LiT (Lost in Translation) Robustness - Register and Tone Shifts: leaderboard
Metric: MQM>=80 rate (%): share of round-trip translations whose back-translation to English scores at least 80 on an MQM error scale (minor -1, major -5, critical -25) from a Grok 4.1 Fast judge comparing it with the English source; each passage is translated serially through a four-language sequence and back, averaged over eight sequences (high, medium and low-resource languages); robustness subset: register and tone shifts; higher is better. Source: arxiv.org. Saturation forecast: Around January 2027. 22 models tracked.
Top models
| # | Model | Score |
|---|---|---|
| 1 | Qwen 3.5 397B A17B | 58.3 |
| 2 | GLM-5 | 57.3 |
| 3 | Gemma 4 31B (IT) (Thinking) | 55.2 |
| 4 | Gemma 4 31B (IT) | 53.1 |
| 5 | Qwen 3.5 397B A17B (Non-reasoning) | 52.1 |
| 6 | Kimi K2 (Thinking) | 50 |
| 7 | Qwen 3.5 35B A3B | 43.8 |
| 8 | GLM-4.7 | 43.8 |
| 9 | GPT-OSS-120B (High) | 38.5 |
| 10 | Gemma 3 27B (IT) | 37.5 |
| 11 | Qwen 3 235B A22B 2507 (Thinking) | 37.5 |
| 12 | DeepSeek V3.2 Exp (Thinking) | 34.4 |
| 13 | Qwen 3 235B A22B 2507 Instruct | 32.3 |
| 14 | MiniMax-M2.5 | 32.3 |
| 15 | DeepSeek V3.2 Exp (Non-reasoning) | 32.3 |
Interactive version: theaggregate.ai/benchmark?slug=lit-lost-in-translation-robustness-register-and-tone-shifts · How It Works · Data refreshed daily, snapshot 2026-10-07.