GPT-5 vs Grok 4.5
GPT-5 
Grok 4.5 Verdict
- Grok 4.5 leads on quality: 63.4 vs 60.8.
- GPT-5 is stronger in coding, instruction following, maths.
- Grok 4.5 is stronger in agents & tools, composite, human preference, knowledge, long context, multimodal, reasoning.
- They cost about the same ($3.00 per 1M blended).
- GPT-5 streams 1.5× faster (85 vs 55 tokens per second).
| Metric | GPT-5 | Grok 4.5 |
|---|---|---|
| BenchLeader Index | 60.8 | 63.4 |
| Agents & tools score | 51.0 | 58.4 |
| Coding score | 60.9 | 59.6 |
| Composite score | 58.1 | 66.2 |
| Human preference score | 61.7 | 66.9 |
| Instruction following score | 65.0 | – |
| Knowledge score | 62.2 | 76.3 |
| Long context score | 65.6 | 66.2 |
| Maths score | 72.8 | – |
| Multimodal score | 59.6 | 64.9 |
| Reasoning score | 64.2 | 69.1 |
| Blended price $/M | $3.44 | $3.00 |
| Output speed | 85 tok/s | 55 tok/s |
| Time to first answer | 60.7 s | 9.1 s |
| Context window | 400k | 500k |
| Terminal-Bench | 49.6% | – |
| SimpleBench | – | 70.0% |
| SciCode | 42.9% | – |
| Remote Labor Index | 1.7% | – |
| WeirdML | 39.8% | 46.4% |
| APEX-Agents | 18.3% | 34.2% |
| FrontierCode | – | 42.4% |
| Epoch Capabilities Index | 150 | 153.9 |
| LMArena Text | 1427 | 1469 |
| LMArena Hard Prompts | 1449 | 1493 |
| LMArena Coding | 1462 | 1519 |
| LMArena WebDev | – | 1555 |
| LMArena Vision | 1232 | 1291 |
| LMArena Agent | – | 3.8 |
| LiveBench | – | 75.8% |
| LiveBench Reasoning | – | 87.2% |
| LiveBench Coding | – | 68.6% |
| LiveBench Agentic Coding | – | 56.5% |
| LiveBench Mathematics | – | 90.8% |
| LiveBench Data Analysis | – | 73.0% |
| LiveBench Language | – | 82.8% |
| AA Intelligence Index | 23.0 | 39.1 |
| IFBench | 73.1% | – |
| AA-LCR | 78.2% | 79.3% |
| MMMU-Pro | 74.2% | 80.4% |
| AA-Omniscience | -8.7 | 25.3 |
| Terminal-Bench Hard | 32.6% | – |
| GPQA Diamond (AA) | 85.3% | 93.1% |
| Humanity's Last Exam (AA) | 28.5% | 42.7% |
| SciCode (AA) | – | 55.0% |
| τ²-Bench Telecom (AA) | 84.8% | – |
| PRBench Finance | 51.3% | – |
| PRBench Legal | 49.0% | – |
| VISTA | 49.7% | – |
| MultiNRC | 52.1% | – |
| TutorBench | 55.3% | – |
| Kagi LLM Benchmark | 72.7% | 83.5% |
| IFEval (HELM) | 87.5% | – |
| Omni-MATH (HELM) | 64.7% | – |
| WildBench (HELM) | 85.7% | – |
| MMLU-Pro (HELM) | 86.3% | – |
| GPQA Diamond (HELM) | 79.1% | – |
| HELM Capabilities mean | 80.7% | – |
| Aider Polyglot | 88.0% | – |
| SWE-bench Verified (any scaffold) | 75.6% | – |
Data as of 2026-09-12. Best configuration of each model; every score links to its source on the model pages.
GPT-5 vs Grok 4.5: questions
- Is GPT-5 better than Grok 4.5?
- Grok 4.5 leads on quality: 63.4 vs 60.8. The BenchLeader Index combines every independent quality benchmark; Grok 4.5 is ahead overall as of 2026-09-12, but check the category scores for your use.
- Is GPT-5 better than Grok 4.5 for coding?
- GPT-5 scores higher in coding (61 vs 60 on the category index, where 50 is average).
- Is GPT-5 better than Grok 4.5 for agentic tasks?
- Grok 4.5 scores higher in agentic tasks (58 vs 51 on the category index, where 50 is average).
- Which is cheaper, GPT-5 or Grok 4.5?
- Grok 4.5 is cheaper: $3.00 against $3.44 per million tokens, blended at three input tokens per output token.
- Which is faster, GPT-5 or Grok 4.5?
- GPT-5 streams faster: 85 against 55 output tokens per second.
- Which has the larger context window?
- Grok 4.5 accepts more context: 500k against 400k tokens.