Claude Sonnet 4 Deep Dive: Top-Tier Coding Performance and Claude Code Explained
Anthropic has officially released Claude Sonnet 4, and its coding ability now tops the leaderboard across a wide range of benchmarks.
In this article, we’ll take a close look at Sonnet 4’s core features, how to use the Claude Code tool, and how it stacks up against mainstream models such as GPT and DeepSeek.
Claude Sonnet 4 Core Features
1. A Breakthrough in Programming Capability
Sonnet 4 scores 72.7% on the SWE-bench Verified benchmark, beating every comparable model on the market.
Specific improvements include:
- More stable multi-file refactoring
- A 30% improvement in understanding long codebase context
- Debugging skills approaching the level of a senior engineer
2. Enhanced Reasoning Depth
Compared with Sonnet 3.5, Sonnet 4 shows a clear leap in complex reasoning ability.
It performs especially well on math competitions, logic puzzles, and coding contests.
Claude Code in Detail
Claude Code is Anthropic’s command-line AI coding assistant. Its core features include:
- Code understanding: automatically indexes your project structure
- Smart editing: supports coordinated changes across multiple files
- Git integration: automatically creates commits and pull requests
- Test-driven development: automatically runs tests to verify your changes
API Usage Example
Model Comparison
| Model | Coding Ability | Reasoning Ability | Price (Input/Output) |
|---|---|---|---|
| Claude Sonnet 4 | 9.5/10 | 9.5/10 | $3/$15 per 1M |
| GPT-5.6 | 9.0/10 | 9.0/10 | $3/$12 per 1M |
| DeepSeek V4 | 8.8/10 | 8.5/10 | $0.14/$0.28 per 1M |
Summary
Claude Sonnet 4 is currently one of the most powerful large models for programming. Combined with the Claude Code tool, it can significantly improve your development efficiency.
If your project has high standards for code quality, it’s well worth giving it a try.