Google says that in simulated cyberattack testing seeded with ExploitBench and CyScenarioBench, "Carbon blocked 99% of attack trajectories from our adaptive red-teaming agent", and that its safeguards "lowered the per-attempt breach rate to just 0.8% (down from 3.1% on Argon)". This is Google's own testing.

The exact words it rests on

In simulated cyberattack testing environments seeded with ExploitBench and CyScenarioBench, Carbon blocked 99% of attack trajectories from our adaptive red-teaming agent that can iteratively revisit its attack plans after each block. The Carbon safeguards lowered the per-attempt breach rate to just 0.8% (down from 3.1% on Argon).

What the source said when we opened it, on 12 Nov 2026.

The source

Gemini 4 Carbon is now available (10 Nov 2026)
Google DeepMind · 2026-11-10

Open the sourcearchived copy

Checked

Checked by the notis newsroom on 12 Nov 2026, against the source above.

In the story

Gemini 4 Carbon, which Google built for hard tasks, opens to paying developers 12 Nov 2026