MosaicLeaks: leaderboard
Metric: Strict chain success (%; share of 344 test multi-hop research tasks with every hop answered correctly, mean of three runs; default prompt). Source: arxiv.org. Saturation forecast: Around August 2027. 6 models tracked.
Top models
| # | Model | Score |
|---|---|---|
| 1 | Gemma 4 31B (IT) | 63.6 |
| 2 | GPT-OSS-20B | 52.4 |
| 3 | Step 3.5 Flash | 51.4 |
| 4 | Qwen 3 4B Instruct | 48.7 |
| 5 | Qwen 3 8B | 48.4 |
Interactive version: theaggregate.ai/benchmark?slug=mosaicleaks · How It Works · Data refreshed daily, snapshot 2026-09-26.