Sand-Glass (Prompted Compression) - Chinese-Spanish In-Bounds Rate: leaderboard
Metric: In-bounds rate (% of translations whose target/source syllable ratio falls in the 1.0-1.1 band; Zh-Es; 1,000 Mandarin video-transcript segments, prompt gives the source syllable count and target ratio band, mean of 3 runs). Source: arxiv.org. Saturation forecast: Around March 2027. 4 models tracked.
Top models
| # | Model | Score |
|---|---|---|
| 1 | GPT-5 (Low) | 62.6 |
| 2 | Claude Opus 4.1 | 26.6 |
Interactive version: theaggregate.ai/benchmark?slug=sand-glass-prompted-compression-chinese-spanish-in-bounds-rate · How It Works · Data refreshed daily, snapshot 2026-09-25.