Claude Sonnet 4 vs Command R

Compare Claude Sonnet 4 and Command R: pricing, performance, context window, latency, and best use cases. Side-by-side comparison on XALEN.

Updated 2026-05-21 · By Abhishek Raj · Our methodology

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Feature Claude Sonnet 4 Command R
CategoryFrontierOpen Source
Parameters~500B35B
Context Window200K128K
Input Price$0.03/1M tokens$0.03/1M tokens
Output Price$0.15/1M tokens$0.06/1M tokens
Latency~350ms~250ms

Choose Claude Sonnet 4 when:

  • ✓ General Q&A
  • ✓ Content generation
  • ✓ Temple chatbots
Key Strengths:

Excellent reasoning-per-dollar, 200K context, Strong multilingual

Choose Command R when:

  • ✓ RAG applications
  • ✓ Q&A systems
  • ✓ Content generation
Key Strengths:

Good RAG, Cost-efficient, 128K context

Verdict: Claude Sonnet 4 vs Command R

For cost efficiency, Command R wins at $0.03/1M input tokens. For speed, Command R is faster at ~250ms. Claude Sonnet 4 excels at General Q&A while Command R is better for RAG applications. 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 Sonnet 4 costs $0.03/1M input tokens and $0.15/1M output tokens. Command R costs $0.03 input and $0.06 output. Both models are similarly priced. XALEN offers batch processing at 50% discount on both models.

Performance & Context

Claude Sonnet 4 has a 200K context window with ~350ms latency. Command R offers 128K context at ~250ms. Claude Sonnet 4 has the larger context window.

Best For

Claude Sonnet 4 (Frontier) is optimized for: General Q&A, Content generation, Temple chatbots. Command R (Open Source) works best for: RAG applications, Q&A systems, Content generation.

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 Sonnet 4
response_a = client.chat.completions.create(
    model="claude-sonnet-4",
    messages=[{"role": "user", "content": "Your question here"}]
)

# Use Command R
response_b = client.chat.completions.create(
    model="command-r",
    messages=[{"role": "user", "content": "Your question here"}]
)

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Frequently Asked Questions

Which is better, Claude Sonnet 4 or Command R?

Claude Sonnet 4 (Frontier, ~500B) offers Excellent reasoning-per-dollar. Command R (Open Source, 35B) offers Good RAG. Choose Claude Sonnet 4 for General Q&A or Command R for RAG applications.

How much does Claude Sonnet 4 cost vs Command R?

Claude Sonnet 4: $0.03/1M input, $0.15/1M output. Command R: $0.03/1M input, $0.06/1M 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 Sonnet 4 and Command R by changing the model parameter. No code changes needed.

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Last updated: 2026-05-21. Pricing and specifications may change. Check pricing page for latest rates.