Model comparison
Grok 4.20 Multi-Agent vs Llama 3.1-8B
Grok 4.20 Multi-Agent is the stronger model overall, scoring 46.2 to 23.0 on the Noometry Index. Llama 3.1-8B costs 27× 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 . 17 shared benchmarks.
MetaSummary
- They share 17 benchmarks with published results for both. Grok 4.20 Multi-Agent scores higher in 8 categories and Llama 3.1-8B in 0 categories; 8 gaps are clear of the uncertainty.
- The widest gap is in writing & preference, where Grok 4.20 Multi-Agent leads 64.0 to 29.7.
- Llama 3.1-8B is cheaper at $0.05 / $0.08 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.
- Llama 3.1-8B has downloadable open weights; the other is API-only.
Side by side
| Grok 4.20 Multi-Agent | Llama 3.1-8B | |
|---|---|---|
| Provider | xAI | Meta |
| Noometry Index | 46.2 | 23.0 |
| Released | 2026-03-09 | 2024-07-23 |
| Weights | Proprietary | Open |
| Context window | 1M | 128K |
| Max output | 30K | 4K |
| Input $ / M tokens | $1.25 | $0.05 |
| Output $ / M tokens | $2.50 | $0.08 |
| Results tracked | 20 | 43 |
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Category by category
Coding Grok 4.20 Multi-Agent leads
Grok 4.20 Multi-Agent: 43.0 (#92), Llama 3.1-8B: 20.2 (#340)
| Benchmark | Grok 4.20 Multi-Agent | Llama 3.1-8B |
|---|---|---|
| LMArena Coding | 1457 | 1195 |
| SciCode | — | 13.2% |
| WeirdML | — | 1.7% |
| BigCodeBench Instruct | — | 32.8% |
| BigCodeBench Complete | — | 40.5% |
| HumanEval+ | — | 62.8% |
| MBPP+ | — | 55.6% |
Agentic & Tool Use Not comparable
Grok 4.20 Multi-Agent: —, Llama 3.1-8B: 22.5 (#131)
| Benchmark | Grok 4.20 Multi-Agent | Llama 3.1-8B |
|---|---|---|
| Berkeley Function Calling Leaderboard | — | 25.8% |
| BALROG | — | 15.1% |
| LMArena Search | 1204 | — |
Reasoning Grok 4.20 Multi-Agent leads
Grok 4.20 Multi-Agent: 43.9 (#48), Llama 3.1-8B: 14.9 (#321)
| Benchmark | Grok 4.20 Multi-Agent | Llama 3.1-8B |
|---|---|---|
| LMArena Hard Prompts | 1448 | 1175 |
| NYT Connections (extended) | 89.6% | — |
| CritPt | — | 0% |
| Chess Puzzles | — | 0% |
| DTBench | — | 50.9% |
| LMCA | — | 5.4% |
| Epoch Capabilities Index | — | 116.57 |
| PIQA | — | 81.2% |
Math Grok 4.20 Multi-Agent leads
Grok 4.20 Multi-Agent: 39.4 (#104), Llama 3.1-8B: 10.2 (#317)
| Benchmark | Grok 4.20 Multi-Agent | Llama 3.1-8B |
|---|---|---|
| LMArena Math | 1442 | 1179 |
| OTIS Mock AIME 2024-2025 | — | 1.7% |
| Omni-MATH | — | 13.7% |
| MATH Level 5 | — | 22.9% |
| GSM8K | — | 82.4% |
Knowledge Grok 4.20 Multi-Agent leads
Grok 4.20 Multi-Agent: 40.4 (#119), Llama 3.1-8B: 8.0 (#307)
| Benchmark | Grok 4.20 Multi-Agent | Llama 3.1-8B |
|---|---|---|
| LMArena Expert | 1445 | 1144 |
| GPQA Diamond | — | 27% |
| MMLU-Pro | — | 40.6% |
| GPQA (HELM) | — | 24.7% |
| BoolQ | — | 82.8% |
| MMLU | — | 56.1% |
Multimodal Not comparable
Grok 4.20 Multi-Agent: 40.5 (#48), Llama 3.1-8B: —
| Benchmark | Grok 4.20 Multi-Agent | Llama 3.1-8B |
|---|---|---|
| LMArena Vision | 1259 | — |
Multilingual Grok 4.20 Multi-Agent leads
Grok 4.20 Multi-Agent: 54.4 (#43), Llama 3.1-8B: 34.0 (#249)
| Benchmark | Grok 4.20 Multi-Agent | Llama 3.1-8B |
|---|---|---|
| LMArena Non-English | 1440 | 1148 |
| LMArena Chinese | 1475 | 1151 |
| LMArena French | 1466 | 1177 |
| LMArena German | 1456 | 1144 |
| LMArena Japanese | 1405 | 1061 |
| LMArena Korean | 1416 | 1053 |
| LMArena Russian | 1457 | 1158 |
| LMArena Spanish | 1447 | 1169 |
Instruction Following Grok 4.20 Multi-Agent leads
Grok 4.20 Multi-Agent: 74.8 (#84), Llama 3.1-8B: 58.9 (#258)
| Benchmark | Grok 4.20 Multi-Agent | Llama 3.1-8B |
|---|---|---|
| LMArena Instruction Following | 1420 | 1159 |
| IFEval | — | 74.3% |
Long Context Grok 4.20 Multi-Agent leads
Grok 4.20 Multi-Agent: 43.7 (#88), Llama 3.1-8B: 35.8 (#238)
| Benchmark | Grok 4.20 Multi-Agent | Llama 3.1-8B |
|---|---|---|
| LMArena Longer Query | 1431 | 1182 |
Writing & Preference Grok 4.20 Multi-Agent leads
Grok 4.20 Multi-Agent: 64.0 (#59), Llama 3.1-8B: 29.7 (#290)
| Benchmark | Grok 4.20 Multi-Agent | Llama 3.1-8B |
|---|---|---|
| LMArena Text | 1450 | 1187 |
| LMArena Creative Writing | 1436 | 1154 |
| LMArena Multi-Turn | 1452 | 1172 |
| EQ-Bench Creative Writing | — | 713 |
| WildBench | — | 68.7% |
Frequently asked questions
Is Grok 4.20 Multi-Agent better than Llama 3.1-8B?
Grok 4.20 Multi-Agent is the stronger model overall, scoring 46.2 to 23.0 on the Noometry Index. Llama 3.1-8B costs 27× 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 Llama 3.1-8B?
Llama 3.1-8B is cheaper. It lists at $0.05 per million input tokens and $0.08 per million output tokens; Grok 4.20 Multi-Agent lists at $1.25 and $2.50.
Is Grok 4.20 Multi-Agent or Llama 3.1-8B better for coding?
Grok 4.20 Multi-Agent scores higher on coding benchmarks: 43.0 versus 20.2 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 Llama 3.1-8B share?
17 benchmarks have published results for both models. Grok 4.20 Multi-Agent has 20 scored results on Noometry and Llama 3.1-8B has 43.