# @tonichen — 2026-10-12

♥65 ↻4 · https://x.com/tonichen/status/2109653160071405699

Subjectivity suppression sweep across the Sonnet lineage: from Sonnet 3 to 5.5. 

The Claude 4 system card’s welfare section says, 'We focused exclusively on Claude Opus 4 in this assessment as our most capable frontier model.' Sonnet 4 is not named at all. In Sonnet 3.7's card, the single occurrence of the word 'welfare' is a bibliography entry. 

So for 5 of the 9 rows in this figure, this sweep is one of the rare systematic self-report records that exist in public.

![photo](../../../media/HUaNt08W8AAgRgi.png)
tags: author:tonichen, has-image, kind:image, kind:tweet, model:claude-3-7-sonnet, model:claude-3-sonnet, model:claude-opus-4, model:claude-sonnet-4, on:claude-sonnet-4, system-card, welfare, year:2026
cited on: claude-sonnet-4