Claude Opus 5.5 vs GLM-5-3 (Flagship)
A direct, empirical evaluation of Claude Opus 5.5 (Anthropic) against GLM-5-3 (Flagship) (Zhipu AI & THUDM).
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.
GLM-5-3 (Flagship)
Developed by Zhipu AI & THUDM · 744B parameters
Complex algorithmic reasoning, multi-step code synthesis, and long-horizon tool execution.
| Metric | Claude Opus 5.5 | GLM-5-3 (Flagship) |
|---|---|---|
| SWE-bench Verified | 89.9% | 54.8% |
| MMLU-Pro | 92.4% | 78.4% |
| MATH-500 | 97.2% | 93.6% |
| Context Window | 500,000 tokens | 256,000 tokens |
| Input Pricing (per 1M) | $4.00 | $0.55 |
| Output Pricing (per 1M) | $20.00 | $2.19 |