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
Frequently asked questions
What's new in Claude Opus 5?
Opus 5 is Anthropic's latest flagship, with stronger deep reasoning, markedly better agentic coding, and more reliable long-form output than Opus 4.7.
How does Opus 5 compare to Sonnet 5?
Opus 5 is the premium pick for the hardest tasks; Sonnet 5 delivers near-Opus quality on most coding and writing work at a lower credit cost.
Can Opus 5 handle very long documents?
Yes. Claude models support very large context windows, so Opus 5 can read long reports, contracts or whole codebases before answering.
Is Claude Opus 5 available on the free tier?
One free question per session - no signup needed. Higher usage requires a registered account or Pro plan.
