Zerank 1 Small vs Zerank 2
Detailed comparison between Zerank 1 Small and Zerank 2. See which reranker best meets your accuracy and performance needs.
Model Comparison
Zerank 2 takes the lead.
Both Zerank 1 Small and Zerank 2 are powerful reranking models designed to improve retrieval quality in RAG applications. However, their performance characteristics differ in important ways.
Why Zerank 2:
- Zerank 2 has 103 higher ELO rating
Overview
Key metrics
ELO Rating
Overall ranking quality
Zerank 1 Small
Zerank 2
Win Rate
Head-to-head performance
Zerank 1 Small
Zerank 2
Accuracy (nDCG@10)
Ranking quality metric
Zerank 1 Small
Zerank 2
Average Latency
Response time
Zerank 1 Small
Zerank 2
Visual Performance Analysis
Performance
ELO Rating Comparison
Win/Loss/Tie Breakdown
Accuracy Across Datasets (nDCG@10)
Latency Distribution (ms)
Breakdown
How the models stack up
| Metric | Zerank 1 Small | Zerank 2 | Description |
|---|---|---|---|
| Overall Performance | |||
| ELO Rating | 1541 | 1644 | Overall ranking quality based on pairwise comparisons |
| Win Rate | 55.6% | 58.3% | Percentage of comparisons won against other models |
| Pricing & Availability | |||
| Price per 1M tokens | $0.025 | $0.025 | Cost per million tokens processed |
| Release Date | 2025-07-10 | 2025-11-18 | Model release date |
| Accuracy Metrics | |||
| Avg nDCG@10 | 0.202 | 0.195 | Normalized discounted cumulative gain at position 10 |
| Performance Metrics | |||
| Avg Latency | 248ms | 265ms | Average response time across all datasets |
Dataset Performance
By field
Comprehensive comparison of accuracy metrics (nDCG, Recall) and latency percentiles for each benchmark dataset.
MSMARCO
| Metric | Zerank 1 Small | Zerank 2 | Description |
|---|---|---|---|
| Accuracy Metrics | |||
| nDCG@5 | 0.498 | 0.491 | Ranking quality at top 5 results |
| nDCG@10 | 0.552 | 0.546 | Ranking quality at top 10 results |
| Recall@5 | 0.640 | 0.620 | % of relevant docs in top 5 |
| Recall@10 | 0.800 | 0.780 | % of relevant docs in top 10 |
| Latency Metrics | |||
| Mean | 217ms | 233ms | Average response time |
| P50 | 214ms | 228ms | 50th percentile (median) |
| P90 | 227ms | 251ms | 90th percentile |
arguana
| Metric | Zerank 1 Small | Zerank 2 | Description |
|---|---|---|---|
| Accuracy Metrics | |||
| nDCG@5 | 0.279 | 0.283 | Ranking quality at top 5 results |
| nDCG@10 | 0.375 | 0.355 | Ranking quality at top 10 results |
| Recall@5 | 0.520 | 0.540 | % of relevant docs in top 5 |
| Recall@10 | 0.820 | 0.760 | % of relevant docs in top 10 |
| Latency Metrics | |||
| Mean | 256ms | 280ms | Average response time |
| P50 | 254ms | 278ms | 50th percentile (median) |
| P90 | 280ms | 312ms | 90th percentile |
FiQa
| Metric | Zerank 1 Small | Zerank 2 | Description |
|---|---|---|---|
| Accuracy Metrics | |||
| nDCG@5 | 0.114 | 0.108 | Ranking quality at top 5 results |
| nDCG@10 | 0.124 | 0.119 | Ranking quality at top 10 results |
| Recall@5 | 0.098 | 0.098 | % of relevant docs in top 5 |
| Recall@10 | 0.125 | 0.130 | % of relevant docs in top 10 |
| Latency Metrics | |||
| Mean | 248ms | 251ms | Average response time |
| P50 | 244ms | 254ms | 50th percentile (median) |
| P90 | 266ms | 270ms | 90th percentile |
business reports
| Metric | Zerank 1 Small | Zerank 2 | Description |
|---|---|---|---|
| Latency Metrics | |||
| Mean | 251ms | 288ms | Average response time |
| P50 | 242ms | 269ms | 50th percentile (median) |
| P90 | 298ms | 367ms | 90th percentile |
PG
| Metric | Zerank 1 Small | Zerank 2 | Description |
|---|---|---|---|
| Latency Metrics | |||
| Mean | 287ms | 293ms | Average response time |
| P50 | 274ms | 281ms | 50th percentile (median) |
| P90 | 345ms | 328ms | 90th percentile |
DBPedia
| Metric | Zerank 1 Small | Zerank 2 | Description |
|---|---|---|---|
| Accuracy Metrics | |||
| nDCG@5 | 0.160 | 0.138 | Ranking quality at top 5 results |
| nDCG@10 | 0.160 | 0.151 | Ranking quality at top 10 results |
| Recall@5 | 0.004 | 0.004 | % of relevant docs in top 5 |
| Recall@10 | 0.005 | 0.005 | % of relevant docs in top 10 |
| Latency Metrics | |||
| Mean | 226ms | 247ms | Average response time |
| P50 | 223ms | 242ms | 50th percentile (median) |
| P90 | 241ms | 274ms | 90th percentile |
Explore More
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