Model comparison
Claude Opus 4.5 vs Grok 4.5
Grok 4.5 is the stronger model overall, scoring 55.0 to 50.5 on the Noometry Index.
Last verified . 41 shared benchmarks.
Summary
- They share 41 benchmarks with published results for both. Claude Opus 4.5 scores higher in 5 categories and Grok 4.5 in 5 categories; 9 gaps are clear of the uncertainty.
- The widest gap is in math, where Grok 4.5 leads 60.9 to 38.6.
- The biggest single-benchmark swing is NYT Connections (extended): 52.5% for Claude Opus 4.5 and 79.9% for Grok 4.5.
- Grok 4.5 is cheaper at $2 / $6 per million input/output tokens, against $5 / $25 for Claude Opus 4.5.
- Grok 4.5 accepts more context: 500K tokens versus 200K.
Side by side
| Claude Opus 4.5 | Grok 4.5 | |
|---|---|---|
| Provider | Anthropic | xAI |
| Noometry Index | 50.5 | 55.0 |
| Released | 2025-11-01 | 2026-07-08 |
| Weights | Proprietary | Proprietary |
| Context window | 200K | 500K |
| Max output | 64K | 500K |
| Input $ / M tokens | $5 | $2 |
| Output $ / M tokens | $25 | $6 |
| Results tracked | 69 | 52 |
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Category by category
Coding Claude Opus 4.5 leads
Claude Opus 4.5: 54.8 (#27), Grok 4.5: 52.2 (#35)
| Benchmark | Claude Opus 4.5 | Grok 4.5 |
|---|---|---|
| LMArena WebDev | 1494 | 1553 |
| WeirdML | 63.7% | 46.4% |
| LMArena Coding | 1504 | 1474 |
| ALE-Bench | 1,025 | 1,309 |
| SWE-bench Verified | 76.7% | — |
| DeepSWE | — | 53.8% |
| FrontierCode | — | 42.4% |
| SWE-bench Verified (bash only) | 76.8% | — |
| SWE-bench Multilingual | 70.7% | — |
| SciCode | — | 54.1% |
| GSO | 26.5% | — |
| AlgoTune | 1.77 | — |
Agentic & Tool Use Claude Opus 4.5 leads
Claude Opus 4.5: 47.3 (#12), Grok 4.5: 44.4 (#17)
| Benchmark | Claude Opus 4.5 | Grok 4.5 |
|---|---|---|
| τ²-bench Banking | 24.7% | 47.9% |
| LMArena Search | 1180 | 1213 |
| Vending-Bench 2 | 4,967 | 3,887 |
| Terminal-Bench | 63.1% | — |
| APEX-Agents | — | 56.2% |
| Berkeley Function Calling Leaderboard | 77.5% | — |
| GDPval | 45.5% | — |
| Remote Labor Index | 3.8% | — |
| τ²-bench Airline | 84% | — |
| τ²-bench Retail | 79.6% | — |
| τ²-bench Telecom | 92.3% | — |
| Cybench | 82% | — |
| DeepResearch Bench | 54.8% | — |
| OSWorld | 66.3% | — |
| PostTrainBench | — | 23.4% |
| BALROG | 43.5% | — |
| GBAEval | — | 65.4% |
| GDP.pdf | — | 14% |
| METR Time Horizons | 75% | — |
Reasoning Grok 4.5 leads
Claude Opus 4.5: 42.6 (#51), Grok 4.5: 56.1 (#25)
| Benchmark | Claude Opus 4.5 | Grok 4.5 |
|---|---|---|
| ARC-AGI-2 | 37.6% | 52.6% |
| SimpleBench | 62% | 70% |
| Kagi LLM Benchmark | 80.2% | 83.5% |
| NYT Connections (extended) | 52.5% | 79.9% |
| ARC-AGI-1 | 80% | 87.2% |
| Chess Puzzles | 12% | 36% |
| LMArena Hard Prompts | 1476 | 1462 |
| DTBench | 89.9% | 96.5% |
| LMCA | 44.5% | 45.2% |
| Epoch Capabilities Index | 150.09 | 153.92 |
| CritPt | — | 15.4% |
| EnigmaEval | 11.9% | — |
| EBR-Bench | 14.3% | — |
| Mystery Game Puzzles | 22% | — |
| Surface Evolver Bench | — | 74.4% |
| ForecastBench | 60.7 | — |
Math Grok 4.5 leads
Claude Opus 4.5: 38.6 (#132), Grok 4.5: 60.9 (#35)
| Benchmark | Claude Opus 4.5 | Grok 4.5 |
|---|---|---|
| FrontierMath (Tiers 1-3) | 34.4% | 57.2% |
| FrontierMath Tier 4 | 4.9% | 24.4% |
| OTIS Mock AIME 2024-2025 | 86.1% | 97.8% |
| ProofBench | 36% | 31% |
| LMArena Math | 1463 | 1459 |
| FrontierMath (Feb 2025 set) | 20.7% | — |
| FrontierMath Tier 4 (v1) | 4.2% | — |
Knowledge Grok 4.5 leads
Claude Opus 4.5: 56.5 (#44), Grok 4.5: 62.3 (#24)
| Benchmark | Claude Opus 4.5 | Grok 4.5 |
|---|---|---|
| GPQA Diamond | 86% | 93.4% |
| SimpleQA Verified | 45.7% | 48.3% |
| LMArena Expert | 1487 | 1466 |
| Humanity's Last Exam | 25.2% | — |
| Vectara Hallucination Rate | 10.9% | — |
Multimodal Grok 4.5 leads
Claude Opus 4.5: 31.4 (#107), Grok 4.5: 37.6 (#72)
| Benchmark | Claude Opus 4.5 | Grok 4.5 |
|---|---|---|
| Furniture Assembly | 28.3% | 22.5% |
| LMArena Document | 1462 | 1452 |
| LMArena Vision | — | 1288 |
| GeoBench | 75% | — |
| VPCT | 40% | — |
| Blueprint-Bench 2 | — | 27.3% |
Multilingual Too close to call
Claude Opus 4.5: 54.3 (#47), Grok 4.5: 54.4 (#42)
| Benchmark | Claude Opus 4.5 | Grok 4.5 |
|---|---|---|
| LMArena Non-English | 1438 | 1440 |
| LMArena Chinese | 1470 | 1496 |
| LMArena French | 1471 | 1456 |
| LMArena German | 1449 | 1446 |
| LMArena Japanese | 1416 | 1428 |
| LMArena Korean | 1424 | 1404 |
| LMArena Russian | 1447 | 1448 |
| LMArena Spanish | 1458 | 1450 |
Instruction Following Claude Opus 4.5 leads
Claude Opus 4.5: 77.5 (#19), Grok 4.5: 76.0 (#48)
| Benchmark | Claude Opus 4.5 | Grok 4.5 |
|---|---|---|
| LMArena Instruction Following | 1478 | 1446 |
Long Context Claude Opus 4.5 leads
Claude Opus 4.5: 46.5 (#22), Grok 4.5: 44.8 (#56)
| Benchmark | Claude Opus 4.5 | Grok 4.5 |
|---|---|---|
| LMArena Longer Query | 1480 | 1463 |
| CL-bench | 21.1% | — |
Writing & Preference Claude Opus 4.5 leads
Claude Opus 4.5: 68.1 (#28), Grok 4.5: 65.8 (#42)
| Benchmark | Claude Opus 4.5 | Grok 4.5 |
|---|---|---|
| LMArena Text | 1451 | 1448 |
| LMArena Creative Writing | 1445 | 1442 |
| EQ-Bench Creative Writing | 1687 | 1579 |
| LMArena Multi-Turn | 1466 | 1456 |
Frequently asked questions
Is Claude Opus 4.5 better than Grok 4.5?
Grok 4.5 is the stronger model overall, scoring 55.0 to 50.5 on the Noometry Index.
Which is cheaper, Claude Opus 4.5 or Grok 4.5?
Grok 4.5 is cheaper. It lists at $2 per million input tokens and $6 per million output tokens; Claude Opus 4.5 lists at $5 and $25.
Is Claude Opus 4.5 or Grok 4.5 better for coding?
Claude Opus 4.5 scores higher on coding benchmarks: 54.8 versus 52.2 in the Noometry coding category.
Which has the bigger context window?
Grok 4.5 does, with 500K tokens against 200K.
How many benchmarks do Claude Opus 4.5 and Grok 4.5 share?
41 benchmarks have published results for both models. Claude Opus 4.5 has 69 scored results on Noometry and Grok 4.5 has 52.