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