Claude Opus 5.5 vs Claude Sonnet 5.5
A direct, empirical evaluation of Claude Opus 5.5 (Anthropic) against Claude Sonnet 5.5 (Anthropic).
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.
Claude Sonnet 5.5
Developed by Anthropic · Proprietary Frontier Dynamic Hybrid Reasoner parameters
Terminal-Bench 4.0 execution (70.6%), SWE-bench Verified coding (82.4%), GitHub Copilot multi-file edits, and low-latency autonomous agentic coding at $2/$10 pricing.
| Metric | Claude Opus 5.5 | Claude Sonnet 5.5 |
|---|---|---|
| SWE-bench Verified | 89.9% | 82.4% |
| MMLU-Pro | 92.4% | 88.4% |
| MATH-500 | 97.2% | 95.2% |
| Context Window | 500,000 tokens | 1,000,000 tokens |
| Input Pricing (per 1M) | $4.00 | $2.00 |
| Output Pricing (per 1M) | $20.00 | $10.00 |