MemoryCD (Books) - Rating Error: leaderboard
Metric: Mean absolute error of the predicted 1-5 star rating for a target item, on MemoryCD's Books domain (89 users with long histories, their 3 most recent interactions each), the whole history concatenated into the prompt; lower is better. Source: arxiv.org. Saturation forecast: Estimated already saturated. 7 models tracked.
Top models
| # | Model | Score | Overall rank |
|---|---|---|---|
| 1 | GPT-5 | 0.33 | #91 |
| 2 | Gemini 2.5 Pro | 0.4 | #145 |
| 3 | Gemini 2.5 Flash | 0.41 | #237 |
| 4 | GPT-5 Mini | 0.46 | #176 |
| 5 | GPT-5 Nano | 0.54 | #415 |
| 6 | Claude Opus 4 | 0.61 | #155 |
| 7 | Claude Sonnet 4 | 0.67 | #194 |
No result here: #3 Claude Opus 5.5, #5 GPT-6 Astra, #8 Claude Fable 5.1.
Interactive version: theaggregate.ai/benchmark?slug=memorycd-books-rating-error · How It Works · Data refreshed daily, snapshot 2026-10-11.