First screen, captured 3 days ago. Open the video.

Claude Fable 5.2 and Mythos 5.2

What HN thinks

A model that builds an operating system in eight days, and a thread still arguing over whether anyone needs to read the code.

Fable barely beats Opus 5.5
Many users find little difference from Opus 5.5 on ordinary coding, though some say Fable clearly wins on design, architecture, data science and hard debugging.
Letting go of understanding is dangerous
A long subthread argues over whether productivity now means trusting output you don't understand; critics compare it to addiction and warn of brittle systems, while others liken it to managing teams or trusting compilers.
v1 is easy, v8 is hard
Skeptics note that demos like an agent-built OS hide the real pain of maintaining and scaling codebases, especially in embedded or high-availability work.

Consensus: Most agree Fable 5.2 is faster and more reliable than 5.1 and that Opus 5.5 is good enough for most everyday coding. Deep expertise still matters for steering and checking the models.

Recommended in the comments

agi-stylist ↗ (tool): It shows LLMs producing striking, easily editable procedural images instead of relying on image models.
superpowers (tool): One user has Fable write plans with it and hand implementation off to Opus.
Ironies of Automation ↗ (book): Cited as an earlier statement of the idea that spotting a model's counterfeits takes more expertise as models improve.

Summarised by Claude from the comment thread 3 days ago.

Points: 841
Comments: 960
Best rank: #1
Posted: 2026-11-09 by lairv
Category: AI & ML

anthropic claude claude-fable claude-mythos llm model-release benchmarks

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Captured 3 days ago. Click for the whole screenshot.

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