Claude Opus 4.5 — reviews, specs & pricing
Top-of-the-line Claude for the hardest tasks — deep reasoning, complex agents, careful writing. Expensive.
Summary
Claude 4.5 Opus is Anthropic's flagship model designed to tackle the most demanding cognitive tasks, offering unmatched depth in reasoning and precision. It is the premier choice for complex software engineering, multi-step agentic workflows, and highly nuanced creative or technical writing. While it sets a new benchmark for intelligence, its elite performance is accompanied by premium pricing and higher latency.
Sample use case
A multinational financial services firm can utilize Claude 4.5 Opus to power autonomous developer agents that safely migrate monolithic legacy codebases to cloud-native microservices. The model can ingest thousands of lines of undocumented legacy code, map complex dependency trees, systematically refactor the logic into clean Python, and automatically write comprehensive unit and integration tests.
Specifications
- Provider: anthropic
- License: closed
- Context: 200k tokens
- Input price: $15/M tok
- Output price: $75/M tok
Pros
- Unparalleled deep reasoning and analytical logic
- Exceptional multi-step agentic capabilities
- Meticulous, highly nuanced writing quality
- Superior complex coding and architecture design
Cons
- Significantly higher cost per token
- Slower generation speeds and higher latency
- Overkill for simple, high-volume tasks
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