Cohere: Rerank v3.5 vs VoyageAI by MongoDB: rerank-3
A side-by-side comparison of Cohere: Rerank v3.5 (Free) and VoyageAI by MongoDB: rerank-3 (Free) using current USD prices and capabilities from the api14 catalog. Both run through the same OpenAI-compatible API.
Specifications
| Cohere: Rerank v3.5 | VoyageAI by MongoDB: rerank-3 | |
|---|---|---|
| Provider | Cohere | VoyageAI by MongoDB |
| Context window | 4,096 | 32,000 |
| Max output | 3,686 | 28,800 |
| Input | text | text |
| Output | rerank | rerank |
| Tool calling | ||
| Structured output | ||
| Reasoning control | ||
| Added | Apr 5, 2026 | Sep 30, 2026 |
Key differences
- VoyageAI by MongoDB: rerank-3 reads 7.8× more context (32,000 tokens).
Switch with one string
Both models use the same endpoint and request shape. Change the model value from "cohere/rerank-v3.5" to "mongodb/rerank-3" and prompts, streaming and tools keep working.
import OpenAI from "openai";
const client = new OpenAI({
baseURL: "https://api14.com/api/v1",
apiKey: process.env.API14_API_KEY,
});
const result = await client.post("/rerank", { body: {
"model": "mongodb/rerank-3",
"query": "What is the capital of France?",
"documents": [
"Paris is the capital of France.",
"Berlin is in Germany."
],
"top_n": 1
} });
console.log(result.results);
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- Cohere: Rerank 5 Pro vs VoyageAI by MongoDB: rerank-3
- Cohere: Rerank 5 Pro vs VoyageAI by MongoDB: rerank-3-lite
- Cohere: Rerank 5 Pro vs Qwen3 Reranker 8B
- VoyageAI by MongoDB: rerank-3 vs VoyageAI by MongoDB: rerank-3-lite