How to Pick the Right Claude Every Time 📚

The Quick Version

Three models. One switch. Better outputs and lower credit burn the second you start using them right.

Sonnet is the daily driver. Strong reasoning, fast enough for real-time work, capable enough that most problems won't outgrow it. Anthropic specifically recommends Sonnet when you're not sure which model to use.

• Writing emails, reports, drafts
• Building docs, sheets, slides, presentations
• Multi-step workflows where you need it to think and act
• Normal coding tasks
• Research that needs reasoning (not just retrieval)
• Customer support, summarization, content creation
• Anything you'd ask a smart coworker

Example prompts

Opus is the reasoning specialist — built for problems that genuinely need deep thinking over multiple steps. Use it when accuracy matters more than speed, or when Sonnet's first answer feels too shallow.

• Long research projects with many sources
• Complex proposals, strategies, or business plans
• Multi-file Cowork sessions where Claude needs to hold a lot in its head
• Code refactors that span multiple files or systems
• Decisions where you need a real second opinion, not a summary
• Anything you'd hire a senior consultant to think through

Example prompts

Haiku is fast and lightweight. Most efficient with rate limits. Use it for the high-volume, low-complexity stuff that doesn't need a heavy model thinking it through.

• Quick fact lookups and definitions
• Simple summaries (an email, a paragraph, a meeting note)
• Classifying or labeling things in bulk
• Fast Q&A and one-shot answers
• Extracting specific info from a document
• Anything you'd Google — but smarter

Example prompts

These work whether you're using Haiku, Sonnet, or Opus. Five tiny habits that compound fast.