Model comparison
Grok 4.20 Multi-Agent vs Grok 4 Fast
Grok 4.20 Multi-Agent is the stronger model overall, scoring 45.5 to 39.0 on the Noometry Index.
Last verified . 18 shared benchmarks.
Summary
- They share 18 benchmarks with published results for both. Grok 4.20 Multi-Agent scores higher in 7 categories and Grok 4 Fast in 1 category; 7 gaps are clear of the uncertainty.
- The widest gap is in reasoning, where Grok 4.20 Multi-Agent leads 42.4 to 22.5.
Side by side
| Grok 4.20 Multi-Agent | Grok 4 Fast | |
|---|---|---|
| Provider | xAI | xAI |
| Noometry Index | 45.5 | 39.0 |
| Released | 2026-03-09 | 2025-09-19 |
| Weights | Proprietary | Proprietary |
| Context window | 1M | — |
| Max output | 30K | — |
| Input $ / M tokens | $1.25 | — |
| Output $ / M tokens | $2.50 | — |
| Results tracked | 20 | 30 |
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Category by category
Coding Grok 4.20 Multi-Agent leads
Grok 4.20 Multi-Agent: 42.4 (#91), Grok 4 Fast: 32.3 (#264)
| Benchmark | Grok 4.20 Multi-Agent | Grok 4 Fast |
|---|---|---|
| LMArena Coding | 1458 | 1429 |
| LMArena WebDev | — | 1160 |
| WeirdML | — | 42.9% |
Agentic & Tool Use Not comparable
Grok 4.20 Multi-Agent: —, Grok 4 Fast: 29.3 (#80)
| Benchmark | Grok 4.20 Multi-Agent | Grok 4 Fast |
|---|---|---|
| LMArena Search | 1204 | 1171 |
| τ²-bench Banking | — | 15.7% |
| Cybench | — | 30% |
Reasoning Grok 4.20 Multi-Agent leads
Grok 4.20 Multi-Agent: 42.4 (#44), Grok 4 Fast: 22.5 (#179)
| Benchmark | Grok 4.20 Multi-Agent | Grok 4 Fast |
|---|---|---|
| LMArena Hard Prompts | 1448 | 1413 |
| ARC-AGI-2 | — | 5.3% |
| Kagi LLM Benchmark | — | 66.1% |
| NYT Connections (extended) | 89.6% | — |
| ARC-AGI-1 | — | 48.5% |
| DTBench | — | 82.7% |
| Epoch Capabilities Index | — | 144.21 |
| ForecastBench | — | 60.5 |
Math Too close to call
Grok 4.20 Multi-Agent: 36.6 (#106), Grok 4 Fast: 36.1 (#126)
| Benchmark | Grok 4.20 Multi-Agent | Grok 4 Fast |
|---|---|---|
| LMArena Math | 1441 | 1419 |
Knowledge Grok 4.20 Multi-Agent leads
Grok 4.20 Multi-Agent: 39.7 (#116), Grok 4 Fast: 31.5 (#211)
| Benchmark | Grok 4.20 Multi-Agent | Grok 4 Fast |
|---|---|---|
| LMArena Expert | 1445 | 1411 |
| Vectara Hallucination Rate | — | 19.7% |
Multimodal Not comparable
Grok 4.20 Multi-Agent: 39.8 (#44), Grok 4 Fast: —
| Benchmark | Grok 4.20 Multi-Agent | Grok 4 Fast |
|---|---|---|
| LMArena Vision | 1259 | — |
Multilingual Grok 4.20 Multi-Agent leads
Grok 4.20 Multi-Agent: 54.6 (#40), Grok 4 Fast: 51.5 (#106)
| Benchmark | Grok 4.20 Multi-Agent | Grok 4 Fast |
|---|---|---|
| LMArena Non-English | 1440 | 1397 |
| LMArena Chinese | 1475 | 1458 |
| LMArena French | 1467 | 1433 |
| LMArena German | 1456 | 1383 |
| LMArena Japanese | 1405 | 1358 |
| LMArena Korean | 1416 | 1359 |
| LMArena Russian | 1457 | 1387 |
| LMArena Spanish | 1447 | 1414 |
Instruction Following Grok 4.20 Multi-Agent leads
Grok 4.20 Multi-Agent: 75.0 (#80), Grok 4 Fast: 73.4 (#116)
| Benchmark | Grok 4.20 Multi-Agent | Grok 4 Fast |
|---|---|---|
| LMArena Instruction Following | 1420 | 1388 |
Long Context Grok 4 Fast leads
Grok 4.20 Multi-Agent: 43.7 (#84), Grok 4 Fast: 63.2 (#3)
| Benchmark | Grok 4.20 Multi-Agent | Grok 4 Fast |
|---|---|---|
| LMArena Longer Query | 1430 | 1415 |
| Fiction.LiveBench | — | 94.4% |
Writing & Preference Grok 4.20 Multi-Agent leads
Grok 4.20 Multi-Agent: 64.1 (#57), Grok 4 Fast: 60.2 (#96)
| Benchmark | Grok 4.20 Multi-Agent | Grok 4 Fast |
|---|---|---|
| LMArena Text | 1450 | 1407 |
| LMArena Creative Writing | 1435 | 1388 |
| LMArena Multi-Turn | 1451 | 1414 |
Frequently asked questions
Is Grok 4.20 Multi-Agent better than Grok 4 Fast?
Grok 4.20 Multi-Agent is the stronger model overall, scoring 45.5 to 39.0 on the Noometry Index.
Is Grok 4.20 Multi-Agent or Grok 4 Fast better for coding?
Grok 4.20 Multi-Agent scores higher on coding benchmarks: 42.4 versus 32.3 in the Noometry coding category.
How many benchmarks do Grok 4.20 Multi-Agent and Grok 4 Fast share?
18 benchmarks have published results for both models. Grok 4.20 Multi-Agent has 20 scored results on Noometry and Grok 4 Fast has 30.