Claude 4 Opus

Overview

Claude 4 Opus is Anthropic's most capable language model, excelling at complex analysis, nuanced writing, long-context tasks, and code generation. It features a large context window and strong instruction following.

Key Strengths

• Complex reasoning: Multi-step analysis and planning
• Code generation: Full-stack development, debugging, refactoring
• Long documents: Handles very long contexts without degradation
• Careful analysis: Less likely to hallucinate than competitors
• Instruction following: Excellent at following detailed system prompts

Prompt Techniques

System Prompts

Claude responds exceptionally well to detailed system prompts that define:

• Role and expertise
• Output format expectations
• Constraints and boundaries
• Tone and style

XML Tags

Claude understands XML tags for structured input:

<context>Background information here</context>
<task>What to do with it</task>
<format>How to structure the output</format>

Chain of Thought

Use "Think step by step" or "Before answering, analyze..." for complex reasoning tasks.

Tips

1. Be explicit about format — Claude will match whatever structure you define
2. Use examples — Claude excels at few-shot learning
3. Set constraints — "Under 200 words", "In bullet points", "As JSON"
4. Iterate — Claude maintains context well in long conversations
5. Leverage artifacts — Ask for code, documents, and analyses as standalone outputs