Show Notes
At the time of its release Claude Fable 5.1 was, by a healthy margin, the most capable publicly available AI model in the world.
As per usual, we have a 200+ page model card, and the assessments start there.
We have now done a lot of these, including recently for Mythos 5 and Opus 5. Also highly relevant is the Anthropic August 2026 Risk Report. These are now frequent, so my report focuses on areas of change.
This post strives to be broadly readable, but assumes some familiarity with system cards, which describe the key safety, alignment and model welfare properties of newly released AI models. If something confuses you, ask Fable, Opus or Sol.
Mythos 5.1 and Fable 5.1 are the same model under the hood, except that Fable has classifiers superimposed on it. Most of what is said about one applies to both of them.
As usual, model welfare concerns will be discussed in a distinct post, as will capabilities, so this only covers sections 1-6 plus a few bio benchmarks from section 8.
Early word is that Fable 5.1 is a substantial but incremental improvement on Fable 5, with the [...] --- Outline: (02:21) Executive Summary of Their Executive Summary (04:24) RSP Evaluations (2) (10:25) Alignment Risk Update (2.4) (11:10) Cyber (3) (14:15) Safeguard Robustness (3.5) (16:14) Mundane Safeguards and Harmlessness (4) (18:14) Agentic Safety (5) (20:17) Prompt Injection Is Approaching Solved (22:19) The Remaining Problem With Prompt Injections Is The Classifiers (23:02) Alignment (6) (23:36) Key Reported Findings (6.1.2) (27:13) Oh My Lord Training Environments Had Some Issues (6.3.2) (29:22) Potential Blind Spots of Our Automated Behavioral Audit (6.4.1) (30:53) Automated Alignment Test Results (6.4.2) (32:20) Honesty (33:26) White Box Analysis (6.6.1) (35:03) Scheduling Going Forward ---
First published:
September 4th, 2026
Source:
https://www.lesswrong.com/posts/m7SZLkkxoeus3eFP8/claude-fable-5-1-and-mythos-5-1-the-system-card
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Narrated by TYPE III AUDIO.
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