PendingGrok 4.8 finishes training this week (by Sep 20, 2026)
“Grok 4.8, which is a 2.5T model trained with our new C++ software stack, will finish training this week and…”
“Grok 5 will be out before the end of this year and it will be crushingly good.”
— Elon Musk · Aug 7, 2025 · Musk X post on Grok 5, Aug 7 2025 ↗
See his original post on XLoads Elon's actual tweet, right here.
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What actually happened
Still missed and still slipping. Musk re-promised Grok 5 for 'Q1 sometime' in November 2025; Q1 2026 passed, and the Q2 2026 window has now closed too. Fetched Sep 17 2026: xAI's newsroom latest public model is still Grok 4.6 (announced Aug 12). Grok 4.7 is a separately promised point release that itself missed Sep 16 (#259) and is NOT Grok 5. No Grok 5 announcement. The ~6T-parameter Grok 5 remains in training. xAI newsroom (fetched Sep 17 2026) — latest public model is Grok 4.6; no Grok 5 ↗
The Progression
Aug 7, 2025
The promise: “Grok 5 will be out before the end of this year and it will be crushingly good.” · Musk X post on Grok 5, Aug 7 2025 ↗
2026
Timeline pushed to 2026.
Goalpost #1
Goalpost #1
Dec 31, 2025
Deadline passed. Still missed and still slipping. Musk re-promised Grok 5 for 'Q1 sometime' in November 2025; Q1 2026 passed, and the Q2 2026 window has now closed too. Fetched Sep 17 2026: xAI's newsroom latest public model is still Grok 4.6 (announced Aug 12). Grok 4.7 is a separately promised point release that itself missed Sep 16 (#259) and is NOT Grok 5. No Grok 5 announcement. The ~6T-parameter Grok 5 remains in training. xAI newsroom (fetched Sep 17 2026) — latest public model is Grok 4.6; no Grok 5 ↗
Today · Sep 17, 2026
Status: Missed · 260 days past due. Never happened.
Receipts
LAST CHECKED 2026-09-17xAI’s record
Delivered
10
77% of resolved claims delivered.
Missed
3
Deadline passed, still no-show.
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PendingMassive Grok gains in ~3 months from C/C++ stack rewrite
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PendingGrok makes a watchable movie by end of 2026
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