Claude Opus 4.6 vs Claude Sonnet 4: Which Should You Use?
A detailed comparison between Claude Opus 4.6 and Claude Sonnet 4 covering performance, pricing, capabilities, and real-world benchmarks to help you choose the right model.
Claude Opus 4.6 is Anthropic's most capable model with top-tier reasoning and coding, priced at $15/M input tokens. Claude Sonnet 4 offers excellent performance at $3/M input tokens. Use Opus 4.6 for complex tasks; Sonnet 4 for general-purpose work.
The Quick Answer
Claude Opus 4.6 is Anthropic's most capable frontier model, while Claude Sonnet 4 remains the best value for general-purpose tasks. Opus 4.6 excels at complex reasoning, multi-step coding, and nuanced analysis at $15/M input tokens, whereas Sonnet 4 delivers excellent performance at just $3/M input tokens.Performance Comparison
Coding
Claude Opus 4.6 leads in coding benchmarks with:
- Superior understanding of large, complex codebases
- More accurate multi-file refactoring across dependencies
- Better at generating comprehensive test suites
- Stronger debugging of subtle logic errors
- Improved agentic coding with longer, more coherent tool-use sequences
Reasoning
Opus 4.6 outperforms Sonnet 4 on reasoning-heavy benchmarks, particularly:
- Mathematical and scientific reasoning
- Complex logical deduction
- Multi-step problem solving with many constraints
- Strategic planning and analysis
Writing Quality
Both models produce excellent writing:
- Opus 4.6: More nuanced tone control, better at long-form consistency
- Sonnet 4: Excellent for most writing tasks, fast and efficient
Speed
Sonnet 4 is significantly faster than Opus 4.6. For interactive applications and real-time use cases, Sonnet 4 provides a much better latency profile.
Pricing
| Aspect | Claude Opus 4.6 | Claude Sonnet 4 |
|---|---|---|
| Input | $15/M tokens | $3/M tokens |
| Output | $75/M tokens | $15/M tokens |
| Batch | 50% off | 50% off |
| Speed | Slower | 5x faster |
When to Use Each
Use Claude Opus 4.6 when:- You need the most capable reasoning available
- Working on complex, multi-step coding tasks
- Building sophisticated agentic workflows
- Quality matters more than speed or cost
- You need fast, responsive interactions
- Working on standard development tasks
- Building chatbots and interactive applications
- Cost efficiency is a priority
Migration Guide
Switching between models is straightforward — just change the model identifier in your API call:
claude-opus-4-6for Claude Opus 4.6claude-sonnet-4-6for Claude Sonnet 4 (latest point release)