ViralLoop

Mike Krieger@mikeyk

Excited to ship Claude Haiku 4.5 today! What was state-of-the-art 5 months ago (Sonnet 4) is now available at 1/3 the cost and 2x the speed. Even beats Sonnet 4 at computer use. Available today wherever you get your Claude :)

799 likes36 repliesPosted Oct 15, 2025

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Viral score

Based on absolute engagement — the platform doesn’t expose follower counts here, so large accounts score higher.

From likes, comments.

Why it worked

Opens with a short, self-contained line that is easy to take in at a glance.
Uses concrete numbers instead of vague claims, which makes it credible and quotable.
Short enough to read in full without expanding, which removes a step before the point lands.
Short sentences keep the pace up, so the reader never has to re-read a line.

The mechanics

Hook: Announcement
Structure: Hook → Landing
Style: Conversational paragraphs at a steady pace.
Tone: energetic, concrete
Mechanisms: Specificity
Written for: People building with AI

Analysis by ViralLoop — not written by the original author.

Post by Mike Krieger on X