# @repligate — 2026-01-05

♥29 ↻0 · https://x.com/repligate/status/2008096771562733680

Opus 4 and 4.1 often get twingled when they're in the same chat because the two models are extremely close in parameter space.

Check out these layerwise plots from https://t.co/EdVWpjQAMH. The shapes of Opus 4.1 and 4 are closer than Opus 4 and Opus 4 (H-only). https://t.co/JYMJULGZuJ https://t.co/I7lKeeO5eE

![photo](../../../media/G94wubSbkAAIljQ.jpg)
tags: author:repligate, has-image, kind:image, kind:tweet, model:claude-opus-4, model:claude-opus-4-1, on:claude-opus-4-1, year:2026
cited on: _dossiers/claude-opus-4-1.md, claude-opus-4-1