Zerank 1 vs Voyage AI Rerank 2.5
Detailed comparison between Zerank 1 and Voyage AI Rerank 2.5. See which reranker best meets your accuracy and performance needs.
Model Comparison
Zerank 1 takes the lead.
Both Zerank 1 and Voyage AI Rerank 2.5 are powerful reranking models designed to improve retrieval quality in RAG applications. However, their performance characteristics differ in important ways.
Why Zerank 1:
- Zerank 1 has 27 higher ELO rating
- Zerank 1 is 347ms faster on average
Overview
Key metrics
ELO Rating
Overall ranking quality
Zerank 1
Voyage AI Rerank 2.5
Win Rate
Head-to-head performance
Zerank 1
Voyage AI Rerank 2.5
Accuracy (nDCG@10)
Ranking quality metric
Zerank 1
Voyage AI Rerank 2.5
Average Latency
Response time
Zerank 1
Voyage AI Rerank 2.5
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 | Voyage AI Rerank 2.5 | Description |
|---|---|---|---|
| Overall Performance | |||
| ELO Rating | 1574 | 1547 | Overall ranking quality based on pairwise comparisons |
| Win Rate | 57.3% | 58.7% | Percentage of comparisons won against other models |
| Pricing & Availability | |||
| Price per 1M tokens | $0.025 | $0.050 | Cost per million tokens processed |
| Release Date | 2025-07-10 | 2025-08-11 | Model release date |
| Accuracy Metrics | |||
| Avg nDCG@10 | 0.192 | 0.235 | Normalized discounted cumulative gain at position 10 |
| Performance Metrics | |||
| Avg Latency | 266ms | 613ms | 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 | Voyage AI Rerank 2.5 | Description |
|---|---|---|---|
| Accuracy Metrics | |||
| nDCG@5 | 0.439 | 0.571 | Ranking quality at top 5 results |
| nDCG@10 | 0.499 | 0.584 | Ranking quality at top 10 results |
| Recall@5 | 0.600 | 0.760 | % of relevant docs in top 5 |
| Recall@10 | 0.780 | 0.800 | % of relevant docs in top 10 |
| Latency Metrics | |||
| Mean | 232ms | 571ms | Average response time |
| P50 | 226ms | 611ms | 50th percentile (median) |
| P90 | 245ms | 647ms | 90th percentile |
arguana
| Metric | Zerank 1 | Voyage AI Rerank 2.5 | Description |
|---|---|---|---|
| Accuracy Metrics | |||
| nDCG@5 | 0.308 | 0.536 | Ranking quality at top 5 results |
| nDCG@10 | 0.369 | 0.543 | Ranking quality at top 10 results |
| Recall@5 | 0.580 | 0.960 | % of relevant docs in top 5 |
| Recall@10 | 0.760 | 0.980 | % of relevant docs in top 10 |
| Latency Metrics | |||
| Mean | 287ms | 675ms | Average response time |
| P50 | 275ms | 612ms | 50th percentile (median) |
| P90 | 332ms | 820ms | 90th percentile |
FiQa
| Metric | Zerank 1 | Voyage AI Rerank 2.5 | Description |
|---|---|---|---|
| Accuracy Metrics | |||
| nDCG@5 | 0.115 | 0.108 | Ranking quality at top 5 results |
| nDCG@10 | 0.121 | 0.119 | Ranking quality at top 10 results |
| Recall@5 | 0.105 | 0.098 | % of relevant docs in top 5 |
| Recall@10 | 0.125 | 0.128 | % of relevant docs in top 10 |
| Latency Metrics | |||
| Mean | 259ms | 627ms | Average response time |
| P50 | 258ms | 611ms | 50th percentile (median) |
| P90 | 276ms | 814ms | 90th percentile |
business reports
| Metric | Zerank 1 | Voyage AI Rerank 2.5 | Description |
|---|---|---|---|
| Latency Metrics | |||
| Mean | 289ms | 612ms | Average response time |
| P50 | 272ms | 521ms | 50th percentile (median) |
| P90 | 363ms | 734ms | 90th percentile |
PG
| Metric | Zerank 1 | Voyage AI Rerank 2.5 | Description |
|---|---|---|---|
| Latency Metrics | |||
| Mean | 293ms | 612ms | Average response time |
| P50 | 279ms | 612ms | 50th percentile (median) |
| P90 | 348ms | 791ms | 90th percentile |
DBPedia
| Metric | Zerank 1 | Voyage AI Rerank 2.5 | Description |
|---|---|---|---|
| Accuracy Metrics | |||
| nDCG@5 | 0.145 | 0.163 | Ranking quality at top 5 results |
| nDCG@10 | 0.161 | 0.164 | 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 | 238ms | 583ms | Average response time |
| P50 | 233ms | 613ms | 50th percentile (median) |
| P90 | 257ms | 632ms | 90th percentile |
Explore More
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