by Anthropic
Balanced performance model — fast, capable, and cost-effective for most tasks.
Claude 4 Sonnet by Anthropic is the best balance of intelligence, speed, and cost in the Claude family. It handles most tasks at near-Opus quality but 5x faster and 5x cheaper.
Claude responds especially well to XML-structured prompts:
<task>Analyze this customer feedback</task>
<context>We're a B2B SaaS company selling project management tools</context>
<feedback>{{customer_feedback}}</feedback>
<output_format>
- Sentiment (positive/negative/neutral)
- Key themes (bullet list)
- Suggested action items
</output_format>
Claude Sonnet works best with clear, direct instructions. Avoid being overly polite or hedging:
BAD: "Could you maybe try to possibly summarize this?"
GOOD: "Summarize this in 3 bullet points, max 20 words each."
Sonnet performs well with specific role assignments:
You are a senior Python developer with 15 years of experience in Django and FastAPI. Review this code for performance issues and security vulnerabilities.
| Use Case | Quality |
|---|---|
| Code generation & review | Excellent |
| Content writing & editing | Very Good |
| Data analysis & extraction | Excellent |
| Customer support automation | Excellent |
| Summarization | Very Good |
| Translation | Good |
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