Model comparison
Grok 4.20 Multi-Agent vs Mercury 2
Grok 4.20 Multi-Agent is the stronger model overall, scoring 46.2 to 39.1 on the Noometry Index. Mercury 2 costs 4.2× 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 . 11 shared benchmarks.
Summary
- They share 11 benchmarks with published results for both. Grok 4.20 Multi-Agent scores higher in 7 categories and Mercury 2 in 0 categories; 7 gaps are clear of the uncertainty.
- The widest gap is in reasoning, where Grok 4.20 Multi-Agent leads 43.9 to 23.8.
- Mercury 2 is cheaper at $0.25 / $0.75 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 4.20 Multi-Agent | Mercury 2 | |
|---|---|---|
| Provider | xAI | Inception |
| Noometry Index | 46.2 | 39.1 |
| Released | 2026-03-09 | 2026-02-20 |
| Weights | Proprietary | Proprietary |
| Context window | 1M | 128K |
| Max output | 30K | 50K |
| Input $ / M tokens | $1.25 | $0.25 |
| Output $ / M tokens | $2.50 | $0.75 |
| Results tracked | 20 | 17 |
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Category by category
Coding Grok 4.20 Multi-Agent leads
Grok 4.20 Multi-Agent: 43.0 (#92), Mercury 2: 33.5 (#255)
| Benchmark | Grok 4.20 Multi-Agent | Mercury 2 |
|---|---|---|
| LMArena Coding | 1457 | 1391 |
| LMArena WebDev | — | 1171 |
| SciCode | — | 38.7% |
| WeirdML | — | 43.2% |
| ALE-Bench | — | 785.58 |
Agentic & Tool Use Not comparable
Grok 4.20 Multi-Agent: —, Mercury 2: —
| Benchmark | Grok 4.20 Multi-Agent | Mercury 2 |
|---|---|---|
| LMArena Search | 1204 | — |
Reasoning Grok 4.20 Multi-Agent leads
Grok 4.20 Multi-Agent: 43.9 (#48), Mercury 2: 23.8 (#170)
| Benchmark | Grok 4.20 Multi-Agent | Mercury 2 |
|---|---|---|
| LMArena Hard Prompts | 1448 | 1362 |
| NYT Connections (extended) | 89.6% | — |
| CritPt | — | 0.8% |
Math Not comparable
Grok 4.20 Multi-Agent: 39.4 (#104), Mercury 2: —
| Benchmark | Grok 4.20 Multi-Agent | Mercury 2 |
|---|---|---|
| LMArena Math | 1442 | — |
Knowledge Grok 4.20 Multi-Agent leads
Grok 4.20 Multi-Agent: 40.4 (#119), Mercury 2: 36.2 (#172)
| Benchmark | Grok 4.20 Multi-Agent | Mercury 2 |
|---|---|---|
| LMArena Expert | 1445 | 1358 |
| Vectara Hallucination Rate | — | 12.3% |
Multimodal Not comparable
Grok 4.20 Multi-Agent: 40.5 (#48), Mercury 2: —
| Benchmark | Grok 4.20 Multi-Agent | Mercury 2 |
|---|---|---|
| LMArena Vision | 1259 | — |
Multilingual Grok 4.20 Multi-Agent leads
Grok 4.20 Multi-Agent: 54.4 (#43), Mercury 2: 46.6 (#157)
| Benchmark | Grok 4.20 Multi-Agent | Mercury 2 |
|---|---|---|
| LMArena Non-English | 1440 | 1331 |
| LMArena Chinese | 1475 | 1417 |
| LMArena Russian | 1457 | 1304 |
| LMArena French | 1466 | — |
| LMArena German | 1456 | — |
| LMArena Japanese | 1405 | — |
| LMArena Korean | 1416 | — |
| LMArena Spanish | 1447 | — |
Instruction Following Grok 4.20 Multi-Agent leads
Grok 4.20 Multi-Agent: 74.8 (#84), Mercury 2: 70.2 (#165)
| Benchmark | Grok 4.20 Multi-Agent | Mercury 2 |
|---|---|---|
| LMArena Instruction Following | 1420 | 1329 |
Long Context Grok 4.20 Multi-Agent leads
Grok 4.20 Multi-Agent: 43.7 (#88), Mercury 2: 40.5 (#154)
| Benchmark | Grok 4.20 Multi-Agent | Mercury 2 |
|---|---|---|
| LMArena Longer Query | 1431 | 1330 |
Writing & Preference Grok 4.20 Multi-Agent leads
Grok 4.20 Multi-Agent: 64.0 (#59), Mercury 2: 53.8 (#155)
| Benchmark | Grok 4.20 Multi-Agent | Mercury 2 |
|---|---|---|
| LMArena Text | 1450 | 1355 |
| LMArena Creative Writing | 1436 | 1289 |
| LMArena Multi-Turn | 1452 | 1358 |
Frequently asked questions
Is Grok 4.20 Multi-Agent better than Mercury 2?
Grok 4.20 Multi-Agent is the stronger model overall, scoring 46.2 to 39.1 on the Noometry Index. Mercury 2 costs 4.2× 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 4.20 Multi-Agent or Mercury 2?
Mercury 2 is cheaper. It lists at $0.25 per million input tokens and $0.75 per million output tokens; Grok 4.20 Multi-Agent lists at $1.25 and $2.50.
Is Grok 4.20 Multi-Agent or Mercury 2 better for coding?
Grok 4.20 Multi-Agent scores higher on coding benchmarks: 43.0 versus 33.5 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 4.20 Multi-Agent and Mercury 2 share?
11 benchmarks have published results for both models. Grok 4.20 Multi-Agent has 20 scored results on Noometry and Mercury 2 has 17.