Claude Opus 5.5 vs GPT-5.4 Pro
Claude Opus 5.5 
GPT-5.4 Pro Verdict
- Claude Opus 5.5 (thinking) leads on quality: 70.7 vs 64.0.
- Claude Opus 5.5 (thinking) is stronger in composite, knowledge, long context, multimodal, reasoning.
- GPT-5.4 Pro is stronger in instruction following.
- Claude Opus 5.5 (thinking) is 8.4× cheaper ($8.00 vs $67.50 per 1M blended).
- Claude Opus 5.5 (thinking) streams 32.0× faster (48 vs 2 tokens per second).
| Metric | Claude Opus 5.5 (thinking) | GPT-5.4 Pro |
|---|---|---|
| BenchLeader Index | 70.7 | 64.0 |
| Composite score | 95.0 | – |
| Knowledge score | 85.0 | 73.6 |
| Long context score | 68.5 | – |
| Multimodal score | 71.9 | 69.8 |
| Reasoning score | 95.0 | 73.2 |
| Instruction following score | – | 67.3 |
| Blended price $/M | $8.00 | $67.50 |
| Output speed | 48 tok/s | 2 tok/s |
| Time to first answer | 4.2 s | 5.5 s |
| Context window | 1M | 1.1M |
| Humanity's Last Exam | – | 44.3% |
| SimpleBench | – | 74.1% |
| Epoch Capabilities Index | – | 159.1 |
| AA Intelligence Index | 57.6 | – |
| AA-LCR | 84.7% | – |
| MMMU-Pro | 87.7% | – |
| AA-Omniscience | 46.4 | – |
| Humanity's Last Exam (AA) | 61.4% | – |
| SciCode (AA) | 66.9% | – |
| MultiChallenge | – | 69.2% |
| VISTA | – | 53.9% |
| MultiNRC | – | 62.3% |
| TutorBench | – | 56.6% |
| CritPt | 31.7% | – |
| GDPval (AA) | 67.3% | – |
| FORTRESS | – | 14.8% |
| MASK | – | 91.7% |
| Terminal-Bench 4.0 (AA) | 59.6% | – |
| AutomationBench | 69.5% | – |
| GDP.pdf | 26.2% | – |
| Harvey LAB | 91.2% | – |
| AA-Omniscience: accuracy | 66.2% | – |
| AA-Omniscience: non-hallucination | 41.4% | – |
| AA-Briefcase | 1822 | – |
Data as of 2026-09-22. Best configuration of each model; every score links to its source on the model pages.
Claude Opus 5.5 vs GPT-5.4 Pro: questions
- Is Claude Opus 5.5 better than GPT-5.4 Pro?
- Claude Opus 5.5 (thinking) leads on quality: 70.7 vs 64.0. The BenchLeader Index combines every independent quality benchmark; Claude Opus 5.5 (thinking) is ahead overall as of 2026-09-22, but check the category scores for your use.
- Which is cheaper, Claude Opus 5.5 or GPT-5.4 Pro?
- Claude Opus 5.5 is cheaper: $8.00 against $67.50 per million tokens, blended at three input tokens per output token.
- Which is faster, Claude Opus 5.5 or GPT-5.4 Pro?
- Claude Opus 5.5 streams faster: 48 against 2 output tokens per second.
- Which has the larger context window?
- GPT-5.4 Pro accepts more context: 1.1M against 1M tokens.