ExplorationBench - AlienCode: leaderboard
Metric: Held-out accuracy after exploration (%; Best@3: the highest round-4 score among three independent autonomous exploration trajectories of 12 tool calls per round; AlienCode, a calculation language with 31 hidden altered semantics, 70 program-synthesis and prediction tasks graded by an interpreter on private inputs; 70 held-out tasks each answered three times in a tool-disabled copy of the conversation and averaged; highest reasoning setting each API offers). Source: arxiv.org. Saturation forecast: Around December 2026. 10 models tracked.
Top models
| # | Model | Score |
|---|---|---|
| 1 | Claude Opus 5 (Max) | 87.6 |
| 2 | GPT-5.6 Sol (Max) | 87.1 |
| 3 | Kimi K3 (Max) | 77.6 |
| 4 | Gemini 3.8 Flash (High) | 77.6 |
| 5 | Grok 4.6 (xHigh) | 67.6 |
| 6 | DeepSeek V4.1 Flash (Max) | 58.1 |
| 7 | DeepSeek V4 Pro (Max) | 12.9 |
Interactive version: theaggregate.ai/benchmark?slug=explorationbench-aliencode · How It Works · Data refreshed daily, snapshot 2026-09-26.