Voyage AI Rerank 2.5 vs Contextual AI Rerank v2 Instruct
Detailed comparison between Voyage AI Rerank 2.5 and Contextual AI Rerank v2 Instruct. See which reranker best meets your accuracy and performance needs.
Model Comparison
Voyage AI Rerank 2.5 takes the lead.
Both Voyage AI Rerank 2.5 and Contextual AI Rerank v2 Instruct are powerful reranking models designed to improve retrieval quality in RAG applications. However, their performance characteristics differ in important ways.
Why Voyage AI Rerank 2.5:
- Voyage AI Rerank 2.5 has 79 higher ELO rating
- Voyage AI Rerank 2.5 is 2400ms faster on average
- Voyage AI Rerank 2.5 has a 17.3% higher win rate
Overview
Key metrics
ELO Rating
Overall ranking quality
Voyage AI Rerank 2.5
Contextual AI Rerank v2 Instruct
Win Rate
Head-to-head performance
Voyage AI Rerank 2.5
Contextual AI Rerank v2 Instruct
Accuracy (nDCG@10)
Ranking quality metric
Voyage AI Rerank 2.5
Contextual AI Rerank v2 Instruct
Average Latency
Response time
Voyage AI Rerank 2.5
Contextual AI Rerank v2 Instruct
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 | Contextual AI Rerank v2 Instruct | Description |
|---|---|---|---|
| Overall Performance | |||
| ELO Rating | 1629 | 1550 | Overall ranking quality based on pairwise comparisons |
| Win Rate | 62.6% | 45.2% | Percentage of comparisons won against other models |
| Pricing & Availability | |||
| Price per 1M tokens | $0.050 | $0.050 | Cost per million tokens processed |
| Release Date | 2025-08-11 | 2025-09-12 | Model release date |
| Accuracy Metrics | |||
| Avg nDCG@10 | 0.680 | 0.687 | Normalized discounted cumulative gain at position 10 |
| Performance Metrics | |||
| Avg Latency | 610ms | 3010ms | Average response time across all datasets |
Dataset Performance
By field
Comprehensive comparison of accuracy metrics (nDCG, Recall) and latency percentiles for each benchmark dataset.
FiQa
| Metric | Voyage AI Rerank 2.5 | Contextual AI Rerank v2 Instruct | Description |
|---|---|---|---|
| Accuracy Metrics | |||
| nDCG@5 | 0.108 | 0.119 | Ranking quality at top 5 results |
| nDCG@10 | 0.119 | 0.125 | Ranking quality at top 10 results |
| Recall@5 | 0.098 | 0.123 | % of relevant docs in top 5 |
| Recall@10 | 0.128 | 0.135 | % of relevant docs in top 10 |
| Latency Metrics | |||
| Mean | 540ms | 2913ms | Average response time |
| P50 | 564ms | 2863ms | 50th percentile (median) |
| P90 | 626ms | 3289ms | 90th percentile |
SciFact
| Metric | Voyage AI Rerank 2.5 | Contextual AI Rerank v2 Instruct | Description |
|---|---|---|---|
| Accuracy Metrics | |||
| nDCG@5 | 0.865 | 0.867 | Ranking quality at top 5 results |
| nDCG@10 | 0.882 | 0.875 | Ranking quality at top 10 results |
| Recall@5 | 0.892 | 0.916 | % of relevant docs in top 5 |
| Recall@10 | 0.940 | 0.940 | % of relevant docs in top 10 |
| Latency Metrics | |||
| Mean | 667ms | 3317ms | Average response time |
| P50 | 621ms | 3198ms | 50th percentile (median) |
| P90 | 819ms | 4004ms | 90th percentile |
PG
| Metric | Voyage AI Rerank 2.5 | Contextual AI Rerank v2 Instruct | Description |
|---|---|---|---|
| Accuracy Metrics | |||
| Latency Metrics | |||
| Mean | 588ms | 3195ms | Average response time |
| P50 | 611ms | 2951ms | 50th percentile (median) |
| P90 | 746ms | 3781ms | 90th percentile |
business reports
| Metric | Voyage AI Rerank 2.5 | Contextual AI Rerank v2 Instruct | Description |
|---|---|---|---|
| Accuracy Metrics | |||
| Latency Metrics | |||
| Mean | 714ms | 2883ms | Average response time |
| P50 | 617ms | 2686ms | 50th percentile (median) |
| P90 | 834ms | 3161ms | 90th percentile |
MSMARCO
| Metric | Voyage AI Rerank 2.5 | Contextual AI Rerank v2 Instruct | Description |
|---|---|---|---|
| Accuracy Metrics | |||
| nDCG@5 | 0.971 | 0.975 | Ranking quality at top 5 results |
| nDCG@10 | 0.974 | 0.975 | Ranking quality at top 10 results |
| Recall@5 | 0.993 | 1.000 | % of relevant docs in top 5 |
| Recall@10 | 1.000 | 1.000 | % of relevant docs in top 10 |
| Latency Metrics | |||
| Mean | 583ms | 2952ms | Average response time |
| P50 | 611ms | 2853ms | 50th percentile (median) |
| P90 | 630ms | 3398ms | 90th percentile |
DBPedia
| Metric | Voyage AI Rerank 2.5 | Contextual AI Rerank v2 Instruct | Description |
|---|---|---|---|
| Accuracy Metrics | |||
| nDCG@5 | 0.657 | 0.734 | Ranking quality at top 5 results |
| nDCG@10 | 0.744 | 0.772 | Ranking quality at top 10 results |
| Recall@5 | 0.062 | 0.067 | % of relevant docs in top 5 |
| Recall@10 | 0.110 | 0.108 | % of relevant docs in top 10 |
| Latency Metrics | |||
| Mean | 571ms | 2803ms | Average response time |
| P50 | 610ms | 2786ms | 50th percentile (median) |
| P90 | 734ms | 3138ms | 90th percentile |
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