Model comparison
Claude 3.5 Haiku vs Grok 4.1 Fast
Grok 4.1 Fast is the stronger model overall, scoring 41.4 to 29.2 on the Noometry Index.
Last verified . 20 shared benchmarks.
Summary
- They share 20 benchmarks with published results for both. Claude 3.5 Haiku 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 43.4 to 17.7.
- The biggest single-benchmark swing is DTBench: 56.7% for Claude 3.5 Haiku and 87.7% for Grok 4.1 Fast.
Side by side
| Claude 3.5 Haiku | Grok 4.1 Fast | |
|---|---|---|
| Provider | Anthropic | xAI |
| Noometry Index | 29.2 | 41.4 |
| Released | 2024-10-22 | 2025-06-27 |
| Weights | Proprietary | Proprietary |
| Context window | — | 128K |
| Max output | — | 30K |
| Input $ / M tokens | — | $0.20 |
| Output $ / M tokens | — | $0.50 |
| Results tracked | 49 | 32 |
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Category by category
Coding Grok 4.1 Fast leads
Claude 3.5 Haiku: 32.9 (#265), Grok 4.1 Fast: 34.1 (#245)
| Benchmark | Claude 3.5 Haiku | Grok 4.1 Fast |
|---|---|---|
| LMArena Coding | 1286 | 1411 |
| Aider Polyglot | 28% | — |
| LMArena WebDev | — | 1242 |
| SciCode | 27.4% | — |
| WeirdML | 30.7% | — |
| BigCodeBench Instruct | 46.1% | — |
| LiveBench Coding | 51.4% | — |
| BigCodeBench Complete | 59% | — |
| CadEval | 32% | — |
| ALE-Bench | — | 394.93 |
Agentic & Tool Use Grok 4.1 Fast leads
Claude 3.5 Haiku: 28.0 (#95), Grok 4.1 Fast: 36.3 (#39)
| Benchmark | Claude 3.5 Haiku | Grok 4.1 Fast |
|---|---|---|
| Berkeley Function Calling Leaderboard | — | 69.6% |
| τ²-bench Banking | — | 13.1% |
| BALROG | 19.3% | — |
| LMArena Search | — | 1171 |
| Vending-Bench 2 | — | 1,107 |
Reasoning Grok 4.1 Fast leads
Claude 3.5 Haiku: 17.7 (#290), Grok 4.1 Fast: 43.4 (#49)
| Benchmark | Claude 3.5 Haiku | Grok 4.1 Fast |
|---|---|---|
| LMArena Hard Prompts | 1251 | 1407 |
| DTBench | 56.7% | 87.7% |
| SimpleBench | — | 56% |
| NYT Connections (extended) | — | 87.4% |
| CritPt | 0% | — |
| LiveBench Reasoning | 28.1% | — |
| LiveBench Data Analysis | 48.5% | — |
| Epoch Capabilities Index | 127.15 | — |
| ForecastBench | — | 61 |
| LiveBench | 43.5% | — |
Math Grok 4.1 Fast leads
Claude 3.5 Haiku: 14.7 (#300), Grok 4.1 Fast: 31.9 (#221)
| Benchmark | Claude 3.5 Haiku | Grok 4.1 Fast |
|---|---|---|
| LMArena Math | 1244 | 1408 |
| MathArena Final-Answer Competitions | — | 60.9% |
| OTIS Mock AIME 2024-2025 | 4.3% | — |
| ProofBench | — | 4% |
| Omni-MATH | 22.4% | — |
| LiveBench Math | 35.5% | — |
| MATH Level 5 | 46.4% | — |
| FrontierMath (Feb 2025 set) | 0.3% | — |
Knowledge Grok 4.1 Fast leads
Claude 3.5 Haiku: 18.7 (#281), Grok 4.1 Fast: 33.1 (#207)
| Benchmark | Claude 3.5 Haiku | Grok 4.1 Fast |
|---|---|---|
| LMArena Expert | 1208 | 1399 |
| GPQA Diamond | 38.1% | — |
| MMLU-Pro | 60.5% | — |
| Confabulations | 36.7% | — |
| Vectara Hallucination Rate | — | 17.8% |
| GPQA (HELM) | 36.3% | — |
| MMLU | 74.3% | — |
Multimodal Grok 4.1 Fast leads
Claude 3.5 Haiku: 26.8 (#117), Grok 4.1 Fast: 37.0 (#76)
| Benchmark | Claude 3.5 Haiku | Grok 4.1 Fast |
|---|---|---|
| LMArena Vision | 1092 | 1201 |
| GeoBench | 34% | — |
Multilingual Grok 4.1 Fast leads
Claude 3.5 Haiku: 40.0 (#218), Grok 4.1 Fast: 51.0 (#114)
| Benchmark | Claude 3.5 Haiku | Grok 4.1 Fast |
|---|---|---|
| LMArena Non-English | 1238 | 1391 |
| LMArena Chinese | 1229 | 1441 |
| LMArena French | 1264 | 1415 |
| LMArena German | 1237 | 1404 |
| LMArena Japanese | 1175 | 1349 |
| LMArena Korean | 1173 | 1361 |
| LMArena Russian | 1253 | 1387 |
| LMArena Spanish | 1261 | 1413 |
Instruction Following Grok 4.1 Fast leads
Claude 3.5 Haiku: 62.9 (#234), Grok 4.1 Fast: 72.7 (#133)
| Benchmark | Claude 3.5 Haiku | Grok 4.1 Fast |
|---|---|---|
| LMArena Instruction Following | 1241 | 1376 |
| LiveBench Instruction Following | 61.9% | — |
| IFEval | 79.2% | — |
Long Context Grok 4.1 Fast leads
Claude 3.5 Haiku: 38.3 (#200), Grok 4.1 Fast: 42.4 (#126)
| Benchmark | Claude 3.5 Haiku | Grok 4.1 Fast |
|---|---|---|
| LMArena Longer Query | 1261 | 1390 |
Writing & Preference Grok 4.1 Fast leads
Claude 3.5 Haiku: 42.7 (#234), Grok 4.1 Fast: 57.2 (#131)
| Benchmark | Claude 3.5 Haiku | Grok 4.1 Fast |
|---|---|---|
| LMArena Text | 1255 | 1408 |
| LMArena Creative Writing | 1233 | 1394 |
| EQ-Bench Creative Writing | 1146 | 1327 |
| LMArena Multi-Turn | 1265 | 1389 |
| Short-Story Creative Writing | 73.5% | — |
| WildBench | 76% | — |
| LiveBench Language | 35.4% | — |
Frequently asked questions
Is Claude 3.5 Haiku better than Grok 4.1 Fast?
Grok 4.1 Fast is the stronger model overall, scoring 41.4 to 29.2 on the Noometry Index.
Is Claude 3.5 Haiku or Grok 4.1 Fast better for coding?
Grok 4.1 Fast scores higher on coding benchmarks: 34.1 versus 32.9 in the Noometry coding category.
How many benchmarks do Claude 3.5 Haiku and Grok 4.1 Fast share?
20 benchmarks have published results for both models. Claude 3.5 Haiku has 49 scored results on Noometry and Grok 4.1 Fast has 32.