Model comparison
Claude 3 Sonnet vs Grok 4 Fast
Grok 4 Fast is the stronger model overall, scoring 39.4 to 29.0 on the Noometry Index.
Last verified . 20 shared benchmarks.
Summary
- They share 20 benchmarks with published results for both. Claude 3 Sonnet scores higher in 0 categories and Grok 4 Fast in 8 categories; 8 gaps are clear of the uncertainty.
- The widest gap is in math, where Grok 4 Fast leads 38.9 to 10.7.
- The biggest single-benchmark swing is WeirdML: 10.2% for Claude 3 Sonnet and 42.9% for Grok 4 Fast.
Side by side
| Claude 3 Sonnet | Grok 4 Fast | |
|---|---|---|
| Provider | Anthropic | xAI |
| Noometry Index | 29.0 | 39.4 |
| Released | 2024-02-29 | 2025-09-19 |
| Weights | Proprietary | Proprietary |
| Context window | — | — |
| Max output | — | — |
| Input $ / M tokens | — | — |
| Output $ / M tokens | — | — |
| Results tracked | 30 | 30 |
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Category by category
Coding Grok 4 Fast leads
Claude 3 Sonnet: 29.6 (#302), Grok 4 Fast: 32.5 (#271)
| Benchmark | Claude 3 Sonnet | Grok 4 Fast |
|---|---|---|
| WeirdML | 10.2% | 42.9% |
| LMArena Coding | 1223 | 1429 |
| LMArena WebDev | — | 1159 |
| BigCodeBench Instruct | 42.7% | — |
| BigCodeBench Complete | 53.8% | — |
| HumanEval+ | 64% | — |
| MBPP+ | 69.3% | — |
Agentic & Tool Use Not comparable
Claude 3 Sonnet: —, Grok 4 Fast: 29.5 (#86)
| Benchmark | Claude 3 Sonnet | Grok 4 Fast |
|---|---|---|
| τ²-bench Banking | — | 15.7% |
| Cybench | — | 30% |
| LMArena Search | — | 1171 |
Reasoning Grok 4 Fast leads
Claude 3 Sonnet: 20.5 (#237), Grok 4 Fast: 22.2 (#201)
| Benchmark | Claude 3 Sonnet | Grok 4 Fast |
|---|---|---|
| LMArena Hard Prompts | 1197 | 1412 |
| DTBench | 53.6% | 82.7% |
| Epoch Capabilities Index | 120.7 | 144.2 |
| ARC-AGI-2 | — | 5.3% |
| Kagi LLM Benchmark | — | 66.1% |
| ARC-AGI-1 | — | 48.5% |
| ForecastBench | — | 60.5 |
| WinoGrande | 75.1% | — |
Math Grok 4 Fast leads
Claude 3 Sonnet: 10.7 (#310), Grok 4 Fast: 38.9 (#123)
| Benchmark | Claude 3 Sonnet | Grok 4 Fast |
|---|---|---|
| LMArena Math | 1213 | 1419 |
| OTIS Mock AIME 2024-2025 | 2.5% | — |
| MATH Level 5 | 18.2% | — |
Knowledge Grok 4 Fast leads
Claude 3 Sonnet: 21.1 (#276), Grok 4 Fast: 32.0 (#214)
| Benchmark | Claude 3 Sonnet | Grok 4 Fast |
|---|---|---|
| LMArena Expert | 1173 | 1411 |
| GPQA Diamond | 40.6% | — |
| Vectara Hallucination Rate | — | 19.7% |
| MMLU | 75.9% | — |
Multimodal Not comparable
Claude 3 Sonnet: 25.2 (#125), Grok 4 Fast: —
| Benchmark | Claude 3 Sonnet | Grok 4 Fast |
|---|---|---|
| LMArena Vision | 984 | — |
Multilingual Grok 4 Fast leads
Claude 3 Sonnet: 37.8 (#234), Grok 4 Fast: 51.3 (#111)
| Benchmark | Claude 3 Sonnet | Grok 4 Fast |
|---|---|---|
| LMArena Non-English | 1205 | 1396 |
| LMArena Chinese | 1189 | 1457 |
| LMArena French | 1229 | 1431 |
| LMArena German | 1204 | 1383 |
| LMArena Japanese | 1131 | 1352 |
| LMArena Korean | 1128 | 1357 |
| LMArena Russian | 1227 | 1389 |
| LMArena Spanish | 1204 | 1415 |
Instruction Following Grok 4 Fast leads
Claude 3 Sonnet: 62.8 (#235), Grok 4 Fast: 73.2 (#121)
| Benchmark | Claude 3 Sonnet | Grok 4 Fast |
|---|---|---|
| LMArena Instruction Following | 1199 | 1387 |
Long Context Grok 4 Fast leads
Claude 3 Sonnet: 36.7 (#228), Grok 4 Fast: 63.2 (#3)
| Benchmark | Claude 3 Sonnet | Grok 4 Fast |
|---|---|---|
| LMArena Longer Query | 1211 | 1415 |
| Fiction.LiveBench | — | 94.4% |
Writing & Preference Grok 4 Fast leads
Claude 3 Sonnet: 42.1 (#238), Grok 4 Fast: 60.0 (#102)
| Benchmark | Claude 3 Sonnet | Grok 4 Fast |
|---|---|---|
| LMArena Text | 1218 | 1407 |
| LMArena Creative Writing | 1186 | 1387 |
| LMArena Multi-Turn | 1227 | 1414 |
Frequently asked questions
Is Claude 3 Sonnet better than Grok 4 Fast?
Grok 4 Fast is the stronger model overall, scoring 39.4 to 29.0 on the Noometry Index.
Is Claude 3 Sonnet or Grok 4 Fast better for coding?
Grok 4 Fast scores higher on coding benchmarks: 32.5 versus 29.6 in the Noometry coding category.
How many benchmarks do Claude 3 Sonnet and Grok 4 Fast share?
20 benchmarks have published results for both models. Claude 3 Sonnet has 30 scored results on Noometry and Grok 4 Fast has 30.