GPT-5.6 Sol vs Grok 4
GPT-5.6 Sol 
Grok 4 Verdict
- GPT-5.6 Sol (high) leads on quality: 68.2 vs 58.6.
- GPT-5.6 Sol (high) is stronger in agents & tools, coding, composite, instruction following, knowledge, multimodal, reasoning.
- Grok 4 is stronger in long context, human preference, maths.
- Grok 4 is 5.1× cheaper ($1.56 vs $8.00 per 1M blended).
| Metric | GPT-5.6 Sol (high) | Grok 4 |
|---|---|---|
| BenchLeader Index | 68.2 | 58.6 |
| Agents & tools score | 87.9 | 55.3 |
| Coding score | 72.4 | 61.2 |
| Composite score | 82.8 | 57.4 |
| Instruction following score | 67.8 | 62.4 |
| Knowledge score | 73.9 | 58.3 |
| Long context score | 67.4 | 69.0 |
| Multimodal score | 66.5 | 53.8 |
| Reasoning score | 63.3 | 58.3 |
| Human preference score | – | 59.8 |
| Maths score | – | 58.0 |
| Blended price $/M | $8.00 | $1.56 |
| Output speed | 60 tok/s | – |
| Time to first answer | 15.5 s | – |
| Context window | 1.1M | 256k |
| GPQA Diamond | – | 87.0% |
| OTIS Mock AIME | – | 84.0% |
| Terminal-Bench | – | 27.2% |
| SimpleBench | – | 60.5% |
| Fiction.LiveBench 120k | – | 96.9% |
| SciCode | 56.9% | – |
| Cybench | – | 43.0% |
| WeirdML | 88.8% | 45.7% |
| APEX-Agents | – | 15.2% |
| Epoch Capabilities Index | – | 146.4 |
| LMArena Text | – | 1411 |
| LMArena Hard Prompts | – | 1420 |
| LMArena Coding | – | 1435 |
| LMArena Vision | – | 1210 |
| AA Intelligence Index | 42.5 | 22.5 |
| IFBench | 69.2% | 53.7% |
| AA-LCR | 81.7% | 68.0% |
| MMMU-Pro | 81.8% | 68.8% |
| AA-Omniscience | 20.4 | 2.1 |
| Terminal-Bench Hard | 62.1% | 37.9% |
| GPQA Diamond (AA) | 92.8% | 87.7% |
| Humanity's Last Exam (AA) | 46.0% | 26.7% |
| SciCode (AA) | 57.8% | – |
| τ²-Bench Telecom (AA) | 83.3% | 74.8% |
| AIME (Vals) | – | 90.6% |
| LiveCodeBench | – | 83.3% |
| MMLU-Pro | – | 85.3% |
| LegalBench | – | 83.2% |
| CorpFin | – | 66.0% |
| TaxEval | – | 65.1% |
| MedQA | – | 92.5% |
| MGSM | – | 90.9% |
| SWE-bench (Vals) | – | 57.8% |
| GPQA Diamond (Vals) | – | 88.1% |
| IMO 2025 | – | 21.4% |
| MathArena Apex | – | 2.1% |
| EnigmaEval | 37.1% | – |
| Kagi LLM Benchmark | – | 73.6% |
| IFEval (HELM) | – | 94.9% |
| Omni-MATH (HELM) | – | 60.3% |
| WildBench (HELM) | – | 79.7% |
| MMLU-Pro (HELM) | – | 85.1% |
| GPQA Diamond (HELM) | – | 72.6% |
| HELM Capabilities mean | – | 78.5% |
| Aider Polyglot | – | 79.6% |
| ARC-AGI-1 | 97.0% | 79.6% |
| ARC-AGI-2 | 85.4% | 29.4% |
| ARC-AGI-3 | 2.2% | – |
| BFCL Overall | – | 63.0% |
Data as of 2026-09-12. Best configuration of each model; every score links to its source on the model pages.
GPT-5.6 Sol vs Grok 4: questions
- Is GPT-5.6 Sol better than Grok 4?
- GPT-5.6 Sol (high) leads on quality: 68.2 vs 58.6. The BenchLeader Index combines every independent quality benchmark; GPT-5.6 Sol (high) is ahead overall as of 2026-09-12, but check the category scores for your use.
- Is GPT-5.6 Sol better than Grok 4 for coding?
- GPT-5.6 Sol scores higher in coding (72 vs 61 on the category index, where 50 is average).
- Is GPT-5.6 Sol better than Grok 4 for agentic tasks?
- GPT-5.6 Sol scores higher in agentic tasks (88 vs 55 on the category index, where 50 is average).
- Which is cheaper, GPT-5.6 Sol or Grok 4?
- Grok 4 is cheaper: $1.56 against $8.00 per million tokens, blended at three input tokens per output token.
- Which has the larger context window?
- GPT-5.6 Sol accepts more context: 1.1M against 256k tokens.