Claude Sonnet 5 vs GPT-5 Pro
Claude Sonnet 5 
GPT-5 Pro Verdict
- Claude Sonnet 5 (high) and GPT-5 Pro are level on quality (61.4 vs 60.8).
- Claude Sonnet 5 (high) is stronger in agents & tools, coding, composite, human preference, long context, reasoning.
- GPT-5 Pro is stronger in knowledge, multimodal.
- Claude Sonnet 5 (high) is 10× cheaper ($4.00 vs $41.25 per 1M blended).
| Metric | Claude Sonnet 5 (high) | GPT-5 Pro |
|---|---|---|
| BenchLeader Index | 61.4 | 60.8 |
| Agents & tools score | 61.8 | – |
| Coding score | 61.6 | – |
| Composite score | 69.5 | – |
| Human preference score | 66.2 | – |
| Knowledge score | 62.4 | 68.0 |
| Long context score | 64.8 | – |
| Multimodal score | 63.1 | 67.4 |
| Reasoning score | 66.8 | 57.6 |
| Blended price $/M | $4.00 | $41.25 |
| Output speed | 60 tok/s | – |
| Time to first answer | 10.0 s | – |
| Context window | 1M | 400k |
| Humanity's Last Exam | – | 31.6% |
| SimpleBench | – | 61.6% |
| SciCode | 48.6% | – |
| WeirdML | 68.8% | – |
| Epoch Capabilities Index | – | 150.3 |
| LMArena Text | 1462 | – |
| LMArena Hard Prompts | 1490 | – |
| LMArena Coding | 1521 | – |
| LMArena WebDev | 1538 | – |
| LMArena Vision | 1278 | – |
| LMArena Agent | 6.3 | – |
| AA Intelligence Index | 32.0 | – |
| AA-LCR | 76.7% | – |
| AA-Omniscience | -3.7 | – |
| Humanity's Last Exam (AA) | 35.7% | – |
| SciCode (AA) | 54.3% | – |
| PRBench Finance | – | 51.1% |
| PRBench Legal | – | 49.9% |
| VISTA | – | 52.4% |
| MultiNRC | – | 65.2% |
| 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 Sonnet 5 vs GPT-5 Pro: questions
- Is Claude Sonnet 5 better than GPT-5 Pro?
- Claude Sonnet 5 (high) and GPT-5 Pro are level on quality (61.4 vs 60.8). The BenchLeader Index combines every independent quality benchmark; Claude Sonnet 5 (high) is ahead overall as of 2026-09-10, but check the category scores for your use.
- Which is cheaper, Claude Sonnet 5 or GPT-5 Pro?
- Claude Sonnet 5 is cheaper: $4.00 against $41.25 per million tokens, blended at three input tokens per output token.
- Which has the larger context window?
- Claude Sonnet 5 accepts more context: 1M against 400k tokens.