HoWToBench - Letters: leaderboard
Metric: Tree-of-Writing score: GPT-4o rates each content trait 1-10 against the human reference and format traits 0, 5 or 10, combined with per-instruction LLM-assigned weights that sum to 1, mean over the letters writing instructions of HoWToBench; higher is better. Source: arxiv.org. Saturation forecast: Estimated already saturated. 10 models tracked.
Top models
| # | Model | Score |
|---|---|---|
| 1 | GPT-4o (2024-11-20) | 6.13 |
| 2 | Gemini 2.0 Flash | 6.12 |
| 3 | O3 Mini (2025-01-31) | 6.11 |
| 4 | Claude 3.5 Sonnet (20241022) | 6.08 |
| 5 | Llama 3.3 70B Instruct | 5.64 |
| 6 | Claude 3 Haiku (20240307) | 5.47 |
Interactive version: theaggregate.ai/benchmark?slug=howtobench-letters · How It Works · Data refreshed daily, snapshot 2026-10-07.