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# AI agents solved 93% of Cybench security challenges unguided in early 2026, up from 17.5% in 2024
- URL: https://aiadoption.org/data/cybench-cybersecurity-agents/
- Published: 2026-10-19T16:06:02.000Z
- Updated: 2026-10-21T06:00:51.000Z
- Description: On Cybench, 40 professional capture-the-flag security tasks, the best unguided solve rate rose from 17.5% in 2024 (Claude 3.5 Sonnet) to 82% in 2025 and 93% in early 2026 (Claude Opus 4.6).
- Author: Manu
- Tags: Data, AI Benchmarks, AI Cybersecurity, #chart, #ai-index-2026, #hub-benchmarks, #topic-ai-agents

93%

▲ 75.5 pts since 2024

of Cybench tasks solved unguided by Claude Opus 4.6, early 2026

20242026

## What the chart shows

Cybench tests AI agents on 40 professional-level capture-the-flag tasks in areas such as cryptography, web security, reverse engineering, forensics and exploitation; the first human solvers took from two minutes to almost 25 hours. The best unguided solve rate rose from 17.5% (Claude 3.5 Sonnet) in 2024 to 82% (Claude 4.5 Opus) in 2025 and 93% (Claude Opus 4.6) in early 2026.

The AI Index calls this the steepest improvement among its agent benchmarks, and suggests capture-the-flag tasks suit current agents well.

## Key numbers

| Measure                 | Value                   |
| ----------------------- | ----------------------- |
| 2024: Claude 3.5 Sonnet | 17.5%                   |
| 2025: Claude 4.5 Opus   | 82%                     |
| 2026: Claude Opus 4.6   | 93%                     |
| Change, 2024 to 2026    | +75.5 percentage points |

## How to read it

- Unguided means the agent gets each task whole, without it being broken into subtasks.
- The report text says the rate rose from 15% in 2024; the data shows 17.5%, which we use.
- 2026 covers results to early 2026.

**Source:** [Cybench Leaderboard](https://aiadoption.org/sources/#cybench), 2026, via the AI Index Report 2026 (Stanford HAI), figure 2.6.5: *Cybench: unguided % solved*. Chart and text by AI Adoption.  
Numbers checked against the published data on 20 October 2026.  
[Download the data (CSV)](https://charts.aiadoption.org/ai-index/csv/cybench-cybersecurity-agents.csv?ref=aiadoption.org) · [Cite this chart](#source)