Model comparison
Claude 3 Opus vs Grok 4.1 Fast
Grok 4.1 Fast is the stronger model overall, scoring 40.9 to 29.3 on the Noometry Index.
Last verified . 21 shared benchmarks.
Summary
- They share 21 benchmarks with published results for both. Claude 3 Opus scores higher in 0 categories and Grok 4.1 Fast in 10 categories; 10 gaps are clear of the uncertainty.
- The widest gap is in reasoning, where Grok 4.1 Fast leads 42.3 to 14.2.
- The biggest single-benchmark swing is SimpleBench: 23.5% for Claude 3 Opus and 56% for Grok 4.1 Fast.
Side by side
| Claude 3 Opus | Grok 4.1 Fast | |
|---|---|---|
| Provider | Anthropic | xAI |
| Noometry Index | 29.3 | 40.9 |
| Released | 2024-02-29 | 2025-06-27 |
| Weights | Proprietary | Proprietary |
| Context window | — | 128K |
| Max output | — | 30K |
| Input $ / M tokens | — | $0.20 |
| Output $ / M tokens | — | $0.50 |
| Results tracked | 46 | 32 |
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Category by category
Coding Grok 4.1 Fast leads
Claude 3 Opus: 32.4 (#261), Grok 4.1 Fast: 33.8 (#236)
| Benchmark | Claude 3 Opus | Grok 4.1 Fast |
|---|---|---|
| LMArena Coding | 1264 | 1411 |
| LMArena WebDev | — | 1241 |
| WeirdML | 19.2% | — |
| BigCodeBench Instruct | 45.5% | — |
| LiveBench Coding | 38.6% | — |
| BigCodeBench Complete | 57.4% | — |
| ALE-Bench | — | 394.93 |
| HumanEval+ | 77.4% | — |
| MBPP+ | 73.3% | — |
Agentic & Tool Use Grok 4.1 Fast leads
Claude 3 Opus: 24.3 (#110), Grok 4.1 Fast: 36.1 (#35)
| Benchmark | Claude 3 Opus | Grok 4.1 Fast |
|---|---|---|
| Berkeley Function Calling Leaderboard | — | 69.6% |
| τ²-bench Banking | — | 13.1% |
| Cybench | 10% | — |
| LMArena Search | — | 1171 |
| METR Time Horizons | 29.5% | — |
| Vending-Bench 2 | — | 1,107 |
Reasoning Grok 4.1 Fast leads
Claude 3 Opus: 14.2 (#318), Grok 4.1 Fast: 42.3 (#45)
| Benchmark | Claude 3 Opus | Grok 4.1 Fast |
|---|---|---|
| SimpleBench | 23.5% | 56% |
| LMArena Hard Prompts | 1246 | 1407 |
| DTBench | 61.6% | 87.7% |
| ForecastBench | 58.4 | 61 |
| NYT Connections (extended) | — | 87.4% |
| Chess Puzzles | 5% | — |
| EnigmaEval | 0.8% | — |
| LiveBench Reasoning | 40.6% | — |
| LiveBench Data Analysis | 57.9% | — |
| LMCA | 17% | — |
| Epoch Capabilities Index | 126.91 | — |
| LiveBench | 49.2% | — |
| WinoGrande | 88.5% | — |
Math Grok 4.1 Fast leads
Claude 3 Opus: 13.9 (#293), Grok 4.1 Fast: 30.9 (#201)
| Benchmark | Claude 3 Opus | Grok 4.1 Fast |
|---|---|---|
| LMArena Math | 1273 | 1408 |
| MathArena Final-Answer Competitions | — | 60.9% |
| OTIS Mock AIME 2024-2025 | 4.7% | — |
| ProofBench | — | 4% |
| LiveBench Math | 43.6% | — |
| MATH Level 5 | 37.5% | — |
Knowledge Grok 4.1 Fast leads
Claude 3 Opus: 24.5 (#262), Grok 4.1 Fast: 32.6 (#203)
| Benchmark | Claude 3 Opus | Grok 4.1 Fast |
|---|---|---|
| LMArena Expert | 1223 | 1398 |
| GPQA Diamond | 47.2% | — |
| SimpleQA Verified | 12.6% | — |
| Confabulations | 22.7% | — |
| Vectara Hallucination Rate | — | 17.8% |
| MMLU | 84.6% | — |
Multimodal Grok 4.1 Fast leads
Claude 3 Opus: 26.6 (#112), Grok 4.1 Fast: 36.3 (#71)
| Benchmark | Claude 3 Opus | Grok 4.1 Fast |
|---|---|---|
| LMArena Vision | 1023 | 1201 |
Multilingual Grok 4.1 Fast leads
Claude 3 Opus: 41.6 (#202), Grok 4.1 Fast: 51.1 (#110)
| Benchmark | Claude 3 Opus | Grok 4.1 Fast |
|---|---|---|
| LMArena Non-English | 1258 | 1391 |
| LMArena Chinese | 1248 | 1441 |
| LMArena French | 1274 | 1416 |
| LMArena German | 1258 | 1404 |
| LMArena Japanese | 1204 | 1347 |
| LMArena Korean | 1187 | 1361 |
| LMArena Russian | 1280 | 1387 |
| LMArena Spanish | 1246 | 1411 |
Instruction Following Grok 4.1 Fast leads
Claude 3 Opus: 64.3 (#223), Grok 4.1 Fast: 72.8 (#127)
| Benchmark | Claude 3 Opus | Grok 4.1 Fast |
|---|---|---|
| LMArena Instruction Following | 1248 | 1376 |
| LiveBench Instruction Following | 63.9% | — |
Long Context Grok 4.1 Fast leads
Claude 3 Opus: 38.2 (#197), Grok 4.1 Fast: 42.4 (#121)
| Benchmark | Claude 3 Opus | Grok 4.1 Fast |
|---|---|---|
| LMArena Longer Query | 1259 | 1390 |
Writing & Preference Grok 4.1 Fast leads
Claude 3 Opus: 47.4 (#208), Grok 4.1 Fast: 57.4 (#126)
| Benchmark | Claude 3 Opus | Grok 4.1 Fast |
|---|---|---|
| LMArena Text | 1262 | 1408 |
| LMArena Creative Writing | 1235 | 1394 |
| LMArena Multi-Turn | 1275 | 1389 |
| EQ-Bench Creative Writing | — | 1327 |
| LiveBench Language | 50.4% | — |
Frequently asked questions
Is Claude 3 Opus better than Grok 4.1 Fast?
Grok 4.1 Fast is the stronger model overall, scoring 40.9 to 29.3 on the Noometry Index.
Is Claude 3 Opus or Grok 4.1 Fast better for coding?
Grok 4.1 Fast scores higher on coding benchmarks: 33.8 versus 32.4 in the Noometry coding category.
How many benchmarks do Claude 3 Opus and Grok 4.1 Fast share?
21 benchmarks have published results for both models. Claude 3 Opus has 46 scored results on Noometry and Grok 4.1 Fast has 32.