Zerank 2 vs Zerank 1 Small
Detailed comparison between Zerank 2 and Zerank 1 Small. See which reranker best meets your accuracy and performance needs.
Model Comparison
Zerank 2 takes the lead.
Both Zerank 2 and Zerank 1 Small 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 102 higher ELO rating
Overview
Key metrics
ELO Rating
Overall ranking quality
Zerank 2
Zerank 1 Small
Win Rate
Head-to-head performance
Zerank 2
Zerank 1 Small
Accuracy (nDCG@10)
Ranking quality metric
Zerank 2
Zerank 1 Small
Average Latency
Response time
Zerank 2
Zerank 1 Small
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 2 | Zerank 1 Small | Description |
|---|---|---|---|
| Overall Performance | |||
| ELO Rating | 1658 | 1556 | Overall ranking quality based on pairwise comparisons |
| Win Rate | 63.0% | 58.6% | Percentage of comparisons won against other models |
| Pricing & Availability | |||
| Price per 1M tokens | $0.025 | $0.025 | Cost per million tokens processed |
| Release Date | 2025-11-18 | 2025-07-10 | Model release date |
| Accuracy Metrics | |||
| Avg nDCG@10 | 0.079 | 0.083 | Normalized discounted cumulative gain at position 10 |
| Performance Metrics | |||
| Avg Latency | 265ms | 248ms | 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 2 | Zerank 1 Small | Description |
|---|---|---|---|
| Latency Metrics | |||
| Mean | 233ms | 217ms | Average response time |
| P50 | 228ms | 214ms | 50th percentile (median) |
| P90 | 251ms | 227ms | 90th percentile |
arguana
| Metric | Zerank 2 | Zerank 1 Small | Description |
|---|---|---|---|
| Accuracy Metrics | |||
| nDCG@5 | 0.283 | 0.279 | Ranking quality at top 5 results |
| nDCG@10 | 0.355 | 0.375 | Ranking quality at top 10 results |
| Recall@5 | 0.540 | 0.520 | % of relevant docs in top 5 |
| Recall@10 | 0.760 | 0.820 | % of relevant docs in top 10 |
| Latency Metrics | |||
| Mean | 280ms | 256ms | Average response time |
| P50 | 278ms | 254ms | 50th percentile (median) |
| P90 | 312ms | 280ms | 90th percentile |
FiQa
| Metric | Zerank 2 | Zerank 1 Small | Description |
|---|---|---|---|
| Accuracy Metrics | |||
| nDCG@5 | 0.108 | 0.114 | Ranking quality at top 5 results |
| nDCG@10 | 0.119 | 0.124 | Ranking quality at top 10 results |
| Recall@5 | 0.098 | 0.098 | % of relevant docs in top 5 |
| Recall@10 | 0.130 | 0.125 | % of relevant docs in top 10 |
| Latency Metrics | |||
| Mean | 251ms | 248ms | Average response time |
| P50 | 254ms | 244ms | 50th percentile (median) |
| P90 | 270ms | 266ms | 90th percentile |
business reports
| Metric | Zerank 2 | Zerank 1 Small | Description |
|---|---|---|---|
| Latency Metrics | |||
| Mean | 288ms | 251ms | Average response time |
| P50 | 269ms | 242ms | 50th percentile (median) |
| P90 | 367ms | 298ms | 90th percentile |
PG
| Metric | Zerank 2 | Zerank 1 Small | Description |
|---|---|---|---|
| Latency Metrics | |||
| Mean | 293ms | 287ms | Average response time |
| P50 | 281ms | 274ms | 50th percentile (median) |
| P90 | 328ms | 345ms | 90th percentile |
DBPedia
| Metric | Zerank 2 | Zerank 1 Small | Description |
|---|---|---|---|
| Latency Metrics | |||
| Mean | 247ms | 226ms | Average response time |
| P50 | 242ms | 223ms | 50th percentile (median) |
| P90 | 274ms | 241ms | 90th percentile |
Explore More
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