Claude Sonnet 5 vs GPT-5.4
Claude Sonnet 5 
GPT-5.4 Verdict
- GPT-5.4 leads on quality: 63.5 vs 61.4.
- Claude Sonnet 5 (high) is stronger in coding, human preference, reasoning.
- GPT-5.4 is stronger in agents & tools, composite, knowledge, long context, multimodal, instruction following.
- Claude Sonnet 5 (high) is 1.4× cheaper ($4.00 vs $5.63 per 1M blended).
- GPT-5.4 streams 2.2× faster (129 vs 60 tokens per second).
| Metric | Claude Sonnet 5 (high) | GPT-5.4 |
|---|---|---|
| BenchLeader Index | 61.4 | 63.5 |
| Agents & tools score | 61.8 | 66.2 |
| Coding score | 61.6 | 51.6 |
| Composite score | 69.5 | 78.3 |
| Human preference score | 66.2 | 64.7 |
| Knowledge score | 62.4 | 66.9 |
| Long context score | 64.8 | 67.6 |
| Multimodal score | 63.1 | 64.0 |
| Reasoning score | 66.8 | 62.6 |
| Instruction following score | – | 71.9 |
| Blended price $/M | $4.00 | $5.63 |
| Output speed | 60 tok/s | 129 tok/s |
| Time to first answer | 10.0 s | 124.6 s |
| Context window | 1M | 1.1M |
| Terminal-Bench | – | 81.8% |
| SciCode | 48.6% | – |
| WeirdML | 68.8% | – |
| APEX-Agents | – | 34.9% |
| Epoch Capabilities Index | – | 156.9 |
| LMArena Text | 1462 | 1466 |
| LMArena Hard Prompts | 1490 | 1488 |
| LMArena Coding | 1521 | 1514 |
| LMArena WebDev | 1538 | 1386 |
| LMArena Vision | 1278 | 1293 |
| LMArena Agent | 6.3 | – |
| AA Intelligence Index | 32.0 | 39.0 |
| IFBench | – | 74.0% |
| AA-LCR | 76.7% | 82.0% |
| MMMU-Pro | – | 78.4% |
| AA-Omniscience | -3.7 | 5.8 |
| Terminal-Bench Hard | – | 57.6% |
| GPQA Diamond (AA) | – | 92.0% |
| Humanity's Last Exam (AA) | 35.7% | 43.7% |
| SciCode (AA) | 54.3% | – |
| τ²-Bench Telecom (AA) | – | 87.1% |
| HiL-Bench | – | 9.7% |
| EQ-Bench 4 | – | 1272 |
| Kagi LLM Benchmark | – | 63.8% |
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-5.4: questions
- Is Claude Sonnet 5 better than GPT-5.4?
- GPT-5.4 leads on quality: 63.5 vs 61.4. The BenchLeader Index combines every independent quality benchmark; GPT-5.4 is ahead overall as of 2026-09-10, but check the category scores for your use.
- Is Claude Sonnet 5 better than GPT-5.4 for coding?
- Claude Sonnet 5 scores higher in coding (62 vs 52 on the category index, where 50 is average).
- Is Claude Sonnet 5 better than GPT-5.4 for agentic tasks?
- GPT-5.4 scores higher in agentic tasks (66 vs 62 on the category index, where 50 is average).
- Which is cheaper, Claude Sonnet 5 or GPT-5.4?
- Claude Sonnet 5 is cheaper: $4.00 against $5.63 per million tokens, blended at three input tokens per output token.
- Which is faster, Claude Sonnet 5 or GPT-5.4?
- GPT-5.4 streams faster: 129 against 60 output tokens per second.
- Which has the larger context window?
- GPT-5.4 accepts more context: 1.1M against 1M tokens.