Model comparison
Command R vs Grok 4 Fast
Grok 4 Fast is the stronger model overall, scoring 39.4 to 31.4 on the Noometry Index.
Last verified . 18 shared benchmarks.
CohereSummary
- They share 18 benchmarks with published results for both. Command R scores higher in 0 categories and Grok 4 Fast in 8 categories; 8 gaps are clear of the uncertainty.
- The widest gap is in long context, where Grok 4 Fast leads 63.2 to 36.3.
- The biggest single-benchmark swing is DTBench: 46.4% for Command R and 82.7% for Grok 4 Fast.
- Command R has downloadable open weights; the other is API-only.
Side by side
| Command R | Grok 4 Fast | |
|---|---|---|
| Provider | Cohere | xAI |
| Noometry Index | 31.4 | 39.4 |
| Released | 2024-08-30 | 2025-09-19 |
| Weights | Open | Proprietary |
| Context window | 128K | — |
| Max output | 4K | — |
| Input $ / M tokens | $0.15 | — |
| Output $ / M tokens | $0.60 | — |
| Results tracked | 29 | 30 |
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Category by category
Coding Grok 4 Fast leads
Command R: 29.3 (#306), Grok 4 Fast: 32.5 (#271)
| Benchmark | Command R | Grok 4 Fast |
|---|---|---|
| LMArena Coding | 1169 | 1429 |
| LMArena WebDev | — | 1159 |
| WeirdML | — | 42.9% |
| BigCodeBench Instruct | 37.1% | — |
| LiveBench Coding | 17.9% | — |
| BigCodeBench Complete | 45.2% | — |
Agentic & Tool Use Not comparable
Command R: —, Grok 4 Fast: 29.5 (#86)
| Benchmark | Command R | Grok 4 Fast |
|---|---|---|
| τ²-bench Banking | — | 15.7% |
| Cybench | — | 30% |
| LMArena Search | — | 1171 |
Reasoning Grok 4 Fast leads
Command R: 13.8 (#331), Grok 4 Fast: 22.2 (#201)
| Benchmark | Command R | Grok 4 Fast |
|---|---|---|
| LMArena Hard Prompts | 1164 | 1412 |
| DTBench | 46.4% | 82.7% |
| ARC-AGI-2 | — | 5.3% |
| Kagi LLM Benchmark | — | 66.1% |
| ARC-AGI-1 | — | 48.5% |
| LiveBench Reasoning | 21.9% | — |
| LiveBench Data Analysis | 33.3% | — |
| LMCA | 9.2% | — |
| Epoch Capabilities Index | — | 144.2 |
| ForecastBench | — | 60.5 |
| LiveBench | 27.5% | — |
Math Grok 4 Fast leads
Command R: 28.0 (#246), Grok 4 Fast: 38.9 (#123)
| Benchmark | Command R | Grok 4 Fast |
|---|---|---|
| LMArena Math | 1155 | 1419 |
| LiveBench Math | 19.4% | — |
Knowledge Grok 4 Fast leads
Command R: 31.0 (#221), Grok 4 Fast: 32.0 (#214)
| Benchmark | Command R | Grok 4 Fast |
|---|---|---|
| LMArena Expert | 1138 | 1411 |
| Vectara Hallucination Rate | — | 19.7% |
| MMLU | 65.2% | — |
Multilingual Grok 4 Fast leads
Command R: 35.7 (#245), Grok 4 Fast: 51.3 (#111)
| Benchmark | Command R | Grok 4 Fast |
|---|---|---|
| LMArena Non-English | 1174 | 1396 |
| LMArena Chinese | 1182 | 1457 |
| LMArena French | 1162 | 1431 |
| LMArena German | 1176 | 1383 |
| LMArena Japanese | 1143 | 1352 |
| LMArena Korean | 1163 | 1357 |
| LMArena Russian | 1174 | 1389 |
| LMArena Spanish | 1151 | 1415 |
Instruction Following Grok 4 Fast leads
Command R: 58.1 (#261), Grok 4 Fast: 73.2 (#121)
| Benchmark | Command R | Grok 4 Fast |
|---|---|---|
| LMArena Instruction Following | 1167 | 1387 |
| LiveBench Instruction Following | 55.6% | — |
Long Context Grok 4 Fast leads
Command R: 36.3 (#231), Grok 4 Fast: 63.2 (#3)
| Benchmark | Command R | Grok 4 Fast |
|---|---|---|
| LMArena Longer Query | 1198 | 1415 |
| Fiction.LiveBench | — | 94.4% |
Writing & Preference Grok 4 Fast leads
Command R: 38.2 (#254), Grok 4 Fast: 60.0 (#102)
| Benchmark | Command R | Grok 4 Fast |
|---|---|---|
| LMArena Text | 1187 | 1407 |
| LMArena Creative Writing | 1170 | 1387 |
| LMArena Multi-Turn | 1163 | 1414 |
| LiveBench Language | 16.7% | — |
Frequently asked questions
Is Command R better than Grok 4 Fast?
Grok 4 Fast is the stronger model overall, scoring 39.4 to 31.4 on the Noometry Index.
Is Command R or Grok 4 Fast better for coding?
Grok 4 Fast scores higher on coding benchmarks: 32.5 versus 29.3 in the Noometry coding category.
How many benchmarks do Command R and Grok 4 Fast share?
18 benchmarks have published results for both models. Command R has 29 scored results on Noometry and Grok 4 Fast has 30.