The newest Grok (open weights) model is Grok 2.5, released on August 23, 2025. It has been 409 days since then, more than a year without a release, so the line is inactive; a new release would bring it back.
How long it has been since the last release against the line's usual gap and its recent ones — the rhythm, not a date.
Every Monday, only when something shipped: the AI models that came out, what each one changed, and which lines are due next.
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Newest first — what each version changed versus the one before, in xAI's own numbers.