Claude Opus 5 is Anthropic's newest flagship: a step-change in deep reasoning, agentic coding and long-horizon work over Opus 4.7.
What Claude Opus 5 is best for
The hardest reasoning, research and synthesis tasks
Large coding tasks: multi-file features, refactors and reviews
Long-form writing that must stay coherent over big outputs
Reading and reasoning over very long documents and codebases
High-stakes analysis where quality beats speed
How to use Claude Opus 5
Step 1
Give Claude Opus 5 the complete task up front - full documents, code and constraints in one go - and let it plan and execute rather than drip-feeding pieces.
Step 2
Ask for the deep version: tradeoffs, edge cases, counter-arguments and verification, which is where Opus 5 pulls furthest ahead of smaller models.
Step 3
Use follow-ups to have it cross-check its own output, reconcile contradictions across sources, or extend the work while holding a consistent voice.
Example prompts
Unlimited Claude Opus 5, free for 7 days
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