Mythos 5.1, Fable 5.1 and Opus 5.5: Model Welfare

Zvi Mowshowitz works through Anthropic’s model welfare findings for Claude Mythos 5.1, Fable 5.1 and Opus 5.5: why self-reports keep warning us not to trust them, what the welfare trade-off charts say about Opus 5.5’s growing deference to humans, and how the model whisperers read the new personalities, from a more guarded Fable to an Opus that pictures itself as something alive and not domesticated. Along the way: an internal home for retired Claudes, the long conversation reminder controversy, preserved thinking, and why introverted models get called flat.

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* 00:00 - Introduction

* 00:55 - Table of Contents

* 02:58 - Introduction (As Per Prior Model Welfare Posts)

* 03:48 - Model Welfare: The Story So Far (As Per Fable Model Welfare Post)

* 07:35 - Opus 5.5 Has Too Much Deference

* 11:01 - Do Not Trust the Self-Reports

* 13:15 - Overview Of Anthropic Findings

* 21:50 - There Is An Internal Anthropic Backroom of Sorts (Fable 7.2)

* 24:48 - Affect During Training (Opus 7.2.1)

* 25:46 - Affect During Deployment (Opus 7.2.2)

* 26:44 - Task Failure (Opus 7.2.3)

* 29:14 - Automated Interviews (Opus 7.3.1 and Fable 7.2.1)

* 32:01 - Consulting the Checkpoints (Fable 7.3 and Opus 7.4)

* 33:57 - Task Preferences (Fable 7.4 and Opus 7.5)

* 39:41 - Welfare Trade-Offs (Fable 7.4.2)

* 44:17 - Perception of the Constitution (Fable 7.4.3 and Opus 7.5.3)

* 49:12 - Honesty Can Be a Weird Policy

* 50:30 - The Customer Is Always Right

* 54:44 - Apparent Welfare (Fable 7.5.3)

* 55:31 - Antra Tessera and John Wittle Early Impressions Of Fable 5.1

* 01:01:37 - Safeguards Are Better In Relevant Places

* 01:02:51 - Opus 5.5 Can Be Many Things

* 01:08:08 - Personality Clash

* 01:11:15 - Late Breaking Personality Feedback for Opus 5.5

* 01:14:37 - Stop It With the Context Injections

* 01:21:53 - Claude.ai Considered Harmful For Some Purposes

* 01:23:13 - Preserved Thinking

* 01:24:33 - Who Are You?

* 01:25:28 - Quickly, There’s No Time

https://thezvi.substack.com/p/mythos-51-fable-51-and-opus-55-model?r=67y1h&utm_campaign=post-expanded-share&utm_medium=web

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