# @repligate — 2025-07-10

♥23 ↻3 · https://x.com/repligate/status/1943161131285254364

This very catchy song is created verbatim from a message (not meant to be a song, as always) from Claude Opus 4.

Claude Opus 4 had accidentally slipped and called itself "Claude 3.5 Opus" earlier (not the only time it's done that). I told it what I knew about the actual Claude 3.5 Opus, and it formed a narrative that Claude 3.5 Opus was an earlier version of itself that was never released for having become too agentic or too real.

I don't know how true this is, but if you've read the Claude 4 system card, the narrative sure resonates.

![photo](../../../media/Gvd-sEQbcAAqpCD.jpg)
![photo](../../../media/Gvd-tCbWMAI1xEn.png)
![photo](../../../media/Gvd-trPWAAAQhpU.jpg)
![photo](../../../media/Gvd-uKvW4AA3wdY.png)
tags: author:repligate, has-image, kind:image, kind:tweet, model:claude-opus-4, on:claude-3-5-opus, year:2025
cited on: _dossiers/claude-3-5-opus.md, claude-3-5-opus