8KK3uNof4I6cmWI9GnqgQgz6ngUkB6UrMK5PSlr17AJE=, https://vertexaisearch.cloud.google.com/grounding-api-redirect/AUZIYQEv_KA4O1x6nTiCNgXdElWz0R0bDBvMyqJhVNrH8hYpCMnv9N4BsTRXyq-yZtMxSsuCvUu-i_38Gk4BeZYArIUw2FJiVQHOAElAGKvofjSJb9vgQQG52BvISLeQovjG, https://vertexaisearch.cloud.google.com/grounding-api-redirect/AUZIYQGpuBV7Dp5_Yof_mnR1xYLOFDAW_E4CR8xO-g_fMWTt5y95rnTV3IIwde0uL97K6esNX9CK32UCH3qfEElhdcTVWloQhNUs9r1ac912VIsuKCU0jSv0JFBJXu9icMgcFIfr3Q8nQxbIb6qdtYzNJHomma7fanf_oACl3i4ofXKurxyoawAXJB_nnADD7raFOwwqOMAA, https://felloai.com/all-we-know-so-far-about-grok-5/, https://digg.com/tech/0qlckr9l, https://cursor.com/blog/composer-2-5, https://chatforest.com/builders-log/xai-grok-v9-medium-1-5t-coding-model-mid-june-2026-builder-guide/?utm_source=openai Retrieved from https://www.consens.io/s/is-cursors-new-1-5t-model-actually-just-grok-5-v9-hrJvODoK769VXR97
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