Claude Opus 4.6 vs Grok 4.3
Claude Opus 4.6 
Grok 4.3 Verdict
- Claude Opus 4.6 leads on quality: 63.3 vs 60.7.
- Claude Opus 4.6 is stronger in agents & tools, coding, composite, human preference, long context, maths, multimodal, reasoning.
- Grok 4.3 (medium) is stronger in instruction following, knowledge.
- Grok 4.3 (medium) is 6.4× cheaper ($1.56 vs $10.00 per 1M blended).
- Grok 4.3 (medium) streams 3.1× faster (112 vs 36 tokens per second).
| Metric | Claude Opus 4.6 | Grok 4.3 (medium) |
|---|---|---|
| BenchLeader Index | 63.3 | 60.7 |
| Agents & tools score | 68.8 | 60.1 |
| Coding score | 62.4 | – |
| Composite score | 69.4 | 60.3 |
| Human preference score | 64.9 | – |
| Instruction following score | 53.9 | 80.0 |
| Knowledge score | 70.6 | 72.1 |
| Long context score | 65.5 | 64.0 |
| Maths score | 65.7 | – |
| Multimodal score | 63.6 | 60.2 |
| Reasoning score | 62.6 | – |
| Blended price $/M | $10.00 | $1.56 |
| Output speed | 36 tok/s | 112 tok/s |
| Time to first answer | 2.4 s | 12.1 s |
| Context window | 1M | 1M |
| GPQA Diamond | 90.5% | – |
| OTIS Mock AIME | 94.4% | – |
| SWE-bench Verified (Epoch) | 78.7% | – |
| Humanity's Last Exam | 19.0% | – |
| Terminal-Bench | 79.8% | – |
| SimpleBench | 67.6% | – |
| Cybench | 93.0% | – |
| Remote Labor Index | 4.2% | – |
| WeirdML | 77.9% | – |
| APEX-Agents | 32.4% | – |
| FrontierCode | 26.6% | – |
| GSO-Bench | 33.3% | – |
| Epoch Capabilities Index | 155.3 | – |
| LMArena Text | 1498 | – |
| LMArena Hard Prompts | 1527 | – |
| LMArena Coding | 1546 | – |
| LMArena WebDev | 1537 | – |
| LMArena Vision | 1311 | – |
| AA Intelligence Index | 31.9 | 24.8 |
| IFBench | 53.1% | 83.3% |
| AA-LCR | 78.0% | 75.0% |
| MMMU-Pro | 75.4% | 75.8% |
| AA-Omniscience | 13.7 | 16.7 |
| Terminal-Bench Hard | 48.5% | 30.3% |
| GPQA Diamond (AA) | 89.6% | 89.0% |
| Humanity's Last Exam (AA) | 39.9% | 30.0% |
| τ²-Bench Telecom (AA) | 92.1% | 91.2% |
| HiL-Bench | 38.3% | – |
| EQ-Bench 4 | 1223 | – |
| Kagi LLM Benchmark | 72.4% | – |
| SWE-bench Verified (bash only) | 75.6% | – |
| SWE-bench Verified (any scaffold) | 75.6% | – |
Data as of 2026-09-10. Best configuration of each model; every score links to its source on the model pages.
Claude Opus 4.6 vs Grok 4.3: questions
- Is Claude Opus 4.6 better than Grok 4.3?
- Claude Opus 4.6 leads on quality: 63.3 vs 60.7. The BenchLeader Index combines every independent quality benchmark; Claude Opus 4.6 is ahead overall as of 2026-09-10, but check the category scores for your use.
- Is Claude Opus 4.6 better than Grok 4.3 for agentic tasks?
- Claude Opus 4.6 scores higher in agentic tasks (69 vs 60 on the category index, where 50 is average).
- Which is cheaper, Claude Opus 4.6 or Grok 4.3?
- Grok 4.3 is cheaper: $1.56 against $10.00 per million tokens, blended at three input tokens per output token.
- Which is faster, Claude Opus 4.6 or Grok 4.3?
- Grok 4.3 streams faster: 112 against 36 output tokens per second.
- Which has the larger context window?
- Both accept 1M tokens of context.