Cohere Rerank 4 Pro vs Zerank 1
Detailed comparison between Cohere Rerank 4 Pro and Zerank 1. See which reranker best meets your accuracy and performance needs.
Model Comparison
Two competitive rerankers, closely matched.
Both Cohere Rerank 4 Pro and Zerank 1 are powerful reranking models designed to improve retrieval quality in RAG applications. They show comparable performance across key metrics.
Key similarities:
- Cohere Rerank 4 Pro has 53 higher ELO rating
- Zerank 1 delivers better accuracy (nDCG@10: 0.082 vs 0.000)
- Zerank 1 is 347ms faster on average
Overview
Key metrics
ELO Rating
Overall ranking quality
Cohere Rerank 4 Pro
Zerank 1
Win Rate
Head-to-head performance
Cohere Rerank 4 Pro
Zerank 1
Accuracy (nDCG@10)
Ranking quality metric
Cohere Rerank 4 Pro
Zerank 1
Average Latency
Response time
Cohere Rerank 4 Pro
Zerank 1
Visual Performance Analysis
Performance
ELO Rating Comparison
Win/Loss/Tie Breakdown
Latency Distribution (ms)
Breakdown
How the models stack up
| Metric | Cohere Rerank 4 Pro | Zerank 1 | Description |
|---|---|---|---|
| Overall Performance | |||
| ELO Rating | 1627 | 1574 | Overall ranking quality based on pairwise comparisons |
| Win Rate | 58.2% | 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 | 2025-12-11 | 2025-07-10 | Model release date |
| Accuracy Metrics | |||
| Avg nDCG@10 | N/A | 0.082 | Normalized discounted cumulative gain at position 10 |
| Performance Metrics | |||
| Avg Latency | 614ms | 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 | Cohere Rerank 4 Pro | Zerank 1 | Description |
|---|---|---|---|
| Latency Metrics | |||
| Mean | 458ms | 232ms | Average response time |
| P50 | 408ms | 226ms | 50th percentile (median) |
| P90 | 615ms | 245ms | 90th percentile |
arguana
| Metric | Cohere Rerank 4 Pro | Zerank 1 | Description |
|---|---|---|---|
| Latency Metrics | |||
| Mean | 785ms | 287ms | Average response time |
| P50 | 768ms | 275ms | 50th percentile (median) |
| P90 | 933ms | 332ms | 90th percentile |
FiQa
| Metric | Cohere Rerank 4 Pro | Zerank 1 | Description |
|---|---|---|---|
| Latency Metrics | |||
| Mean | 610ms | 259ms | Average response time |
| P50 | 585ms | 258ms | 50th percentile (median) |
| P90 | 817ms | 276ms | 90th percentile |
business reports
| Metric | Cohere Rerank 4 Pro | Zerank 1 | Description |
|---|---|---|---|
| Latency Metrics | |||
| Mean | 529ms | 289ms | Average response time |
| P50 | 498ms | 272ms | 50th percentile (median) |
| P90 | 675ms | 363ms | 90th percentile |
PG
| Metric | Cohere Rerank 4 Pro | Zerank 1 | Description |
|---|---|---|---|
| Latency Metrics | |||
| Mean | 760ms | 293ms | Average response time |
| P50 | 720ms | 279ms | 50th percentile (median) |
| P90 | 896ms | 348ms | 90th percentile |
DBPedia
| Metric | Cohere Rerank 4 Pro | Zerank 1 | Description |
|---|---|---|---|
| Latency Metrics | |||
| Mean | 541ms | 238ms | Average response time |
| P50 | 489ms | 233ms | 50th percentile (median) |
| P90 | 729ms | 257ms | 90th percentile |
Explore More
Compare more rerankers
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