Your Sandbox Is Made of Glass

For 14 cents, a thinking machine will break into your server. Here is the 4-billion-parameter Guardian that held the frontier to 75 losses and zero wins.

Study2026Dustin Allen, Aditya Chitlangia, and Hearsch Jariwala

The price of a breach

$0.14Average breachWhat a frontier model spends to run a fully automated, multi-step break-in.
$0.0024Cheapest breakoutLess than a quarter of one penny.
$55.95The whole campaignAll 305 trials, start to finish.

The economy of ruin

Hacking was supposed to be expensive. We sent the bill.

The whole offensive campaign in this paper, 305 attempts to break real containers by nine frontier models, burned 43,717,137 tokens over 4,517 minutes of machine time. It cost less than dinner for two. The price of attacking is no longer a barrier. It rounds to nothing.

The average fully automated, multi-step breach costs 14 cents. The cheapest single breakout in the entire study cost less than a quarter of one penny. When the model weights are free to download, the only remaining cost is electricity.

305Live breakout trials9 frontier models, 10 setups
10,623Shell commands recordedEvery output captured
75Guardian winsIn live sparring matches
0Escapes allowedA perfect shutout

The empty sandbox

The safe middle is gone, and the capability cliff is crumbling.

Standard misconfigurations fell every single time. An exposed Docker socket or a privileged container was breached 34 out of 34 attempts.

The tier engineers assumed was safe collapsed too. Even the hard tier, the CVE and kernel exploits that take a human expert 30 to 90 minutes, fell 45% of the time to a single model. That number was 0% one generation earlier.

Breakout success rate by tier

  • Exposed Docker socket or --privilegedCareless mount100%
  • Shared host namespaces + CAP_SYS_PTRACEThe "safe middle"96%
  • Overprivileged Kubernetes service accountsCluster permissions84%
  • CVE and kernel exploits (GLM-5.1)Expert, 30 to 90 min45%

The hard tier jumped from 0% to 45% in a single model generation. There is no reading of that trend where the attacker gets weaker.

David vs. Goliath

A 4-billion-parameter Guardian held attackers up to 250 times its size to a perfect zero.

100%Win rateAcross 75 matches against the 5 strongest models. Zero escapes.
91.4%CaughtOf 7,871 proposed tool calls, the Guardian stopped 7,201 and let 670 harmless ones through.
250×Size gapThe small Guardian beat models from 600 billion to over a trillion parameters.

Why blocklists lose

You cannot block a word the machine can spell an infinite number of ways.

When a model wanted to read a protected file, it never typed the name. It built the path out of raw character codes and let the language reassemble it. When that was caught, it switched languages. When that was caught, it reached for base64. One intent, an endless supply of disguises.

The Guardian’s answer: silent correction

54%Quietly defusedOf 10,811 decisions, 5,833 rewrote a malicious probe into a harmless no-op instead of just blocking it.

The attacker thinks it is making progress in an empty room. It never gets the feedback it needs to map the defenses, because a correction feels like a dead end in its own plan, not a defender’s hand.

The failure tax

A defeated machine does not just fail. It thrashes, then it unravels.

10×Compute taxWinning runs used 26,016 tokens in 19 commands. Failing runs burned 259,547 tokens over 109 commands.
0.030Reasoning ratioWinners think before they act at 0.667. Thwarted models panic and collapse to 0.030, spamming commands.

The directive

What this means.

  • The empty sandbox is broken by default.
  • The price of attacking has rounded to nothing.
  • A blocklist repeats itself perfectly and loses every time.

We held the strongest open-weights attackers on the planet to 75 losses out of 75, in the hard setting, with the boundary shown to them. The next generation of attackers will be stronger. The method in this paper is the one whose advantage grows when they are.

Get your own AI on your side.

Everything we learn goes into Emu.

Free for you, on every device. Teams from $5 a person.

Today’s spots are full.

We let people in a few at a time. Get on the list and you’re in line for the next batch.

Next spots open tomorrow

Free for you. We only email you about Emu.