Voyage AI Rerank 2.5 Lite vs Zerank 2
Detailed comparison between Voyage AI Rerank 2.5 Lite and Zerank 2. See which reranker best meets your accuracy and performance needs.
Model Comparison
Zerank 2 takes the lead.
Both Voyage AI Rerank 2.5 Lite 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 116 higher ELO rating
- Zerank 2 is 350ms faster on average
- Zerank 2 has a 5.2% higher win rate
Overview
Key metrics
ELO Rating
Overall ranking quality
Voyage AI Rerank 2.5 Lite
Zerank 2
Win Rate
Head-to-head performance
Voyage AI Rerank 2.5 Lite
Zerank 2
Accuracy (nDCG@10)
Ranking quality metric
Voyage AI Rerank 2.5 Lite
Zerank 2
Average Latency
Response time
Voyage AI Rerank 2.5 Lite
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 | Voyage AI Rerank 2.5 Lite | Zerank 2 | Description |
|---|---|---|---|
| Overall Performance | |||
| ELO Rating | 1528 | 1644 | Overall ranking quality based on pairwise comparisons |
| Win Rate | 53.1% | 58.3% | Percentage of comparisons won against other models |
| Pricing & Availability | |||
| Price per 1M tokens | $0.020 | $0.025 | Cost per million tokens processed |
| Release Date | 2025-08-11 | 2025-11-18 | Model release date |
| Accuracy Metrics | |||
| Avg nDCG@10 | 0.226 | 0.195 | Normalized discounted cumulative gain at position 10 |
| Performance Metrics | |||
| Avg Latency | 616ms | 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 | Voyage AI Rerank 2.5 Lite | Zerank 2 | Description |
|---|---|---|---|
| Accuracy Metrics | |||
| nDCG@5 | 0.577 | 0.491 | Ranking quality at top 5 results |
| nDCG@10 | 0.585 | 0.546 | Ranking quality at top 10 results |
| Recall@5 | 0.780 | 0.620 | % of relevant docs in top 5 |
| Recall@10 | 0.800 | 0.780 | % of relevant docs in top 10 |
| Latency Metrics | |||
| Mean | 563ms | 233ms | Average response time |
| P50 | 610ms | 228ms | 50th percentile (median) |
| P90 | 619ms | 251ms | 90th percentile |
arguana
| Metric | Voyage AI Rerank 2.5 Lite | Zerank 2 | Description |
|---|---|---|---|
| Accuracy Metrics | |||
| nDCG@5 | 0.436 | 0.283 | Ranking quality at top 5 results |
| nDCG@10 | 0.496 | 0.355 | Ranking quality at top 10 results |
| Recall@5 | 0.800 | 0.540 | % of relevant docs in top 5 |
| Recall@10 | 0.980 | 0.760 | % of relevant docs in top 10 |
| Latency Metrics | |||
| Mean | 636ms | 280ms | Average response time |
| P50 | 613ms | 278ms | 50th percentile (median) |
| P90 | 819ms | 312ms | 90th percentile |
FiQa
| Metric | Voyage AI Rerank 2.5 Lite | Zerank 2 | Description |
|---|---|---|---|
| Accuracy Metrics | |||
| nDCG@5 | 0.111 | 0.108 | Ranking quality at top 5 results |
| nDCG@10 | 0.122 | 0.119 | Ranking quality at top 10 results |
| Recall@5 | 0.103 | 0.098 | % of relevant docs in top 5 |
| Recall@10 | 0.135 | 0.130 | % of relevant docs in top 10 |
| Latency Metrics | |||
| Mean | 639ms | 251ms | Average response time |
| P50 | 613ms | 254ms | 50th percentile (median) |
| P90 | 819ms | 270ms | 90th percentile |
business reports
| Metric | Voyage AI Rerank 2.5 Lite | Zerank 2 | Description |
|---|---|---|---|
| Latency Metrics | |||
| Mean | 599ms | 288ms | Average response time |
| P50 | 611ms | 269ms | 50th percentile (median) |
| P90 | 727ms | 367ms | 90th percentile |
PG
| Metric | Voyage AI Rerank 2.5 Lite | Zerank 2 | Description |
|---|---|---|---|
| Latency Metrics | |||
| Mean | 670ms | 293ms | Average response time |
| P50 | 615ms | 281ms | 50th percentile (median) |
| P90 | 818ms | 328ms | 90th percentile |
DBPedia
| Metric | Voyage AI Rerank 2.5 Lite | Zerank 2 | Description |
|---|---|---|---|
| Accuracy Metrics | |||
| nDCG@5 | 0.146 | 0.138 | Ranking quality at top 5 results |
| nDCG@10 | 0.156 | 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 | 587ms | 247ms | Average response time |
| P50 | 612ms | 242ms | 50th percentile (median) |
| P90 | 656ms | 274ms | 90th percentile |
Explore More
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