GPT-5.6 Sol vs Grok 4.3
GPT-5.6 Sol 
Grok 4.3 Verdict
- GPT-5.6 Sol (high) leads on quality: 68.2 vs 60.7.
- GPT-5.6 Sol (high) is stronger in agents & tools, coding, composite, knowledge, long context, multimodal, reasoning.
- Grok 4.3 (medium) is stronger in instruction following.
- Grok 4.3 (medium) is 5.1× cheaper ($1.56 vs $8.00 per 1M blended).
- Grok 4.3 (medium) streams 1.9× faster (112 vs 59 tokens per second).
| Metric | GPT-5.6 Sol (high) | Grok 4.3 (medium) |
|---|---|---|
| BenchLeader Index | 68.2 | 60.7 |
| Agents & tools score | 87.9 | 60.1 |
| Coding score | 72.4 | – |
| Composite score | 82.7 | 60.3 |
| Instruction following score | 67.8 | 80.0 |
| Knowledge score | 73.8 | 72.1 |
| Long context score | 67.4 | 64.0 |
| Multimodal score | 66.4 | 60.2 |
| Reasoning score | 63.3 | – |
| Blended price $/M | $8.00 | $1.56 |
| Output speed | 59 tok/s | 112 tok/s |
| Time to first answer | 31.0 s | 12.1 s |
| Context window | 1M | 1M |
| SciCode | 56.9% | – |
| WeirdML | 88.8% | – |
| AA Intelligence Index | 42.5 | 24.8 |
| IFBench | 69.2% | 83.3% |
| AA-LCR | 81.7% | 75.0% |
| MMMU-Pro | 81.8% | 75.8% |
| AA-Omniscience | 20.4 | 16.7 |
| Terminal-Bench Hard | 62.1% | 30.3% |
| GPQA Diamond (AA) | 92.8% | 89.0% |
| Humanity's Last Exam (AA) | 46.0% | 30.0% |
| SciCode (AA) | 57.8% | – |
| τ²-Bench Telecom (AA) | 83.3% | 91.2% |
| EnigmaEval | 37.1% | – |
| ARC-AGI-1 | 97.0% | – |
| ARC-AGI-2 | 85.4% | – |
| ARC-AGI-3 | 2.2% | – |
Data as of 2026-09-10. Best configuration of each model; every score links to its source on the model pages.
GPT-5.6 Sol vs Grok 4.3: questions
- Is GPT-5.6 Sol better than Grok 4.3?
- GPT-5.6 Sol (high) leads on quality: 68.2 vs 60.7. The BenchLeader Index combines every independent quality benchmark; GPT-5.6 Sol (high) is ahead overall as of 2026-09-10, but check the category scores for your use.
- Is GPT-5.6 Sol better than Grok 4.3 for agentic tasks?
- GPT-5.6 Sol scores higher in agentic tasks (88 vs 60 on the category index, where 50 is average).
- Which is cheaper, GPT-5.6 Sol or Grok 4.3?
- Grok 4.3 is cheaper: $1.56 against $8.00 per million tokens, blended at three input tokens per output token.
- Which is faster, GPT-5.6 Sol or Grok 4.3?
- Grok 4.3 streams faster: 112 against 59 output tokens per second.
- Which has the larger context window?
- Both accept 1M tokens of context.