GPT-5.1 vs GPT-5.4 Pro
GPT-5.1 Verdict
- GPT-5.4 Pro leads on quality: 64.3 vs 58.1.
- GPT-5.1 is stronger in agents & tools, coding, composite, human preference, instruction following, long context, maths.
- GPT-5.4 Pro is stronger in knowledge, multimodal, reasoning.
- GPT-5.1 is 20× cheaper ($3.44 vs $67.50 per 1M blended).
- GPT-5.1 streams 104.4× faster (104 vs 1 tokens per second).
| Metric | GPT-5.1 | GPT-5.4 Pro |
|---|---|---|
| BenchLeader Index | 58.1 | 64.3 |
| Agents & tools score | 54.4 | – |
| Coding score | 47.0 | – |
| Composite score | 54.9 | – |
| Human preference score | 63.2 | – |
| Instruction following score | 69.4 | 67.3 |
| Knowledge score | 63.3 | 73.6 |
| Long context score | 64.1 | – |
| Maths score | 57.1 | – |
| Multimodal score | 61.1 | 69.8 |
| Reasoning score | 58.7 | 75.3 |
| Blended price $/M | $3.44 | $67.50 |
| Output speed | 104 tok/s | 1 tok/s |
| Time to first answer | 23.3 s | 6.3 s |
| Context window | 400k | 1.1M |
| Humanity's Last Exam | 23.7% | 44.3% |
| Terminal-Bench | 47.6% | – |
| SimpleBench | – | 74.1% |
| SciCode | 43.3% | – |
| APEX-Agents | 17.5% | – |
| GSO-Bench | 13.7% | – |
| Epoch Capabilities Index | 149.7 | 158.9 |
| LMArena Text | 1439 | – |
| LMArena Hard Prompts | 1456 | – |
| LMArena Coding | 1475 | – |
| LMArena WebDev | 1341 | – |
| LMArena Vision | 1235 | – |
| AA Intelligence Index | 24.7 | – |
| IFBench | 72.9% | – |
| AA-LCR | 80.0% | – |
| MMMU-Pro | 75.5% | – |
| AA-Omniscience | 5.4 | – |
| Terminal-Bench Hard | 45.5% | – |
| GPQA Diamond (AA) | 87.3% | – |
| Humanity's Last Exam (AA) | 28.5% | – |
| τ²-Bench Telecom (AA) | 81.9% | – |
| MultiChallenge | – | 69.2% |
| VISTA | – | 53.9% |
| MultiNRC | – | 62.3% |
| TutorBench | – | 56.6% |
| MMMU (validation) | 85.4% | – |
| MMMU-Pro (official) | 76.0% | – |
| IFEval (HELM) | 93.5% | – |
| Omni-MATH (HELM) | 46.4% | – |
| WildBench (HELM) | 86.3% | – |
| MMLU-Pro (HELM) | 57.9% | – |
| GPQA Diamond (HELM) | 44.2% | – |
| HELM Capabilities mean | 65.6% | – |
Data as of 2026-09-13. Best configuration of each model; every score links to its source on the model pages.
GPT-5.1 vs GPT-5.4 Pro: questions
- Is GPT-5.1 better than GPT-5.4 Pro?
- GPT-5.4 Pro leads on quality: 64.3 vs 58.1. The BenchLeader Index combines every independent quality benchmark; GPT-5.4 Pro is ahead overall as of 2026-09-13, but check the category scores for your use.
- Which is cheaper, GPT-5.1 or GPT-5.4 Pro?
- GPT-5.1 is cheaper: $3.44 against $67.50 per million tokens, blended at three input tokens per output token.
- Which is faster, GPT-5.1 or GPT-5.4 Pro?
- GPT-5.1 streams faster: 104 against 1 output tokens per second.
- Which has the larger context window?
- GPT-5.4 Pro accepts more context: 1.1M against 400k tokens.