Sand-Glass (Prompted Compression) - Chinese-Spanish Translation Density: leaderboard
Metric: BLEU-rho (back-translation BLEU divided by the target/source syllable ratio; Zh-Es, target band 1.0-1.1; 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 July 2027. 4 models tracked.
Top models
| # | Model | Score |
|---|---|---|
| 1 | GPT-5 (Low) | 0.27 |
| 2 | Claude Opus 4.1 | 0.26 |
Interactive version: theaggregate.ai/benchmark?slug=sand-glass-prompted-compression-chinese-spanish-translation-density · How It Works · Data refreshed daily, snapshot 2026-09-25.