Claude 3.7 Sonnet vs Claude Opus 5.5
A direct, empirical evaluation of Claude 3.7 Sonnet (Anthropic) against Claude Opus 5.5 (Anthropic).
Claude 3.7 Sonnet
Developed by Anthropic · Proprietary parameters
Enterprise software engineering, full-repo refactoring, and agentic workflows.
Claude Opus 5.5
Developed by Anthropic · Proprietary Frontier Reasoner parameters
Autonomous enterprise codebase migrations, GitHub Copilot multi-file edits, SWE-bench Pro issue resolution (89.9%), and CodeRabbit automated reviews.
| Metric | Claude 3.7 Sonnet | Claude Opus 5.5 |
|---|---|---|
| SWE-bench Verified | 70.3% | 89.9% |
| MMLU-Pro | 82.1% | 92.4% |
| MATH-500 | 96.2% | 97.2% |
| Context Window | 200,000 tokens | 500,000 tokens |
| Input Pricing (per 1M) | $3.00 | $4.00 |
| Output Pricing (per 1M) | $15.00 | $20.00 |