Model comparison
Grok 4.1 Fast vs Grok 4.20 Multi-Agent
Grok 4.20 Multi-Agent is the stronger model overall, scoring 46.2 to 41.4 on the Noometry Index. Grok 4.1 Fast costs 5.7× less per token, which makes it the better buy when Grok 4.20 Multi-Agent's lead doesn't matter for your workload.
Last verified . 20 shared benchmarks.
Summary
- They share 20 benchmarks with published results for both. Grok 4.1 Fast scores higher in 0 categories and Grok 4.20 Multi-Agent in 9 categories; 8 gaps are clear of the uncertainty.
- The widest gap is in coding, where Grok 4.20 Multi-Agent leads 43.0 to 34.1.
- Grok 4.1 Fast is cheaper at $0.20 / $0.50 per million input/output tokens, against $1.25 / $2.50 for Grok 4.20 Multi-Agent.
- Grok 4.20 Multi-Agent accepts more context: 1M tokens versus 128K.
Side by side
| Grok 4.1 Fast | Grok 4.20 Multi-Agent | |
|---|---|---|
| Provider | xAI | xAI |
| Noometry Index | 41.4 | 46.2 |
| Released | 2025-06-27 | 2026-03-09 |
| Weights | Proprietary | Proprietary |
| Context window | 128K | 1M |
| Max output | 30K | 30K |
| Input $ / M tokens | $0.20 | $1.25 |
| Output $ / M tokens | $0.50 | $2.50 |
| Results tracked | 32 | 20 |
Sponsored placements are available on pages like this one. Advertise on Noometry
Category by category
Coding Grok 4.20 Multi-Agent leads
Grok 4.1 Fast: 34.1 (#245), Grok 4.20 Multi-Agent: 43.0 (#92)
| Benchmark | Grok 4.1 Fast | Grok 4.20 Multi-Agent |
|---|---|---|
| LMArena Coding | 1411 | 1457 |
| LMArena WebDev | 1242 | — |
| ALE-Bench | 394.93 | — |
Agentic & Tool Use Not comparable
Grok 4.1 Fast: 36.3 (#39), Grok 4.20 Multi-Agent: —
| Benchmark | Grok 4.1 Fast | Grok 4.20 Multi-Agent |
|---|---|---|
| LMArena Search | 1171 | 1204 |
| Berkeley Function Calling Leaderboard | 69.6% | — |
| τ²-bench Banking | 13.1% | — |
| Vending-Bench 2 | 1,107 | — |
Reasoning Too close to call
Grok 4.1 Fast: 43.4 (#49), Grok 4.20 Multi-Agent: 43.9 (#48)
| Benchmark | Grok 4.1 Fast | Grok 4.20 Multi-Agent |
|---|---|---|
| NYT Connections (extended) | 87.4% | 89.6% |
| LMArena Hard Prompts | 1407 | 1448 |
| SimpleBench | 56% | — |
| DTBench | 87.7% | — |
| ForecastBench | 61 | — |
Math Grok 4.20 Multi-Agent leads
Grok 4.1 Fast: 31.9 (#221), Grok 4.20 Multi-Agent: 39.4 (#104)
| Benchmark | Grok 4.1 Fast | Grok 4.20 Multi-Agent |
|---|---|---|
| LMArena Math | 1408 | 1442 |
| MathArena Final-Answer Competitions | 60.9% | — |
| ProofBench | 4% | — |
Knowledge Grok 4.20 Multi-Agent leads
Grok 4.1 Fast: 33.1 (#207), Grok 4.20 Multi-Agent: 40.4 (#119)
| Benchmark | Grok 4.1 Fast | Grok 4.20 Multi-Agent |
|---|---|---|
| LMArena Expert | 1399 | 1445 |
| Vectara Hallucination Rate | 17.8% | — |
Multimodal Grok 4.20 Multi-Agent leads
Grok 4.1 Fast: 37.0 (#76), Grok 4.20 Multi-Agent: 40.5 (#48)
| Benchmark | Grok 4.1 Fast | Grok 4.20 Multi-Agent |
|---|---|---|
| LMArena Vision | 1201 | 1259 |
Multilingual Grok 4.20 Multi-Agent leads
Grok 4.1 Fast: 51.0 (#114), Grok 4.20 Multi-Agent: 54.4 (#43)
| Benchmark | Grok 4.1 Fast | Grok 4.20 Multi-Agent |
|---|---|---|
| LMArena Non-English | 1391 | 1440 |
| LMArena Chinese | 1441 | 1475 |
| LMArena French | 1415 | 1466 |
| LMArena German | 1404 | 1456 |
| LMArena Japanese | 1349 | 1405 |
| LMArena Korean | 1361 | 1416 |
| LMArena Russian | 1387 | 1457 |
| LMArena Spanish | 1413 | 1447 |
Instruction Following Grok 4.20 Multi-Agent leads
Grok 4.1 Fast: 72.7 (#133), Grok 4.20 Multi-Agent: 74.8 (#84)
| Benchmark | Grok 4.1 Fast | Grok 4.20 Multi-Agent |
|---|---|---|
| LMArena Instruction Following | 1376 | 1420 |
Long Context Grok 4.20 Multi-Agent leads
Grok 4.1 Fast: 42.4 (#126), Grok 4.20 Multi-Agent: 43.7 (#88)
| Benchmark | Grok 4.1 Fast | Grok 4.20 Multi-Agent |
|---|---|---|
| LMArena Longer Query | 1390 | 1431 |
Writing & Preference Grok 4.20 Multi-Agent leads
Grok 4.1 Fast: 57.2 (#131), Grok 4.20 Multi-Agent: 64.0 (#59)
| Benchmark | Grok 4.1 Fast | Grok 4.20 Multi-Agent |
|---|---|---|
| LMArena Text | 1408 | 1450 |
| LMArena Creative Writing | 1394 | 1436 |
| LMArena Multi-Turn | 1389 | 1452 |
| EQ-Bench Creative Writing | 1327 | — |
Frequently asked questions
Is Grok 4.1 Fast better than Grok 4.20 Multi-Agent?
Grok 4.20 Multi-Agent is the stronger model overall, scoring 46.2 to 41.4 on the Noometry Index. Grok 4.1 Fast costs 5.7× less per token, which makes it the better buy when Grok 4.20 Multi-Agent's lead doesn't matter for your workload.
Which is cheaper, Grok 4.1 Fast or Grok 4.20 Multi-Agent?
Grok 4.1 Fast is cheaper. It lists at $0.20 per million input tokens and $0.50 per million output tokens; Grok 4.20 Multi-Agent lists at $1.25 and $2.50.
Is Grok 4.1 Fast or Grok 4.20 Multi-Agent better for coding?
Grok 4.20 Multi-Agent scores higher on coding benchmarks: 43.0 versus 34.1 in the Noometry coding category.
Which has the bigger context window?
Grok 4.20 Multi-Agent does, with 1M tokens against 128K.
How many benchmarks do Grok 4.1 Fast and Grok 4.20 Multi-Agent share?
20 benchmarks have published results for both models. Grok 4.1 Fast has 32 scored results on Noometry and Grok 4.20 Multi-Agent has 20.