CyberGym
CyberGym is a benchmark for evaluating AI agents on cybersecurity tasks, testing their ability to identify vulnerabilities, perform security analysis, and complete security-related challenges in a controlled environment.
Claude Mythos Preview from Anthropic currently leads the CyberGym leaderboard with a score of 0.831 across 6 evaluated AI models.
Claude Mythos Preview leads with 83.1%, followed by 
GPT-5.5 at 81.8% and Claude Opus 4.6 at 73.8%.
Progress Over Time
Interactive timeline showing model performance evolution on CyberGym
CyberGym Leaderboard
| Context | Cost | License | ||||
|---|---|---|---|---|---|---|
| 1 | Anthropic | — | — | — | ||
| 2 | OpenAI | — | 1.1M | $5.00 / $30.00 | ||
| 3 | Anthropic | — | 1.0M | $5.00 / $25.00 | ||
| 4 | Anthropic | — | 1.0M | $5.00 / $25.00 | ||
| 5 |  Zhipu AI | 754B | 200K | $1.40 / $4.40 | ||
| 6 |  Moonshot AI | 1.0T | 262K | $0.60 / $3.00 |
FAQ
Common questions about CyberGym.
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