Claude Opus 4 vs Claude Sonnet 4.5

Compare Claude Opus 4 and Claude Sonnet 4.5: pricing, performance, context window, latency, and best use cases. Side-by-side comparison on XALEN.

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

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Feature Claude Opus 4 Claude Sonnet 4.5
CategoryFrontierFrontier
Parameters~2T~600B
Context Window200K200K
Input Price$0.15/1M tokens$0.03/1M tokens
Output Price$0.75/1M tokens$0.15/1M tokens
Latency~800ms~350ms

Choose Claude Opus 4 when:

  • ✓ Complex counseling
  • ✓ Detailed chart analysis
  • ✓ Enterprise reports
Key Strengths:

Deepest reasoning, Exceptional nuance, Best complex analysis

Choose Claude Sonnet 4.5 when:

  • ✓ Code generation
  • ✓ Structured output
  • ✓ Automation
Key Strengths:

Strong coding, Better instruction following, Reliable

Verdict: Claude Opus 4 vs Claude Sonnet 4.5

For cost efficiency, Claude Sonnet 4.5 wins at $0.03/1M input tokens. For speed, Claude Sonnet 4.5 is faster at ~350ms. Claude Opus 4 excels at Complex counseling while Claude Sonnet 4.5 is better for Code generation. 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 costs $0.15/1M input tokens and $0.75/1M output tokens. Claude Sonnet 4.5 costs $0.03 input and $0.15 output. Claude Sonnet 4.5 is 5.0x cheaper on input tokens. XALEN offers batch processing at 50% discount on both models.

Performance & Context

Claude Opus 4 has a 200K context window with ~800ms latency. Claude Sonnet 4.5 offers 200K context at ~350ms. Both have identical context windows.

Best For

Claude Opus 4 (Frontier) is optimized for: Complex counseling, Detailed chart analysis, Enterprise reports. Claude Sonnet 4.5 (Frontier) works best for: Code generation, Structured output, Automation.

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

# Use Claude Sonnet 4.5
response_b = client.chat.completions.create(
    model="claude-sonnet-4-5",
    messages=[{"role": "user", "content": "Your question here"}]
)

Start Building with XALEN

200+ AI models. One API. Pay-as-you-go.

Get API Key Try in Playground

Frequently Asked Questions

Which is better, Claude Opus 4 or Claude Sonnet 4.5?

Claude Opus 4 (Frontier, ~2T) offers Deepest reasoning. Claude Sonnet 4.5 (Frontier, ~600B) offers Strong coding. Choose Claude Opus 4 for Complex counseling or Claude Sonnet 4.5 for Code generation.

How much does Claude Opus 4 cost vs Claude Sonnet 4.5?

Claude Opus 4: $0.15/1M input, $0.75/1M output. Claude Sonnet 4.5: $0.03/1M input, $0.15/1M 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 and Claude Sonnet 4.5 by changing the model parameter. No code changes needed.

Related Comparisons

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