Opus
The largest, most intelligent model in the Claude family, designed to handle the most highly complex, cognitively demanding tasks.
What it is
Opus is Anthropic's frontier model, utilizing significant computational resources to excel at deep analysis, strategic planning, and complex system architecture. Because it is slower and more expensive than Sonnet, it is typically reserved for tasks where precision and deep contextual reasoning are more important than speed.
When you would use it
You reach for Opus when you are stuck on a highly difficult, multi-layered problem and need the absolute highest level of AI reasoning available, regardless of token cost.
Common operations
- Designing high-level software architecture from scratch.
- Solving deeply entrenched, highly complex logical bugs that other models fail to resolve.