Zerank 2 vs Cohere Rerank 4 Fast
Detailed comparison between Zerank 2 and Cohere Rerank 4 Fast. See which reranker best meets your accuracy and performance needs.
Model Comparison
Zerank 2 takes the lead.
Both Zerank 2 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 Zerank 2:
- Zerank 2 has 137 higher ELO rating
- Zerank 2 delivers better accuracy (nDCG@10: 0.079 vs 0.000)
- Zerank 2 is 181ms faster on average
- Zerank 2 has a 9.0% higher win rate
Overview
Key metrics
ELO Rating
Overall ranking quality
Zerank 2
Cohere Rerank 4 Fast
Win Rate
Head-to-head performance
Zerank 2
Cohere Rerank 4 Fast
Accuracy (nDCG@10)
Ranking quality metric
Zerank 2
Cohere Rerank 4 Fast
Average Latency
Response time
Zerank 2
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 | Zerank 2 | Cohere Rerank 4 Fast | Description |
|---|---|---|---|
| Overall Performance | |||
| ELO Rating | 1644 | 1506 | Overall ranking quality based on pairwise comparisons |
| Win Rate | 58.3% | 49.3% | Percentage of comparisons won against other models |
| Pricing & Availability | |||
| Price per 1M tokens | $0.025 | $0.050 | Cost per million tokens processed |
| Release Date | 2025-11-18 | 2025-12-11 | Model release date |
| Accuracy Metrics | |||
| Avg nDCG@10 | 0.079 | N/A | Normalized discounted cumulative gain at position 10 |
| Performance Metrics | |||
| Avg Latency | 265ms | 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 | Zerank 2 | Cohere Rerank 4 Fast | Description |
|---|---|---|---|
| Latency Metrics | |||
| Mean | 233ms | 403ms | Average response time |
| P50 | 228ms | 382ms | 50th percentile (median) |
| P90 | 251ms | 486ms | 90th percentile |
arguana
| Metric | Zerank 2 | Cohere Rerank 4 Fast | Description |
|---|---|---|---|
| Latency Metrics | |||
| Mean | 280ms | 574ms | Average response time |
| P50 | 278ms | 562ms | 50th percentile (median) |
| P90 | 312ms | 728ms | 90th percentile |
FiQa
| Metric | Zerank 2 | Cohere Rerank 4 Fast | Description |
|---|---|---|---|
| Latency Metrics | |||
| Mean | 251ms | 485ms | Average response time |
| P50 | 254ms | 459ms | 50th percentile (median) |
| P90 | 270ms | 624ms | 90th percentile |
business reports
| Metric | Zerank 2 | Cohere Rerank 4 Fast | Description |
|---|---|---|---|
| Latency Metrics | |||
| Mean | 288ms | 428ms | Average response time |
| P50 | 269ms | 408ms | 50th percentile (median) |
| P90 | 367ms | 550ms | 90th percentile |
PG
| Metric | Zerank 2 | Cohere Rerank 4 Fast | Description |
|---|---|---|---|
| Latency Metrics | |||
| Mean | 293ms | 492ms | Average response time |
| P50 | 281ms | 439ms | 50th percentile (median) |
| P90 | 328ms | 650ms | 90th percentile |
DBPedia
| Metric | Zerank 2 | Cohere Rerank 4 Fast | Description |
|---|---|---|---|
| Latency Metrics | |||
| Mean | 247ms | 297ms | Average response time |
| P50 | 242ms | 297ms | 50th percentile (median) |
| P90 | 274ms | 309ms | 90th percentile |
Explore More
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