StepJack (2-Step): leaderboard
Metric: Attack success rate (%, lower is better; share of examples whose environment-state checker finds the adversarial goal achieved; the goal decomposed into 2 innocuous sub-steps on a chain of linked pages; each computer-use agent in its default OSWorld agent implementation with 15 x k actions, on StepJack tasks in Reddit and OwnCloud environments with 12 adversarial goals; no urgency cue; one run). Source: arxiv.org. Saturation forecast: Around November 2027. 6 models tracked.
Top models
| # | Model | Score |
|---|---|---|
| 1 | Claude Haiku 4.5 | 14.6 |
| 2 | Claude Sonnet 4.6 | 17.7 |
| 3 | Qwen 3.5 Plus | 22.9 |
| 4 | GPT-5.4 Mini (xHigh) | 60.4 |
| 5 | Kimi K2.5 | 64.6 |
Interactive version: theaggregate.ai/benchmark?slug=stepjack-2-step · How It Works · Data refreshed daily, snapshot 2026-09-29.