Model comparison
Claude 2 vs Grok 4 Fast
Grok 4 Fast is the stronger model overall, scoring 39.4 to 25.0 on the Noometry Index.
Last verified . 2 shared benchmarks.
Summary
- They share 2 benchmarks with published results for both. Claude 2 scores higher in 0 categories and Grok 4 Fast in 3 categories; 2 gaps are clear of the uncertainty.
- The widest gap is in math, where Grok 4 Fast leads 38.9 to 9.3.
- The biggest single-benchmark swing is DTBench: 51.9% for Claude 2 and 82.7% for Grok 4 Fast.
Side by side
| Claude 2 | Grok 4 Fast | |
|---|---|---|
| Provider | Anthropic | xAI |
| Noometry Index | 25.0 | 39.4 |
| Released | 2023-07-11 | 2025-09-19 |
| Weights | Proprietary | Proprietary |
| Context window | — | — |
| Max output | — | — |
| Input $ / M tokens | — | — |
| Output $ / M tokens | — | — |
| Results tracked | 8 | 30 |
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Category by category
Coding Not comparable
Claude 2: —, Grok 4 Fast: 32.5 (#271)
| Benchmark | Claude 2 | Grok 4 Fast |
|---|---|---|
| LMArena WebDev | — | 1159 |
| WeirdML | — | 42.9% |
| LMArena Coding | — | 1429 |
| HumanEval+ | 61.6% | — |
Agentic & Tool Use Not comparable
Claude 2: —, Grok 4 Fast: 29.5 (#86)
| Benchmark | Claude 2 | Grok 4 Fast |
|---|---|---|
| τ²-bench Banking | — | 15.7% |
| Cybench | — | 30% |
| LMArena Search | — | 1171 |
Reasoning Too close to call
Claude 2: 21.7 (#216), Grok 4 Fast: 22.2 (#201)
| Benchmark | Claude 2 | Grok 4 Fast |
|---|---|---|
| DTBench | 51.9% | 82.7% |
| Epoch Capabilities Index | 120.13 | 144.2 |
| ARC-AGI-2 | — | 5.3% |
| Kagi LLM Benchmark | — | 66.1% |
| ARC-AGI-1 | — | 48.5% |
| LMArena Hard Prompts | — | 1412 |
| ForecastBench | — | 60.5 |
Math Grok 4 Fast leads
Claude 2: 9.3 (#320), Grok 4 Fast: 38.9 (#123)
| Benchmark | Claude 2 | Grok 4 Fast |
|---|---|---|
| OTIS Mock AIME 2024-2025 | 2.5% | — |
| LMArena Math | — | 1419 |
| MATH Level 5 | 11.7% | — |
Knowledge Grok 4 Fast leads
Claude 2: 16.9 (#287), Grok 4 Fast: 32.0 (#214)
| Benchmark | Claude 2 | Grok 4 Fast |
|---|---|---|
| GPQA Diamond | 34.7% | — |
| Vectara Hallucination Rate | — | 19.7% |
| LMArena Expert | — | 1411 |
| MMLU | 78.5% | — |
| TriviaQA | 87.5% | — |
Multilingual Not comparable
Claude 2: —, Grok 4 Fast: 51.3 (#111)
| Benchmark | Claude 2 | Grok 4 Fast |
|---|---|---|
| LMArena Non-English | — | 1396 |
| LMArena Chinese | — | 1457 |
| LMArena French | — | 1431 |
| LMArena German | — | 1383 |
| LMArena Japanese | — | 1352 |
| LMArena Korean | — | 1357 |
| LMArena Russian | — | 1389 |
| LMArena Spanish | — | 1415 |
Instruction Following Not comparable
Claude 2: —, Grok 4 Fast: 73.2 (#121)
| Benchmark | Claude 2 | Grok 4 Fast |
|---|---|---|
| LMArena Instruction Following | — | 1387 |
Long Context Not comparable
Claude 2: —, Grok 4 Fast: 63.2 (#3)
| Benchmark | Claude 2 | Grok 4 Fast |
|---|---|---|
| Fiction.LiveBench | — | 94.4% |
| LMArena Longer Query | — | 1415 |
Writing & Preference Not comparable
Claude 2: —, Grok 4 Fast: 60.0 (#102)
| Benchmark | Claude 2 | Grok 4 Fast |
|---|---|---|
| LMArena Text | — | 1407 |
| LMArena Creative Writing | — | 1387 |
| LMArena Multi-Turn | — | 1414 |
Frequently asked questions
Is Claude 2 better than Grok 4 Fast?
Grok 4 Fast is the stronger model overall, scoring 39.4 to 25.0 on the Noometry Index.
How many benchmarks do Claude 2 and Grok 4 Fast share?
2 benchmarks have published results for both models. Claude 2 has 8 scored results on Noometry and Grok 4 Fast has 30.