Model comparison
Claude Opus 4 vs Grok 4.3
Claude Opus 4 and Grok 4.3 score almost the same on the Noometry Index (43.1 vs 43.8), so choose on price, context window or the category you care about most.
Last verified . 27 shared benchmarks.
Summary
- They share 27 benchmarks with published results for both. Claude Opus 4 scores higher in 4 categories and Grok 4.3 in 6 categories; 9 gaps are clear of the uncertainty.
- The widest gap is in reasoning, where Grok 4.3 leads 35.9 to 27.3.
- The biggest single-benchmark swing is OTIS Mock AIME 2024-2025: 64.4% for Claude Opus 4 and 93.3% for Grok 4.3.
- Grok 4.3 is cheaper at $1.25 / $2.50 per million input/output tokens, against $15 / $75 for Claude Opus 4.
- Grok 4.3 accepts more context: 1M tokens versus 200K.
Side by side
| Claude Opus 4 | Grok 4.3 | |
|---|---|---|
| Provider | Anthropic | xAI |
| Noometry Index | 43.1 | 43.8 |
| Released | 2025-05-22 | 2026-04-17 |
| Weights | Proprietary | Proprietary |
| Context window | 200K | 1M |
| Max output | 32K | 30K |
| Input $ / M tokens | $15 | $1.25 |
| Output $ / M tokens | $75 | $2.50 |
| Results tracked | 56 | 40 |
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Category by category
Coding Claude Opus 4 leads
Claude Opus 4: 47.2 (#62), Grok 4.3: 41.6 (#121)
| Benchmark | Claude Opus 4 | Grok 4.3 |
|---|---|---|
| WeirdML | 43.7% | 49.9% |
| LMArena Coding | 1442 | 1415 |
| SWE-bench Verified | 70.7% | — |
| SWE-bench Verified (bash only) | 67.6% | — |
| Aider Polyglot | 72% | — |
| LMArena WebDev | — | 1357 |
| SciCode | — | 47.3% |
| GSO | 6.9% | — |
| ALE-Bench | — | 944.17 |
| AlgoTune | 1.33 | — |
Agentic & Tool Use Claude Opus 4 leads
Claude Opus 4: 34.8 (#42), Grok 4.3: 27.7 (#99)
| Benchmark | Claude Opus 4 | Grok 4.3 |
|---|---|---|
| LMArena Search | 1127 | 1165 |
| Cybench | 38% | — |
| DeepResearch Bench | 46.8% | — |
| GDP.pdf | — | 8% |
| METR Time Horizons | 63.9% | — |
| Vending-Bench 2 | — | 35.26 |
Reasoning Grok 4.3 leads
Claude Opus 4: 27.3 (#121), Grok 4.3: 35.9 (#68)
| Benchmark | Claude Opus 4 | Grok 4.3 |
|---|---|---|
| CritPt | 0.3% | 8% |
| LMArena Hard Prompts | 1399 | 1396 |
| DTBench | 81.6% | 90.7% |
| LMCA | 37.4% | 38.3% |
| Epoch Capabilities Index | 142.67 | 149.16 |
| ForecastBench | 61.1 | 60.3 |
| ARC-AGI-2 | 8.6% | — |
| SimpleBench | 58.8% | — |
| Kagi LLM Benchmark | 74.3% | — |
| NYT Connections (extended) | — | 55.2% |
| ARC-AGI-1 | 35.7% | — |
| Chess Puzzles | — | 25% |
| EnigmaEval | 5.6% | — |
Math Grok 4.3 leads
Claude Opus 4: 42.0 (#86), Grok 4.3: 46.0 (#74)
| Benchmark | Claude Opus 4 | Grok 4.3 |
|---|---|---|
| OTIS Mock AIME 2024-2025 | 64.4% | 93.3% |
| LMArena Math | 1390 | 1388 |
| FrontierMath (Tiers 1-3) | — | 42.8% |
| FrontierMath Tier 4 | — | 14.6% |
| ProofBench | — | 11% |
| Omni-MATH | 61.6% | — |
| MATH Level 5 | 85% | — |
| FrontierMath (Feb 2025 set) | 4.5% | — |
| FrontierMath Tier 4 (v1) | 4.2% | — |
Knowledge Grok 4.3 leads
Claude Opus 4: 44.0 (#88), Grok 4.3: 52.5 (#62)
| Benchmark | Claude Opus 4 | Grok 4.3 |
|---|---|---|
| GPQA Diamond | 76.3% | 88.8% |
| LMArena Expert | 1386 | 1385 |
| Humanity's Last Exam | 10.7% | — |
| SimpleQA Verified | — | 33.2% |
| MMLU-Pro | 87.5% | — |
| Confabulations | 15.9% | — |
| Vectara Hallucination Rate | 12% | — |
| GPQA (HELM) | 70.8% | — |
Multimodal Too close to call
Claude Opus 4: 31.5 (#106), Grok 4.3: 31.6 (#104)
| Benchmark | Claude Opus 4 | Grok 4.3 |
|---|---|---|
| LMArena Vision | 1192 | 1229 |
| GeoBench | 49% | — |
| VPCT | 38% | — |
| Blueprint-Bench 2 | — | 0% |
Multilingual Grok 4.3 leads
Claude Opus 4: 48.8 (#138), Grok 4.3: 50.5 (#120)
| Benchmark | Claude Opus 4 | Grok 4.3 |
|---|---|---|
| LMArena Non-English | 1362 | 1385 |
| LMArena Chinese | 1386 | 1422 |
| LMArena French | 1372 | 1412 |
| LMArena German | 1391 | 1395 |
| LMArena Japanese | 1331 | 1379 |
| LMArena Korean | 1321 | 1356 |
| LMArena Russian | 1392 | 1399 |
| LMArena Spanish | 1389 | 1398 |
Instruction Following Claude Opus 4 leads
Claude Opus 4: 77.1 (#28), Grok 4.3: 72.1 (#140)
| Benchmark | Claude Opus 4 | Grok 4.3 |
|---|---|---|
| LMArena Instruction Following | 1406 | 1366 |
| IFEval | 91.8% | — |
Long Context Grok 4.3 leads
Claude Opus 4: 39.6 (#172), Grok 4.3: 42.5 (#123)
| Benchmark | Claude Opus 4 | Grok 4.3 |
|---|---|---|
| LMArena Longer Query | 1422 | 1393 |
| Fiction.LiveBench | 61.1% | — |
Writing & Preference Claude Opus 4 leads
Claude Opus 4: 61.2 (#89), Grok 4.3: 58.5 (#118)
| Benchmark | Claude Opus 4 | Grok 4.3 |
|---|---|---|
| LMArena Text | 1377 | 1397 |
| LMArena Creative Writing | 1387 | 1380 |
| LMArena Multi-Turn | 1396 | 1406 |
| Short-Story Creative Writing | 83.6% | — |
| EQ-Bench Creative Writing | 1580 | — |
| WildBench | 85.2% | — |
| EQ-Bench 4 | — | 1075 |
Frequently asked questions
Is Claude Opus 4 better than Grok 4.3?
Claude Opus 4 and Grok 4.3 score almost the same on the Noometry Index (43.1 vs 43.8), so choose on price, context window or the category you care about most.
Which is cheaper, Claude Opus 4 or Grok 4.3?
Grok 4.3 is cheaper. It lists at $1.25 per million input tokens and $2.50 per million output tokens; Claude Opus 4 lists at $15 and $75.
Is Claude Opus 4 or Grok 4.3 better for coding?
Claude Opus 4 scores higher on coding benchmarks: 47.2 versus 41.6 in the Noometry coding category.
Which has the bigger context window?
Grok 4.3 does, with 1M tokens against 200K.
How many benchmarks do Claude Opus 4 and Grok 4.3 share?
27 benchmarks have published results for both models. Claude Opus 4 has 56 scored results on Noometry and Grok 4.3 has 40.