Claude Opus 5 vs Grok 4.20 Multi-Agent
Claude Opus 5 
Grok 4.20 Multi-Agent Verdict
- Claude Opus 5 (high) leads on quality: 70.2 vs 59.2.
- Claude Opus 5 (high) is stronger in agents & tools, coding, composite, human preference, knowledge, long context, maths, multimodal, reasoning.
- Grok 4.20 Multi-Agent is 6.4× cheaper ($1.56 vs $10.00 per 1M blended).
- Grok 4.20 Multi-Agent streams 5.2× faster (304 vs 59 tokens per second).
| Metric | Claude Opus 5 (high) | Grok 4.20 Multi-Agent |
|---|---|---|
| BenchLeader Index | 70.2 | 59.2 |
| Agents & tools score | 66.0 | – |
| Coding score | 71.9 | 65.5 |
| Composite score | 89.8 | – |
| Human preference score | 69.8 | 67.0 |
| Knowledge score | 80.0 | – |
| Long context score | 65.9 | – |
| Maths score | 72.3 | 64.4 |
| Multimodal score | 67.6 | 60.4 |
| Reasoning score | 75.6 | 65.9 |
| Blended price $/M | $10.00 | $1.56 |
| Output speed | 59 tok/s | 304 tok/s |
| Time to first answer | 14.4 s | 9.9 s |
| Context window | 1M | 1M |
| Terminal-Bench | 50.3% | – |
| OSWorld-Verified 2.0 | 29.0% | – |
| SciCode | 54.3% | – |
| WeirdML | 91.6% | – |
| LMArena Text | 1493 | 1470 |
| LMArena Hard Prompts | 1517 | 1483 |
| LMArena Coding | 1533 | 1508 |
| LMArena WebDev | 1660 | – |
| LMArena Vision | 1321 | 1260 |
| LMArena Agent | 10.2 | – |
| AA Intelligence Index | 48.1 | – |
| AA-LCR | 79.0% | – |
| MMMU-Pro | 82.4% | – |
| AA-Omniscience | 33.7 | – |
| GPQA Diamond (AA) | 93.7% | – |
| Humanity's Last Exam (AA) | 52.8% | – |
| SciCode (AA) | 55.4% | – |
| ARC-AGI-1 | 97.5% | – |
| ARC-AGI-2 | 88.3% | – |
| ARC-AGI-3 | 30.2% | – |
| CritPt | 28.3% | – |
| GDPval (AA) | 54.0% | – |
| τ²-Bench Banking (AA) | 44.7% | – |
| LMArena Maths | 1525 | 1453 |
| LMArena Creative Writing | 1474 | 1448 |
| LMArena Instruction Following | 1499 | 1443 |
| LMArena Multi-turn | 1484 | 1473 |
| LMArena Longer Queries | 1508 | 1457 |
| LMArena Search | – | 1205 |
| LMArena Document | 1490 | – |
| DeepSWE | 72.8% | – |
| CursorBench | 66.7% | – |
| ALE-Bench | 2164.6 | – |
Data as of 2026-09-21. Best configuration of each model; every score links to its source on the model pages.
Claude Opus 5 vs Grok 4.20 Multi-Agent: questions
- Is Claude Opus 5 better than Grok 4.20 Multi-Agent?
- Claude Opus 5 (high) leads on quality: 70.2 vs 59.2. The BenchLeader Index combines every independent quality benchmark; Claude Opus 5 (high) is ahead overall as of 2026-09-21, but check the category scores for your use.
- Is Claude Opus 5 better than Grok 4.20 Multi-Agent for coding?
- Claude Opus 5 scores higher in coding (72 vs 66 on the category index, where 50 is average).
- Which is cheaper, Claude Opus 5 or Grok 4.20 Multi-Agent?
- Grok 4.20 Multi-Agent is cheaper: $1.56 against $10.00 per million tokens, blended at three input tokens per output token.
- Which is faster, Claude Opus 5 or Grok 4.20 Multi-Agent?
- Grok 4.20 Multi-Agent streams faster: 304 against 59 output tokens per second.
- Which has the larger context window?
- Both accept 1M tokens of context.