LexKairos (Thinking Mode) - Peremptory Period Reasoning: leaderboard
The Peremptory Period Reasoning sub-task of LexKairos (Tsinghua University, 2026): decide whether a peremptory period has lapsed under the applicable statute. Accuracy in percent over 180 items in the thinking mode at high effort; higher is better.
Metric: Accuracy (%; 180 items: decide whether a peremptory period has lapsed under the applicable statute; thinking mode, built-in reasoning enabled at high effort with the vanilla prompt; temperature 0, 8,000 output tokens). Source: arxiv.org. Saturation forecast: Around February 2027. 5 models tracked.
Top models
| # | Model | Score | Overall rank |
|---|---|---|---|
| 1 | Gemini 3 Flash (High) | 74.44 | #164 (Gemini 3 Flash) |
| 2 | GPT-5.4 (High) | 69.44 | #123 (GPT-5.4) |
| 3 | DeepSeek V4 Flash (High) | 64.44 | #258 (DeepSeek V4 Flash) |
| 4 | Qwen 3.5 9B (Thinking) | 57.22 | #803 (Qwen 3.5 9B) |
No result here: #1 Claude Fable 5.2, #2 Gemini 4 Carbon, #5 Claude Opus 5.5.
Interactive version: theaggregate.ai/benchmark?slug=lexkairos-thinking-mode-peremptory-period-reasoning · How It Works · Data refreshed daily, snapshot 2026-11-13.