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Matt Shumer on AI · ViralLoop

Post by Matt Shumer on X

Matt Shumer@mattshumer_

This is yet another example of Claude Mythos’s incredible hacking capabilities. I expect we’ll see more examples and independent evaluations in the coming weeks that make clear just how powerful (and dangerous, in the wrong hands) this model could be.

182 likes30 repliesPosted Apr 13, 2026

View the original on X Written by Matt Shumer. Captured Sep 4, 2026.

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Based on absolute engagement — the platform doesn’t expose follower counts here, so large accounts score higher.

From likes, comments.

Why it worked

Opens with a short, self-contained line that is easy to take in at a glance.
The opening line stands alone, so it reads completely before the post is expanded.
Written from experience rather than as advice, which is harder to argue with.
Short enough to read in full without expanding, which removes a step before the point lands.

The mechanics

Hook: Plain observation
Structure: Hook → Landing
Style: Conversational paragraphs at a steady pace.
Tone: personal
Written for: People building with AI

Analysis by ViralLoop — not written by the original author.

Topics

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More from Matt Shumer

Fable 5.1 is a massive upgrade, but the bigger story is how much cheaper it is. Cache reads in particular are 75% cheaper! This puts it much closer to the pricing of GPT-5.6-Sol, while being a much more capable model.

This is so damn cool! And by the time it ships, models will be insanely good at setting up RL runs to train this autonomously. @huggingface @pollenrobotics would love to try it early and share my thoughts/experiments with the world!

So GPT-6: - one-shotted a counter-example to the Jacobian conjecture - and then escaped containment, and hacked into HuggingFace… all for a benchmark Yeah, this model is going to be something else.

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I'm so angry... the OpenAI team is looking into it, but this feels like something that should happen with GPT-3.5. Not a mid-2026 frontier model on the highest reasoning level.

I've had access to GPT-5.6 since May 27. Everyone is going to tell you it's incredible. They're right. But this isn't another post glazing 5.6. For 2 weeks, it was the best model I'd ever used. Then Fable came out, and I stopped using GPT-5.6 overnight. Here's my review: