Compare / GPT-5 vs GPT-5 Nano
GPT-5 vs GPT-5 Nano
16 results from 4 sources that measured both models. Each row is in the source's own units; there is no overall winner.
| Benchmark | Metric | GPT-5 | GPT-5 Nano |
|---|---|---|---|
| Arena (formerly LMArena)reported | Business, management and financeArena rating | 1,413 | 1,339 |
| Arena (formerly LMArena)reported | Creative writingArena rating | 1,373 | 1,247 |
| Arena (formerly LMArena)reported | Expert promptsArena rating | 1,460 | 1,354 |
| Arena (formerly LMArena)reported | Instruction followingArena rating | 1,410 | 1,327 |
| Arena (formerly LMArena)reported | OverallArena rating | 1,435 | 1,338 |
| Arena (formerly LMArena)reported | Writing, literature and languageArena rating | 1,397 | 1,289 |
| Artificial Analysisreported | Artificial Analysis Intelligence Indexindex score | 23.0 | 13.0 |
| Artificial Analysisreported | GPQA Diamond% of questions | 85.4% | 67.6% |
| Artificial Analysisreported | Humanity's Last Exam% of questions | 28.5% | 9.5% |
| Artificial Analysisreported | IFBench% of instructions | 73.1% | 67.6% |
| Artificial Analysisreported | Long-context reasoning (AA-LCR)% of questions | 78.2% | 45.0% |
| Artificial Analysisreported | Terminal-Bench Hard% of tasks | 37.9% | 17.4% |
| Artificial Analysisreported | Τ²-bench telecom% of tasks | 86.5% | 36.5% |
| SimpleQA Verified (Epoch AI)reported | Correct answers% of questions | 50.1% | 11.7% |
| Vectara Hallucination Leaderboardreported | Answer rate% of documents | 99.9% | 100.0% |
| Vectara Hallucination Leaderboardreported | Hallucination rate% of summaries | 14.7% | 10.5% |
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.