Compare / Claude Opus 5 vs Grok 4.5
Claude Opus 5 vs Grok 4.5
27 results from 7 sources that measured both models. Each row is in the source's own units; there is no overall winner.
| Benchmark | Metric | Claude Opus 5 | Grok 4.5 |
|---|---|---|---|
| APEX-Agentsreported | Tasks passed% of tasks | 65.8% | 56.2% |
| Arena (formerly LMArena)reported | Confirmed task successIPS effect estimate | 0.10 | -0.01 |
| Arena (formerly LMArena)reported | Praise over complaintIPS effect estimate | 0.18 | -0.03 |
| Arena (formerly LMArena)reported | SteerabilityIPS effect estimate | 0.11 | 0.04 |
| Arena (formerly LMArena)reported | Tool groundingIPS effect estimate | 0.00 | 0.00 |
| Arena (formerly LMArena)reported | OverallArena rating | 1,490 | 1,464 |
| Arena (formerly LMArena)reported | OverallArena rating | 1,488 | 1,465 |
| Arena (formerly LMArena)reported | Business, management and financeArena rating | 1,486 | 1,465 |
| Arena (formerly LMArena)reported | Creative writingArena rating | 1,472 | 1,452 |
| Arena (formerly LMArena)reported | Expert promptsArena rating | 1,543 | 1,488 |
| Arena (formerly LMArena)reported | Instruction followingArena rating | 1,497 | 1,462 |
| Arena (formerly LMArena)reported | OverallArena rating | 1,491 | 1,465 |
| Arena (formerly LMArena)reported | Writing, literature and languageArena rating | 1,482 | 1,459 |
| Artificial Analysisreported | Artificial Analysis Coding Indexindex score | 78.0 | 72.4 |
| Artificial Analysisreported | Artificial Analysis Intelligence Indexindex score | 50.8 | 38.8 |
| Artificial Analysisreported | GPQA Diamond% of questions | 93.7% | 93.1% |
| Artificial Analysisreported | Humanity's Last Exam% of questions | 54.9% | 42.7% |
| Artificial Analysisreported | Long-context reasoning (AA-LCR)% of questions | 82.0% | 79.3% |
| Artificial Analysisreported | SciCode% of problems | 56.4% | 55.0% |
| Artificial Analysisreported | Terminal-Bench 2.1% of tasks | 89.1% | 81.6% |
| Artificial Analysisreported | Terminal-Bench 4.0% of tasks | 49.0% | 10.6% |
| Artificial Analysisreported | Τ-bench banking% of tasks | 44.7% | 42.1% |
| GDP.pdfreported | Professional document tasks% of rubric | 24.0% | 14.0% |
| SimpleQA Verified (Epoch AI)reported | Correct answers% of questions | 59.9% | 48.3% |
| tau2-benchreported | Consistency (pass^4)% of tasks | 32.0% | 32.0% |
| tau2-benchreported | Task success (pass^1)% of tasks | 48.7% | 47.9% |
| Vending-Bench 2reported | Money after a yearUS dollars | $11,181.87 | $3,887.43 |
Bold green marks the better value on that metric. Where a source reports ranges that overlap, the difference may not be meaningful; see the benchmark page for ranges.