Claude Opus 5 vs Grok 4
Claude Opus 5 
Grok 4 Verdict
- Claude Opus 5 leads on quality: 69.5 vs 58.6.
- Claude Opus 5 is stronger in agents & tools, coding, composite, human preference, knowledge, maths, multimodal, reasoning.
- Grok 4 is stronger in long context, instruction following.
- Grok 4 is 6.4× cheaper ($1.56 vs $10.00 per 1M blended).
| Metric | Claude Opus 5 | Grok 4 |
|---|---|---|
| BenchLeader Index | 69.5 | 58.6 |
| Agents & tools score | 71.5 | 55.3 |
| Coding score | 68.6 | 61.2 |
| Composite score | 93.2 | 57.4 |
| Human preference score | 78.2 | 59.8 |
| Knowledge score | 70.7 | 58.3 |
| Long context score | 66.2 | 69.0 |
| Maths score | 67.1 | 58.0 |
| Multimodal score | 69.4 | 53.8 |
| Reasoning score | 71.5 | 58.3 |
| Instruction following score | – | 62.4 |
| Blended price $/M | $10.00 | $1.56 |
| Output speed | 52 tok/s | – |
| Time to first answer | 79.0 s | – |
| Context window | 1M | 256k |
| GPQA Diamond | 92.9% | 87.0% |
| OTIS Mock AIME | 97.8% | 84.0% |
| Terminal-Bench | – | 27.2% |
| SimpleBench | 80.6% | 60.5% |
| Fiction.LiveBench 120k | – | 96.9% |
| Cybench | – | 43.0% |
| WeirdML | 86.3% | 45.7% |
| APEX-Agents | – | 15.2% |
| Epoch Capabilities Index | 162.6 | 146.4 |
| LMArena Text | – | 1411 |
| LMArena Hard Prompts | – | 1420 |
| LMArena Coding | – | 1435 |
| LMArena Vision | – | 1210 |
| AA Intelligence Index | 50.7 | 22.5 |
| IFBench | – | 53.7% |
| AA-LCR | 79.3% | 68.0% |
| MMMU-Pro | 84.7% | 68.8% |
| AA-Omniscience | 37.1 | 2.1 |
| Terminal-Bench Hard | – | 37.9% |
| GPQA Diamond (AA) | 93.2% | 87.7% |
| Humanity's Last Exam (AA) | 54.9% | 26.7% |
| SciCode (AA) | 56.4% | – |
| τ²-Bench Telecom (AA) | – | 74.8% |
| AIME (Vals) | – | 90.6% |
| LiveCodeBench | 89.0% | 83.3% |
| MMLU-Pro | 91.6% | 85.3% |
| IOI | 84.3% | – |
| LegalBench | 87.0% | 83.2% |
| CorpFin | 73.2% | 66.0% |
| TaxEval | 75.1% | 65.1% |
| MedQA | – | 92.5% |
| MGSM | – | 90.9% |
| Terminal-Bench 2.1 (Vals) | 84.6% | – |
| SWE-bench (Vals) | 97.0% | 57.8% |
| GPQA Diamond (Vals) | 93.4% | 88.1% |
| Vals Index | 67.2 | – |
| IMO 2025 | – | 21.4% |
| MathArena Apex | – | 2.1% |
| HiL-Bench | 57.0% | – |
| EQ-Bench 4 | 1385 | – |
| 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 | – | 79.6% |
| ARC-AGI-2 | – | 29.4% |
| 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.
Claude Opus 5 vs Grok 4: questions
- Is Claude Opus 5 better than Grok 4?
- Claude Opus 5 leads on quality: 69.5 vs 58.6. The BenchLeader Index combines every independent quality benchmark; Claude Opus 5 is ahead overall as of 2026-09-12, but check the category scores for your use.
- Is Claude Opus 5 better than Grok 4 for coding?
- Claude Opus 5 scores higher in coding (69 vs 61 on the category index, where 50 is average).
- Is Claude Opus 5 better than Grok 4 for agentic tasks?
- Claude Opus 5 scores higher in agentic tasks (72 vs 55 on the category index, where 50 is average).
- Which is cheaper, Claude Opus 5 or Grok 4?
- Grok 4 is cheaper: $1.56 against $10.00 per million tokens, blended at three input tokens per output token.
- Which has the larger context window?
- Claude Opus 5 accepts more context: 1M against 256k tokens.