Anthropic Claude Sonnet 4.5
Claude Sonnet 4.5 is a Anthropic chat model built for deep reasoning, coding, and multilingual answers.
What is Claude Sonnet 4.5?
Claude Sonnet 4.5 is a premium large language model from Anthropic, tuned for analysis, coding, and long-form writing. It handles complex prompts with step-by-step reasoning, structured outputs for tools, and multilingual responses with controllable tone. Use it for hard problem solving, code review and generation, or content creation where quality and safety matter.
Technical Specifications
200K token
8192 token
2025
Active
Capabilities
Benchmark Scores
Pros & Cons
Pros
- Strong reasoning quality for complex prompts
- Supports long-context workflows
- Reliable multilingual output
Cons
- Higher cost than lightweight models
- Slower on very long prompts
- Needs clear instructions for optimal results
Features
Reasoning-first
Prioritizes faithful, step-by-step answers for hard questions.
Context memory
Handles long inputs (200K token) to keep discussions grounded.
Tool-friendly
Outputs JSON- or function-ready responses for automation.
Use Cases
Knowledge assistant
Ask Claude Sonnet 4.5 to summarize docs, compare options, and draft decisions.
Developer co-pilot
Review code, explain diffs, and generate snippets with tests.
Content and strategy
Produce outlines, articles, briefs, and customer messaging quickly.