Claude Opus 4.5 vs Cohere Rerank 3.5
Compare Claude Opus 4.5 and Cohere Rerank 3.5: pricing, performance, context window, latency, and best use cases. Side-by-side comparison on XALEN.
Updated 2026-05-21 · By Abhishek Raj · Our methodology
| Feature | Claude Opus 4.5 | Cohere Rerank 3.5 |
|---|---|---|
| Category | Frontier | Reranking |
| Parameters | ~2.5T | ~600M |
| Context Window | 200K | 4K |
| Input Price | $0.15/1M tokens | $0.002/search/1M tokens |
| Output Price | $0.75/1M tokens | N/A/1M tokens |
| Latency | ~900ms | ~25ms |
Choose Claude Opus 4.5 when:
- ✓ Creative writing
- ✓ Complex analysis
- ✓ Research
Superior creativity, Nuanced reasoning, Complex analysis
Choose Cohere Rerank 3.5 when:
- ✓ Search reranking
- ✓ RAG improvement
- ✓ Result quality
Higher quality, Multilingual, Fast
Verdict: Claude Opus 4.5 vs Cohere Rerank 3.5
For cost efficiency, Cohere Rerank 3.5 wins at $0.002/search/1M input tokens. For speed, Cohere Rerank 3.5 is faster at ~25ms. Claude Opus 4.5 excels at Creative writing while Cohere Rerank 3.5 is better for Search reranking. Both are available on XALEN through a single API — try them in the Playground to see which fits your workload.
Detailed Analysis
Pricing Comparison
Claude Opus 4.5 costs $0.15/1M input tokens and $0.75/1M output tokens. Cohere Rerank 3.5 costs $0.002/search input and N/A output. Cohere Rerank 3.5 is 75.0x cheaper on input tokens. XALEN offers batch processing at 50% discount on both models.
Performance & Context
Claude Opus 4.5 has a 200K context window with ~900ms latency. Cohere Rerank 3.5 offers 4K context at ~25ms. Claude Opus 4.5 has the larger context window.
Best For
Claude Opus 4.5 (Frontier) is optimized for: Creative writing, Complex analysis, Research. Cohere Rerank 3.5 (Reranking) works best for: Search reranking, RAG improvement, Result quality.
Try Both on XALEN
Both models are available through XALEN's OpenAI-compatible API. Switch between them by changing the model parameter:
from xalen import XALEN
client = XALEN(api_key="xln_test_YOUR_KEY")
# Use Claude Opus 4.5
response_a = client.chat.completions.create(
model="claude-opus-4-5",
messages=[{"role": "user", "content": "Your question here"}]
)
# Use Cohere Rerank 3.5
response_b = client.chat.completions.create(
model="rerank-v3-5",
messages=[{"role": "user", "content": "Your question here"}]
)Frequently Asked Questions
Which is better, Claude Opus 4.5 or Cohere Rerank 3.5?
Claude Opus 4.5 (Frontier, ~2.5T) offers Superior creativity. Cohere Rerank 3.5 (Reranking, ~600M) offers Higher quality. Choose Claude Opus 4.5 for Creative writing or Cohere Rerank 3.5 for Search reranking.
How much does Claude Opus 4.5 cost vs Cohere Rerank 3.5?
Claude Opus 4.5: $0.15/1M input, $0.75/1M output. Cohere Rerank 3.5: $0.002/search/1M input, N/A/1M output. Both available on XALEN with batch processing at 50% discount.
Can I use both models on XALEN?
Yes. XALEN provides 200+ models through a single OpenAI-compatible API. Switch between Claude Opus 4.5 and Cohere Rerank 3.5 by changing the model parameter. No code changes needed.
Related Comparisons
Last updated: 2026-05-21. Pricing and specifications may change. Check pricing page for latest rates.