Claude Opus 4.5 vs Mistral Small 3

Compare Claude Opus 4.5 and Mistral Small 3: 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 4.5 Mistral Small 3
CategoryFrontierCompact
Parameters~2.5T24B
Context Window200K32K
Input Price$0.15/1M tokens$0.02/1M tokens
Output Price$0.75/1M tokens$0.04/1M tokens
Latency~900ms~150ms

Choose Claude Opus 4.5 when:

  • ✓ Creative writing
  • ✓ Complex analysis
  • ✓ Research
Key Strengths:

Superior creativity, Nuanced reasoning, Complex analysis

Choose Mistral Small 3 when:

  • ✓ Content classification
  • ✓ Intent detection
  • ✓ Preprocessing
Key Strengths:

Very fast, Low cost, Good classification

Verdict: Claude Opus 4.5 vs Mistral Small 3

For cost efficiency, Mistral Small 3 wins at $0.02/1M input tokens. For speed, Mistral Small 3 is faster at ~150ms. Claude Opus 4.5 excels at Creative writing while Mistral Small 3 is better for Content classification. 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. Mistral Small 3 costs $0.02 input and $0.04 output. Mistral Small 3 is 7.5x 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. Mistral Small 3 offers 32K context at ~150ms. Claude Opus 4.5 has the larger context window.

Best For

Claude Opus 4.5 (Frontier) is optimized for: Creative writing, Complex analysis, Research. Mistral Small 3 (Compact) works best for: Content classification, Intent detection, Preprocessing.

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 Mistral Small 3
response_b = client.chat.completions.create(
    model="mistral-small-3",
    messages=[{"role": "user", "content": "Your question here"}]
)

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Frequently Asked Questions

Which is better, Claude Opus 4.5 or Mistral Small 3?

Claude Opus 4.5 (Frontier, ~2.5T) offers Superior creativity. Mistral Small 3 (Compact, 24B) offers Very fast. Choose Claude Opus 4.5 for Creative writing or Mistral Small 3 for Content classification.

How much does Claude Opus 4.5 cost vs Mistral Small 3?

Claude Opus 4.5: $0.15/1M input, $0.75/1M output. Mistral Small 3: $0.02/1M input, $0.04/1M 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 Mistral Small 3 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.