Model comparison
Grok 4 Fast vs Olmo 2 0325 32b Instruct
Grok 4 Fast is the stronger model overall, scoring 39.4 to 32.7 on the Noometry Index.
Last verified . 11 shared benchmarks.
Allen Institute for AI (Ai2)Summary
- They share 11 benchmarks with published results for both. Grok 4 Fast scores higher in 6 categories and Olmo 2 0325 32b Instruct in 2 categories; 8 gaps are clear of the uncertainty.
- The widest gap is in long context, where Grok 4 Fast leads 63.2 to 36.2.
- Olmo 2 0325 32b Instruct has downloadable open weights; the other is API-only.
Side by side
| Grok 4 Fast | Olmo 2 0325 32b Instruct | |
|---|---|---|
| Provider | xAI | Allen Institute for AI (Ai2) |
| Noometry Index | 39.4 | 32.7 |
| Released | 2025-09-19 | — |
| Weights | Proprietary | Open |
| Context window | — | — |
| Max output | — | — |
| Input $ / M tokens | — | — |
| Output $ / M tokens | — | — |
| Results tracked | 30 | 16 |
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Category by category
Coding Olmo 2 0325 32b Instruct leads
Grok 4 Fast: 32.5 (#271), Olmo 2 0325 32b Instruct: 35.2 (#227)
| Benchmark | Grok 4 Fast | Olmo 2 0325 32b Instruct |
|---|---|---|
| LMArena Coding | 1429 | 1210 |
| LMArena WebDev | 1159 | — |
| WeirdML | 42.9% | — |
Agentic & Tool Use Not comparable
Grok 4 Fast: 29.5 (#86), Olmo 2 0325 32b Instruct: —
| Benchmark | Grok 4 Fast | Olmo 2 0325 32b Instruct |
|---|---|---|
| τ²-bench Banking | 15.7% | — |
| Cybench | 30% | — |
| LMArena Search | 1171 | — |
Reasoning Olmo 2 0325 32b Instruct leads
Grok 4 Fast: 22.2 (#201), Olmo 2 0325 32b Instruct: 23.6 (#175)
| Benchmark | Grok 4 Fast | Olmo 2 0325 32b Instruct |
|---|---|---|
| LMArena Hard Prompts | 1412 | 1208 |
| ARC-AGI-2 | 5.3% | — |
| Kagi LLM Benchmark | 66.1% | — |
| ARC-AGI-1 | 48.5% | — |
| DTBench | 82.7% | — |
| Epoch Capabilities Index | 144.2 | — |
| ForecastBench | 60.5 | — |
Math Grok 4 Fast leads
Grok 4 Fast: 38.9 (#123), Olmo 2 0325 32b Instruct: 26.8 (#255)
| Benchmark | Grok 4 Fast | Olmo 2 0325 32b Instruct |
|---|---|---|
| LMArena Math | 1419 | 1208 |
| Omni-MATH | — | 16.1% |
Knowledge Grok 4 Fast leads
Grok 4 Fast: 32.0 (#214), Olmo 2 0325 32b Instruct: 19.5 (#279)
| Benchmark | Grok 4 Fast | Olmo 2 0325 32b Instruct |
|---|---|---|
| MMLU-Pro | — | 41.4% |
| Vectara Hallucination Rate | 19.7% | — |
| GPQA (HELM) | — | 28.7% |
| LMArena Expert | 1411 | — |
Multilingual Grok 4 Fast leads
Grok 4 Fast: 51.3 (#111), Olmo 2 0325 32b Instruct: 34.8 (#248)
| Benchmark | Grok 4 Fast | Olmo 2 0325 32b Instruct |
|---|---|---|
| LMArena Non-English | 1396 | 1160 |
| LMArena Chinese | 1457 | 1192 |
| LMArena Russian | 1389 | 1187 |
| LMArena French | 1431 | — |
| LMArena German | 1383 | — |
| LMArena Japanese | 1352 | — |
| LMArena Korean | 1357 | — |
| LMArena Spanish | 1415 | — |
Instruction Following Grok 4 Fast leads
Grok 4 Fast: 73.2 (#121), Olmo 2 0325 32b Instruct: 61.5 (#244)
| Benchmark | Grok 4 Fast | Olmo 2 0325 32b Instruct |
|---|---|---|
| LMArena Instruction Following | 1387 | 1186 |
| IFEval | — | 78% |
Long Context Grok 4 Fast leads
Grok 4 Fast: 63.2 (#3), Olmo 2 0325 32b Instruct: 36.2 (#234)
| Benchmark | Grok 4 Fast | Olmo 2 0325 32b Instruct |
|---|---|---|
| LMArena Longer Query | 1415 | 1194 |
| Fiction.LiveBench | 94.4% | — |
Writing & Preference Grok 4 Fast leads
Grok 4 Fast: 60.0 (#102), Olmo 2 0325 32b Instruct: 42.1 (#236)
| Benchmark | Grok 4 Fast | Olmo 2 0325 32b Instruct |
|---|---|---|
| LMArena Text | 1407 | 1218 |
| LMArena Creative Writing | 1387 | 1199 |
| LMArena Multi-Turn | 1414 | 1221 |
| WildBench | — | 73.4% |
Frequently asked questions
Is Grok 4 Fast better than Olmo 2 0325 32b Instruct?
Grok 4 Fast is the stronger model overall, scoring 39.4 to 32.7 on the Noometry Index.
Is Grok 4 Fast or Olmo 2 0325 32b Instruct better for coding?
Olmo 2 0325 32b Instruct scores higher on coding benchmarks: 35.2 versus 32.5 in the Noometry coding category.
How many benchmarks do Grok 4 Fast and Olmo 2 0325 32b Instruct share?
11 benchmarks have published results for both models. Grok 4 Fast has 30 scored results on Noometry and Olmo 2 0325 32b Instruct has 16.