Claude Sonnet 4.5 — reviews, specs & pricing
Anthropic's strongest all-purpose Sonnet: excellent reasoning, coding, and long-context work at a mid-tier price.
Summary
Claude 4.5 Sonnet is Anthropic's premier mid-tier model designed to deliver elite-level reasoning, coding, and comprehension capabilities. It excels at deeply understanding complex prompts, maintaining context over large datasets, and producing highly articulate responses. This makes it an ideal balance of state-of-the-art intelligence and cost efficiency for demanding enterprise workflows.
Sample use case
A software development team can employ Claude 4.5 Sonnet to automate the refactoring of a legacy codebase by feeding it entire directories of old code. The model can accurately map dependencies, identify security vulnerabilities, and generate clean, updated code alongside comprehensive unit tests, dramatically accelerating the modernization process.
Specifications
- Provider: anthropic
- License: closed
- Context: 200k tokens
- Input price: $3/M tok
- Output price: $15/M tok
Pros
- Exceptional logic and coding proficiency
- Large, highly accurate context processing
- Superior instruction-following and nuance
- Distinguished balance of performance and price
Cons
- Slower speed compared to lightweight models
- Lacks built-in media generation features
- Premium pricing relative to basic utility models
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