Claude Opus 4.8 vs GPT-5 Pro
Claude Opus 4.8 
GPT-5 Pro Verdict
- Claude Opus 4.8 leads on quality: 64.8 vs 60.8.
- Claude Opus 4.8 is stronger in agents & tools, coding, composite, human preference, instruction following, long context, reasoning.
- GPT-5 Pro is stronger in knowledge, multimodal.
- Claude Opus 4.8 is 4.1× cheaper ($10.00 vs $41.25 per 1M blended).
| Metric | Claude Opus 4.8 | GPT-5 Pro |
|---|---|---|
| BenchLeader Index | 64.8 | 60.8 |
| Agents & tools score | 65.0 | – |
| Coding score | 65.6 | – |
| Composite score | 82.1 | – |
| Human preference score | 65.8 | – |
| Instruction following score | 61.8 | – |
| Knowledge score | 66.5 | 68.0 |
| Long context score | 65.4 | – |
| Multimodal score | 64.5 | 67.4 |
| Reasoning score | 64.6 | 57.6 |
| Blended price $/M | $10.00 | $41.25 |
| Output speed | 56 tok/s | – |
| Time to first answer | 29.3 s | – |
| Context window | 1M | 400k |
| Humanity's Last Exam | – | 31.6% |
| SimpleBench | 64.8% | 61.6% |
| Remote Labor Index | 8.3% | – |
| FrontierCode | 46.5% | – |
| GSO-Bench | 47.1% | – |
| Epoch Capabilities Index | 158.3 | 150.3 |
| LMArena Text | 1473 | – |
| LMArena Hard Prompts | 1503 | – |
| LMArena Coding | 1527 | – |
| LMArena WebDev | 1540 | – |
| LMArena Vision | 1289 | – |
| AA Intelligence Index | 42.0 | – |
| IFBench | 62.2% | – |
| AA-LCR | 77.7% | – |
| AA-Omniscience | 28.8 | – |
| Terminal-Bench Hard | 58.3% | – |
| GPQA Diamond (AA) | 92.0% | – |
| Humanity's Last Exam (AA) | 48.7% | – |
| SciCode (AA) | 54.4% | – |
| τ²-Bench Telecom (AA) | 94.4% | – |
| LiveCodeBench | 87.8% | – |
| MMLU-Pro | 89.6% | – |
| LegalBench | 83.6% | – |
| CorpFin | 66.7% | – |
| TaxEval | 75.6% | – |
| Terminal-Bench 2.1 (Vals) | 71.9% | – |
| SWE-bench (Vals) | 88.6% | – |
| GPQA Diamond (Vals) | 92.4% | – |
| Vals Index | 60.9 | – |
| PRBench Finance | – | 51.1% |
| PRBench Legal | – | 49.9% |
| VISTA | – | 52.4% |
| MultiNRC | – | 65.2% |
| HiL-Bench | 35.3% | – |
| EQ-Bench 4 | 1281 | – |
| Kagi LLM Benchmark | – | 76.8% |
| ARC-AGI-1 | – | 70.2% |
| ARC-AGI-2 | – | 18.3% |
Data as of 2026-09-10. Best configuration of each model; every score links to its source on the model pages.
Claude Opus 4.8 vs GPT-5 Pro: questions
- Is Claude Opus 4.8 better than GPT-5 Pro?
- Claude Opus 4.8 leads on quality: 64.8 vs 60.8. The BenchLeader Index combines every independent quality benchmark; Claude Opus 4.8 is ahead overall as of 2026-09-10, but check the category scores for your use.
- Which is cheaper, Claude Opus 4.8 or GPT-5 Pro?
- Claude Opus 4.8 is cheaper: $10.00 against $41.25 per million tokens, blended at three input tokens per output token.
- Which has the larger context window?
- Claude Opus 4.8 accepts more context: 1M against 400k tokens.