Claude Opus 5.5 vs Grok 4.6
Claude Opus 5.5 
Grok 4.6 Verdict
- Claude Opus 5.5 (thinking) leads on quality: 70.7 vs 65.5.
- Claude Opus 5.5 (thinking) is stronger in composite, knowledge, long context, multimodal, reasoning.
- Grok 4.6 (medium) is stronger in agents & tools, coding.
- Grok 4.6 (medium) is 2.7× cheaper ($3.00 vs $8.00 per 1M blended).
| Metric | Claude Opus 5.5 (thinking) | Grok 4.6 (medium) |
|---|---|---|
| BenchLeader Index | 70.7 | 65.5 |
| Composite score | 95.0 | 81.4 |
| Knowledge score | 85.0 | 76.4 |
| Long context score | 68.5 | 66.6 |
| Multimodal score | 71.9 | – |
| Reasoning score | 95.0 | 66.9 |
| Agents & tools score | – | 73.3 |
| Coding score | – | 63.1 |
| Blended price $/M | $8.00 | $3.00 |
| Output speed | 48 tok/s | 59 tok/s |
| Time to first answer | 4.2 s | 35.3 s |
| Context window | 1M | 500k |
| SciCode | – | 54.6% |
| AA Intelligence Index | 57.6 | 42.8 |
| AA-LCR | 84.7% | 81.0% |
| MMMU-Pro | 87.7% | – |
| AA-Omniscience | 46.4 | 28 |
| GPQA Diamond (AA) | – | 93.5% |
| Humanity's Last Exam (AA) | 61.4% | 42.1% |
| SciCode (AA) | 66.9% | 55.9% |
| ARC-AGI-1 | – | 87.5% |
| ARC-AGI-2 | – | 61.3% |
| CritPt | 31.7% | 17.7% |
| GDPval (AA) | 67.3% | 55.2% |
| τ²-Bench Banking (AA) | – | 44.3% |
| DeepSWE | – | 67.5% |
| CursorBench | – | 36.1% |
| Terminal-Bench 4.0 (AA) | 59.6% | 13.1% |
| Terminal-Bench 2.1 (AA) | – | 84.3% |
| AutomationBench | 69.5% | – |
| GDP.pdf | 26.2% | – |
| Harvey LAB | 91.2% | – |
| AA-Omniscience: accuracy | 66.2% | 41.9% |
| AA-Omniscience: non-hallucination | 41.4% | 76.0% |
| AA-Briefcase | 1822 | – |
Data as of 2026-09-22. Best configuration of each model; every score links to its source on the model pages.
Claude Opus 5.5 vs Grok 4.6: questions
- Is Claude Opus 5.5 better than Grok 4.6?
- Claude Opus 5.5 (thinking) leads on quality: 70.7 vs 65.5. The BenchLeader Index combines every independent quality benchmark; Claude Opus 5.5 (thinking) is ahead overall as of 2026-09-22, but check the category scores for your use.
- Which is cheaper, Claude Opus 5.5 or Grok 4.6?
- Grok 4.6 is cheaper: $3.00 against $8.00 per million tokens, blended at three input tokens per output token.
- Which is faster, Claude Opus 5.5 or Grok 4.6?
- Grok 4.6 streams faster: 59 against 48 output tokens per second.
- Which has the larger context window?
- Claude Opus 5.5 accepts more context: 1M against 500k tokens.