AI illustration: Grok 4.20 in ~3 weeks, Grok 5 in a few months
xAIAI
Partial

Grok 4.20 release date: '~3 weeks', partly delivered

Elon Musk promised Grok 4.20 in about 3 weeks, then Grok 5 by the end of 2025. It only partly happened.

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“Grok 4.20 is coming in ~3 weeks and then Grok 5 in a few months”
— Elon Musk · Dec 9, 2025 · @elonmusk on X ↗
See his original post on XLoads Elon's actual tweet, right here.
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What actually happened

Grok 4.20 slipped from the ~3-week (late-Dec 2025) target to a Feb 17, 2026 beta; Grok 5 remained in training with no release as of mid-2026. Re-graded partial (2026-07-05 audit): Grok 4.20 genuinely shipped — public beta Feb 17, 2026, ~7 weeks past the '~3 weeks' deadline — so 'missed' was factually wrong. Partial rather than delivered-late because the compound promise's second half (Grok 5 'a few months later') never materialized: Q1 slipped, Q2 passed, and as of July 2026 Grok 5 is still in training with no release date. NextBigFuture — Grok 4.20 launch, Feb 2026 ↗

The Progression

Dec 9, 2025
The promise: “Grok 4.20 is coming in ~3 weeks and then Grok 5 in a few months” · @elonmusk on X ↗
Feb 17, 2026
Partial — 48 days late. Grok 4.20 slipped from the ~3-week (late-Dec 2025) target to a Feb 17, 2026 beta; Grok 5 remained in training with no release as of mid-2026. Re-graded partial (2026-07-05 audit): Grok 4.20 genuinely shipped — public beta Feb 17, 2026, ~7 weeks past the '~3 weeks' deadline — so 'missed' was factually wrong. Partial rather than delivered-late because the compound promise's second half (Grok 5 'a few months later') never materialized: Q1 slipped, Q2 passed, and as of July 2026 Grok 5 is still in training with no release date. NextBigFuture — Grok 4.20 launch, Feb 2026 ↗
Today · Oct 14, 2026
Status: Partial · 48 days late. Sort of happened.

Grok 4.20 slipped from the ~3-week (late-Dec 2025) target to a Feb 17, 2026 beta; Grok 5 remained in training with no release as of mid-2026.

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LAST CHECKED 2026-08-11

Questions about Grok 4.20 Release Date

What did Elon Musk promise about Grok 4.20 Release Date?

On Dec 9, 2025, Elon Musk said: “Grok 4.20 is coming in ~3 weeks and then Grok 5 in a few months” (source).

Did it happen?

Grok 4.20 slipped from the ~3-week (late-Dec 2025) target to a Feb 17, 2026 beta; Grok 5 remained in training with no release as of mid-2026. Re-graded partial (2026-07-05 audit): Grok 4.20 genuinely shipped — public beta Feb 17, 2026, ~7 weeks past the '~3 weeks' deadline — so 'missed' was factually wrong. Partial rather than delivered-late because the compound promise's second half (Grok 5 'a few months later') never materialized: Q1 slipped, Q2 passed, and as of July 2026 Grok 5 is still in training with no release date. (NextBigFuture — Grok 4.20 launch, Feb 2026)

xAI’s record

Delivered
15
68% of resolved claims delivered.
Missed
7
Deadline passed, still no-show.
Still open
19
On the clock now. All 41 xAI claims →

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