Model comparison
Llama 3.1-405B vs Step 2 16k Exp 202412
Step 2 16k Exp 202412 is the stronger model overall, scoring 39.2 to 30.7 on the Noometry Index.
Last verified . 12 shared benchmarks.
Meta
StepFunSummary
- They share 12 benchmarks with published results for both. Llama 3.1-405B scores higher in 0 categories and Step 2 16k Exp 202412 in 8 categories; 8 gaps are clear of the uncertainty.
- The widest gap is in math, where Step 2 16k Exp 202412 leads 36.3 to 18.4.
- Llama 3.1-405B has downloadable open weights; the other is API-only.
Side by side
| Llama 3.1-405B | Step 2 16k Exp 202412 | |
|---|---|---|
| Provider | Meta | StepFun |
| Noometry Index | 30.7 | 39.2 |
| Released | 2024-07-23 | — |
| Weights | Open | Proprietary |
| Context window | — | — |
| Max output | — | — |
| Input $ / M tokens | — | — |
| Output $ / M tokens | — | — |
| Results tracked | 42 | 12 |
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Category by category
Coding Step 2 16k Exp 202412 leads
Llama 3.1-405B: 33.1 (#262), Step 2 16k Exp 202412: 38.5 (#174)
| Benchmark | Llama 3.1-405B | Step 2 16k Exp 202412 |
|---|---|---|
| LMArena Coding | 1291 | 1316 |
| WeirdML | 21.4% | — |
Agentic & Tool Use Not comparable
Llama 3.1-405B: 21.0 (#140), Step 2 16k Exp 202412: —
| Benchmark | Llama 3.1-405B | Step 2 16k Exp 202412 |
|---|---|---|
| TheAgentCompany | 7.4% | — |
| Cybench | 7.5% | — |
Reasoning Step 2 16k Exp 202412 leads
Llama 3.1-405B: 16.8 (#300), Step 2 16k Exp 202412: 25.9 (#142)
| Benchmark | Llama 3.1-405B | Step 2 16k Exp 202412 |
|---|---|---|
| LMArena Hard Prompts | 1269 | 1299 |
| SimpleBench | 23% | — |
| Kagi LLM Benchmark | 45% | — |
| DTBench | 61.4% | — |
| BIG-Bench Hard | 82.9% | — |
| Epoch Capabilities Index | 128.75 | — |
| ForecastBench | 59.9 | — |
| HellaSwag | 89.2% | — |
| PIQA | 85.9% | — |
| WinoGrande | 89.2% | — |
Math Step 2 16k Exp 202412 leads
Llama 3.1-405B: 18.4 (#290), Step 2 16k Exp 202412: 36.3 (#169)
| Benchmark | Llama 3.1-405B | Step 2 16k Exp 202412 |
|---|---|---|
| LMArena Math | 1281 | 1304 |
| OTIS Mock AIME 2024-2025 | 9.7% | — |
| Omni-MATH | 24.9% | — |
| MATH Level 5 | 49.8% | — |
Knowledge Step 2 16k Exp 202412 leads
Llama 3.1-405B: 30.4 (#227), Step 2 16k Exp 202412: 35.2 (#187)
| Benchmark | Llama 3.1-405B | Step 2 16k Exp 202412 |
|---|---|---|
| LMArena Expert | 1243 | 1279 |
| GPQA Diamond | 50.9% | — |
| MMLU-Pro | 72.3% | — |
| Confabulations | 17.6% | — |
| GPQA (HELM) | 52.2% | — |
| ARC (AI2) Challenge | 95.3% | — |
| MMLU | 84.5% | — |
| TriviaQA | 82.7% | — |
Multilingual Step 2 16k Exp 202412 leads
Llama 3.1-405B: 40.7 (#214), Step 2 16k Exp 202412: 43.7 (#181)
| Benchmark | Llama 3.1-405B | Step 2 16k Exp 202412 |
|---|---|---|
| LMArena Non-English | 1248 | 1290 |
| LMArena Chinese | 1242 | 1331 |
| LMArena Russian | 1265 | 1324 |
| LMArena French | 1279 | — |
| LMArena German | 1252 | — |
| LMArena Japanese | 1208 | — |
| LMArena Korean | 1184 | — |
| LMArena Spanish | 1260 | — |
Instruction Following Step 2 16k Exp 202412 leads
Llama 3.1-405B: 65.9 (#214), Step 2 16k Exp 202412: 67.9 (#192)
| Benchmark | Llama 3.1-405B | Step 2 16k Exp 202412 |
|---|---|---|
| LMArena Instruction Following | 1259 | 1287 |
| IFEval | 81.1% | — |
Long Context Step 2 16k Exp 202412 leads
Llama 3.1-405B: 38.4 (#197), Step 2 16k Exp 202412: 39.7 (#170)
| Benchmark | Llama 3.1-405B | Step 2 16k Exp 202412 |
|---|---|---|
| LMArena Longer Query | 1266 | 1307 |
Writing & Preference Step 2 16k Exp 202412 leads
Llama 3.1-405B: 38.9 (#251), Step 2 16k Exp 202412: 52.3 (#173)
| Benchmark | Llama 3.1-405B | Step 2 16k Exp 202412 |
|---|---|---|
| LMArena Text | 1284 | 1321 |
| LMArena Creative Writing | 1262 | 1328 |
| LMArena Multi-Turn | 1297 | 1292 |
| EQ-Bench Creative Writing | 870 | — |
| WildBench | 78.3% | — |
Frequently asked questions
Is Llama 3.1-405B better than Step 2 16k Exp 202412?
Step 2 16k Exp 202412 is the stronger model overall, scoring 39.2 to 30.7 on the Noometry Index.
Is Llama 3.1-405B or Step 2 16k Exp 202412 better for coding?
Step 2 16k Exp 202412 scores higher on coding benchmarks: 38.5 versus 33.1 in the Noometry coding category.
How many benchmarks do Llama 3.1-405B and Step 2 16k Exp 202412 share?
12 benchmarks have published results for both models. Llama 3.1-405B has 42 scored results on Noometry and Step 2 16k Exp 202412 has 12.