GPT-5.5 vs Grok 4.1
GPT-5.5 
Grok 4.1 Verdict
- GPT-5.5 leads on quality: 65.0 vs 57.4.
- GPT-5.5 is stronger in coding, composite, human preference, instruction following, knowledge, long context, multimodal, reasoning.
- Grok 4.1 (thinking) is stronger in agents & tools, maths.
- Grok 4.1 (thinking) is 7.2× cheaper ($1.56 vs $11.25 per 1M blended).
| Metric | GPT-5.5 | Grok 4.1 (thinking) |
|---|---|---|
| BenchLeader Index | 65.0 | 57.4 |
| Agents & tools score | 67.6 | 78.3 |
| Coding score | 57.2 | 47.5 |
| Composite score | 71.1 | – |
| Human preference score | 67.7 | 66.4 |
| Instruction following score | 70.5 | – |
| Knowledge score | 70.5 | 57.2 |
| Long context score | 66.6 | – |
| Multimodal score | 64.3 | 53.2 |
| Reasoning score | 70.0 | 58.9 |
| Maths score | – | 48.3 |
| Blended price $/M | $11.25 | $1.56 |
| Output speed | 91 tok/s | – |
| Time to first answer | 49.6 s | – |
| Context window | 1.1M | 2M |
| Terminal-Bench | 84.7% | – |
| SimpleBench | 69.0% | 56.0% |
| Remote Labor Index | 6.3% | – |
| APEX-Agents | 38.5% | – |
| FrontierCode | 43.0% | – |
| ProofBench | – | 4.0% |
| Epoch Capabilities Index | 159.1 | – |
| LMArena Text | 1476 | 1465 |
| LMArena Hard Prompts | 1498 | 1477 |
| LMArena Coding | 1509 | 1499 |
| LMArena WebDev | 1458 | 1240 |
| LMArena Vision | 1296 | 1199 |
| LMArena Agent | 2.8 | – |
| AA Intelligence Index | 38.6 | – |
| IFBench | 75.8% | – |
| AA-LCR | 84.3% | – |
| MMMU-Pro | 79.9% | – |
| AA-Omniscience | 20.5 | – |
| Terminal-Bench Hard | 60.6% | – |
| GPQA Diamond (AA) | 93.5% | – |
| Humanity's Last Exam (AA) | 45.8% | – |
| SciCode (AA) | 55.8% | – |
| τ²-Bench Telecom (AA) | 93.9% | – |
| AIME (Vals) | – | 91.9% |
| LiveCodeBench | – | 80.6% |
| MMLU-Pro | – | 84.2% |
| LegalBench | – | 82.5% |
| CorpFin | – | 66.0% |
| TaxEval | – | 73.1% |
| MedQA | – | 92.1% |
| MGSM | – | 89.5% |
| SWE-bench (Vals) | – | 41.4% |
| GPQA Diamond (Vals) | – | 84.3% |
| AIME 2026 | – | 94.2% |
| HMMT February 2026 | – | 86.4% |
| MathArena Apex | – | 5.2% |
| HiL-Bench | 39.7% | – |
| EQ-Bench 4 | 1315 | – |
| Kagi LLM Benchmark | 88.8% | – |
| BFCL Overall | – | 69.6% |
Data as of 2026-09-13. Best configuration of each model; every score links to its source on the model pages.
GPT-5.5 vs Grok 4.1: questions
- Is GPT-5.5 better than Grok 4.1?
- GPT-5.5 leads on quality: 65.0 vs 57.4. The BenchLeader Index combines every independent quality benchmark; GPT-5.5 is ahead overall as of 2026-09-13, but check the category scores for your use.
- Is GPT-5.5 better than Grok 4.1 for coding?
- GPT-5.5 scores higher in coding (57 vs 48 on the category index, where 50 is average).
- Is GPT-5.5 better than Grok 4.1 for agentic tasks?
- Grok 4.1 scores higher in agentic tasks (78 vs 68 on the category index, where 50 is average).
- Which is cheaper, GPT-5.5 or Grok 4.1?
- Grok 4.1 is cheaper: $1.56 against $11.25 per million tokens, blended at three input tokens per output token.
- Which has the larger context window?
- Grok 4.1 accepts more context: 2M against 1.1M tokens.