Voyage AI Rerank 2.5 vs Cohere Rerank 4 Fast
Detailed comparison between Voyage AI Rerank 2.5 and Cohere Rerank 4 Fast. 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 Cohere Rerank 4 Fast 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 41 higher ELO rating
- Voyage AI Rerank 2.5 delivers better accuracy (nDCG@10: 0.110 vs 0.000)
- Voyage AI Rerank 2.5 has a 9.4% higher win rate
Overview
Key metrics
ELO Rating
Overall ranking quality
Voyage AI Rerank 2.5
Cohere Rerank 4 Fast
Win Rate
Head-to-head performance
Voyage AI Rerank 2.5
Cohere Rerank 4 Fast
Accuracy (nDCG@10)
Ranking quality metric
Voyage AI Rerank 2.5
Cohere Rerank 4 Fast
Average Latency
Response time
Voyage AI Rerank 2.5
Cohere Rerank 4 Fast
Visual Performance Analysis
Performance
ELO Rating Comparison
Win/Loss/Tie Breakdown
Latency Distribution (ms)
Breakdown
How the models stack up
| Metric | Voyage AI Rerank 2.5 | Cohere Rerank 4 Fast | Description |
|---|---|---|---|
| Overall Performance | |||
| ELO Rating | 1547 | 1506 | Overall ranking quality based on pairwise comparisons |
| Win Rate | 58.7% | 49.3% | 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 | 2025-12-11 | Model release date |
| Accuracy Metrics | |||
| Avg nDCG@10 | 0.110 | N/A | Normalized discounted cumulative gain at position 10 |
| Performance Metrics | |||
| Avg Latency | 613ms | 447ms | 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 | Cohere Rerank 4 Fast | Description |
|---|---|---|---|
| Latency Metrics | |||
| Mean | 571ms | 403ms | Average response time |
| P50 | 611ms | 382ms | 50th percentile (median) |
| P90 | 647ms | 486ms | 90th percentile |
arguana
| Metric | Voyage AI Rerank 2.5 | Cohere Rerank 4 Fast | Description |
|---|---|---|---|
| Latency Metrics | |||
| Mean | 675ms | 574ms | Average response time |
| P50 | 612ms | 562ms | 50th percentile (median) |
| P90 | 820ms | 728ms | 90th percentile |
FiQa
| Metric | Voyage AI Rerank 2.5 | Cohere Rerank 4 Fast | Description |
|---|---|---|---|
| Latency Metrics | |||
| Mean | 627ms | 485ms | Average response time |
| P50 | 611ms | 459ms | 50th percentile (median) |
| P90 | 814ms | 624ms | 90th percentile |
business reports
| Metric | Voyage AI Rerank 2.5 | Cohere Rerank 4 Fast | Description |
|---|---|---|---|
| Latency Metrics | |||
| Mean | 612ms | 428ms | Average response time |
| P50 | 521ms | 408ms | 50th percentile (median) |
| P90 | 734ms | 550ms | 90th percentile |
PG
| Metric | Voyage AI Rerank 2.5 | Cohere Rerank 4 Fast | Description |
|---|---|---|---|
| Latency Metrics | |||
| Mean | 612ms | 492ms | Average response time |
| P50 | 612ms | 439ms | 50th percentile (median) |
| P90 | 791ms | 650ms | 90th percentile |
DBPedia
| Metric | Voyage AI Rerank 2.5 | Cohere Rerank 4 Fast | Description |
|---|---|---|---|
| Latency Metrics | |||
| Mean | 583ms | 297ms | Average response time |
| P50 | 613ms | 297ms | 50th percentile (median) |
| P90 | 632ms | 309ms | 90th percentile |
Explore More
Compare more rerankers
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