Compare / Claude Opus 4.5 vs GPT-5.4 Nano
Claude Opus 4.5 vs GPT-5.4 Nano
17 results from 4 sources that measured both models. Each row is in the source's own units; there is no overall winner.
| Benchmark | Metric | Claude Opus 4.5 | GPT-5.4 Nano |
|---|---|---|---|
| Arena (formerly LMArena)reported | OverallArena rating | 1,459 | 1,418 |
| Arena (formerly LMArena)reported | Business, management and financeArena rating | 1,472 | 1,405 |
| Arena (formerly LMArena)reported | Creative writingArena rating | 1,469 | 1,335 |
| Arena (formerly LMArena)reported | Expert promptsArena rating | 1,503 | 1,438 |
| Arena (formerly LMArena)reported | Instruction followingArena rating | 1,483 | 1,387 |
| Arena (formerly LMArena)reported | OverallArena rating | 1,474 | 1,401 |
| Arena (formerly LMArena)reported | Writing, literature and languageArena rating | 1,467 | 1,362 |
| Artificial Analysisreported | Artificial Analysis Intelligence Indexindex score | 29.1 | 20.7 |
| Artificial Analysisreported | GPQA Diamond% of questions | 86.6% | 81.7% |
| Artificial Analysisreported | Humanity's Last Exam% of questions | 30.1% | 28.3% |
| Artificial Analysisreported | IFBench% of instructions | 58.0% | 75.9% |
| Artificial Analysisreported | Long-context reasoning (AA-LCR)% of questions | 77.3% | 76.7% |
| Artificial Analysisreported | Terminal-Bench Hard% of tasks | 47.0% | 42.4% |
| Artificial Analysisreported | Τ²-bench telecom% of tasks | 89.5% | 76.0% |
| SimpleQA Verified (Epoch AI)reported | Correct answers% of questions | 45.7% | 11.7% |
| Vectara Hallucination Leaderboardreported | Answer rate% of documents | 98.7% | 100.0% |
| Vectara Hallucination Leaderboardreported | Hallucination rate% of summaries | 10.9% | 3.1% |
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.