Model comparison
Grok 4 Fast vs Olmo 3.1 32b Think
Grok 4 Fast is the stronger model overall, scoring 39.0 to 37.3 on the Noometry Index.
Last verified . 15 shared benchmarks.
Allen Institute for AI (Ai2)Summary
- They share 15 benchmarks with published results for both. Grok 4 Fast scores higher in 5 categories and Olmo 3.1 32b Think in 3 categories; 8 gaps are clear of the uncertainty.
- The widest gap is in long context, where Grok 4 Fast leads 63.2 to 38.6.
- Olmo 3.1 32b Think has downloadable open weights; the other is API-only.
Side by side
| Grok 4 Fast | Olmo 3.1 32b Think | |
|---|---|---|
| Provider | xAI | Allen Institute for AI (Ai2) |
| Noometry Index | 39.0 | 37.3 |
| Released | 2025-09-19 | — |
| Weights | Proprietary | Open |
| Context window | — | — |
| Max output | — | — |
| Input $ / M tokens | — | — |
| Output $ / M tokens | — | — |
| Results tracked | 30 | 15 |
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Category by category
Coding Olmo 3.1 32b Think leads
Grok 4 Fast: 32.3 (#264), Olmo 3.1 32b Think: 37.1 (#186)
| Benchmark | Grok 4 Fast | Olmo 3.1 32b Think |
|---|---|---|
| LMArena Coding | 1429 | 1292 |
| LMArena WebDev | 1160 | — |
| WeirdML | 42.9% | — |
Agentic & Tool Use Not comparable
Grok 4 Fast: 29.3 (#80), Olmo 3.1 32b Think: —
| Benchmark | Grok 4 Fast | Olmo 3.1 32b Think |
|---|---|---|
| τ²-bench Banking | 15.7% | — |
| Cybench | 30% | — |
| LMArena Search | 1171 | — |
Reasoning Olmo 3.1 32b Think leads
Grok 4 Fast: 22.5 (#179), Olmo 3.1 32b Think: 24.1 (#151)
| Benchmark | Grok 4 Fast | Olmo 3.1 32b Think |
|---|---|---|
| LMArena Hard Prompts | 1413 | 1272 |
| ARC-AGI-2 | 5.3% | — |
| Kagi LLM Benchmark | 66.1% | — |
| ARC-AGI-1 | 48.5% | — |
| DTBench | 82.7% | — |
| Epoch Capabilities Index | 144.21 | — |
| ForecastBench | 60.5 | — |
Math Grok 4 Fast leads
Grok 4 Fast: 36.1 (#126), Olmo 3.1 32b Think: 33.6 (#170)
| Benchmark | Grok 4 Fast | Olmo 3.1 32b Think |
|---|---|---|
| LMArena Math | 1419 | 1305 |
Knowledge Olmo 3.1 32b Think leads
Grok 4 Fast: 31.5 (#211), Olmo 3.1 32b Think: 35.0 (#178)
| Benchmark | Grok 4 Fast | Olmo 3.1 32b Think |
|---|---|---|
| LMArena Expert | 1411 | 1294 |
| Vectara Hallucination Rate | 19.7% | — |
Multilingual Grok 4 Fast leads
Grok 4 Fast: 51.5 (#106), Olmo 3.1 32b Think: 38.3 (#226)
| Benchmark | Grok 4 Fast | Olmo 3.1 32b Think |
|---|---|---|
| LMArena Non-English | 1397 | 1210 |
| LMArena Chinese | 1458 | 1241 |
| LMArena French | 1433 | 1262 |
| LMArena German | 1383 | 1260 |
| LMArena Russian | 1387 | 1193 |
| LMArena Spanish | 1414 | 1288 |
| LMArena Japanese | 1358 | — |
| LMArena Korean | 1359 | — |
Instruction Following Grok 4 Fast leads
Grok 4 Fast: 73.4 (#116), Olmo 3.1 32b Think: 65.8 (#213)
| Benchmark | Grok 4 Fast | Olmo 3.1 32b Think |
|---|---|---|
| LMArena Instruction Following | 1388 | 1246 |
Long Context Grok 4 Fast leads
Grok 4 Fast: 63.2 (#3), Olmo 3.1 32b Think: 38.6 (#190)
| Benchmark | Grok 4 Fast | Olmo 3.1 32b Think |
|---|---|---|
| LMArena Longer Query | 1415 | 1272 |
| Fiction.LiveBench | 94.4% | — |
Writing & Preference Grok 4 Fast leads
Grok 4 Fast: 60.2 (#96), Olmo 3.1 32b Think: 46.4 (#215)
| Benchmark | Grok 4 Fast | Olmo 3.1 32b Think |
|---|---|---|
| LMArena Text | 1407 | 1271 |
| LMArena Creative Writing | 1388 | 1226 |
| LMArena Multi-Turn | 1414 | 1252 |
Frequently asked questions
Is Grok 4 Fast better than Olmo 3.1 32b Think?
Grok 4 Fast is the stronger model overall, scoring 39.0 to 37.3 on the Noometry Index.
Is Grok 4 Fast or Olmo 3.1 32b Think better for coding?
Olmo 3.1 32b Think scores higher on coding benchmarks: 37.1 versus 32.3 in the Noometry coding category.
How many benchmarks do Grok 4 Fast and Olmo 3.1 32b Think share?
15 benchmarks have published results for both models. Grok 4 Fast has 30 scored results on Noometry and Olmo 3.1 32b Think has 15.