Compare / Claude Sonnet 5.5 vs GPT-5.6 Terra
Claude Sonnet 5.5 vs GPT-5.6 Terra
7 results from 3 sources that measured both models. Each row is in the source's own units; there is no overall winner.
| Benchmark | Metric | Claude Sonnet 5.5 | GPT-5.6 Terra |
|---|---|---|---|
| APEX-Agentsreported | Tasks passed% of tasks | 75.5% | 58.2% |
| Artificial Analysisreported | Artificial Analysis Intelligence Indexindex score | 56.0 | 42.1 |
| Artificial Analysisreported | Humanity's Last Exam% of questions | 55.0% | 42.9% |
| Artificial Analysisreported | Long-context reasoning (AA-LCR)% of questions | 82.7% | 83.0% |
| Artificial Analysisreported | SciCode% of problems | 61.0% | 55.0% |
| Artificial Analysisreported | Terminal-Bench 4.0% of tasks | 63.6% | 35.4% |
| SimpleQA Verified (Epoch AI)reported | Correct answers% of questions | 46.5% | 43.2% |
Bold green marks the better value on that metric. Where a source reports ranges that overlap, the difference may not be meaningful; see the benchmark page for ranges.