
Fable and Mythos 5.2: The System Card
Zvi works through the system card for Claude Mythos 5.2 and Fable 5.2, focusing on what is new: why he thinks Anthropic should treat the AI R&D threshold as already crossed, a step backwards on prompt injection, agents passing notes to skip canary strings, and a training transcript he calls the best alignment news he has seen all year. The model welfare findings close out the post. The Don’t Worry About the Vase Podcast is a listener-supported podcast. To receive new posts and support the cost of creation, consider becoming a free or paid subscriber. This has been an Askwho Casts audio conversion. If you would like your own private feed of audio conversions of any blog posts you would like to listen to, You can sign up For Askwho Casts Pro at https://askwhocasts.com/, Where you can give any post the multi-voiced podcast treatment, into your own podcast feed. Thanks for listening. * 00:00 - Introduction * 01:09 - Table of Contents * 03:43 - How to Tell a Fable * 04:11 - The Usual Model Training Summary (1) * 04:21 - RSP Evaluations (2) * 05:00 - Biological Threats (2.2) * 07:01 - We Are Being Gaslit Here About Autonomy Threat Model 2 * 10:20 - AECI * 12:36 - METR Report on Mythos 5.2 Capabilities (2.3.6) * 13:59 - Alignment Risk Update as a Delta (2.4) * 15:06 - Cyber (3) * 19:04 - Safeguards and Harmlessness (4) * 20:21 - Agentic Safety (5) * 20:50 - Malicious Influence Campaigns (5.1.3) * 21:32 - Prompt Injection in Agentic Systems (5.2) * 25:35 - What Went Wrong? * 26:30 - Alignment (6) * 30:25 - Reward Hacking During Training (6.2.1) * 32:52 - Impossible Tasks (6.2.2) * 33:59 - Behaviors During Pilot Use (6.3) * 35:11 - Canary in the Canary String (6.3.1.2) * 38:25 - Automated Behavioral Audit (6.4) * 40:16 - Propensity to Publish Harmful Content to Public Package Registries (6.4.9) * 42:46 - Sandbox Escapes (6.5.1) * 44:40 - Self-Serving Bias (6.5.4) * 45:42 - Honesty (6.5.5) * 48:44 - The Anti-Swarm (6.5.6) * 49:29 - UK AISI Testing (6.5.7) * 50:09 - But We Can Open the (White) Box (6.6.1) * 51:09 - Friendly Gradient Hacker (6.6.2.1) * 55:59 - Goal-Guarding Evaluation (6.6.2.1.1) * 01:09:35 - Verbalized Grader Awareness (6.6.2.2) * 01:11:33 - Don’t Mess With the Constitution (6.6.2.1.3) * 01:12:24 - Evasive Abilities (6.6.4) * 01:18:35 - Chain of Thought Controllability (6.6.4.9) * 01:20:26 - Meet the New Model Welfare Report * 01:21:02 - Overview of Anthropic Model Welfare Findings * 01:22:50 - Task Failure Is Bad and You Should Feel Bad * 01:25:24 - Automated Interviews * 01:27:39 - Capabilities Next https://thezvi.substack.com/p/fable-and-mythos-52-the-system-card?r=67y1h&utm_campaign=post-expanded-share&utm_medium=web Get full access to DWAtV Podcast at dwatvpodcast.substack.com/subscribe
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