Model comparison
Claude Opus 4 vs Step 2 16k Exp 202412
Claude Opus 4 is the stronger model overall, scoring 42.9 to 38.6 on the Noometry Index.
Last verified . 12 shared benchmarks.
StepFunSummary
- They share 12 benchmarks with published results for both. Claude Opus 4 scores higher in 7 categories and Step 2 16k Exp 202412 in 1 category; 7 gaps are clear of the uncertainty.
- The widest gap is in coding, where Claude Opus 4 leads 47.8 to 37.9.
Side by side
| Claude Opus 4 | Step 2 16k Exp 202412 | |
|---|---|---|
| Provider | Anthropic | StepFun |
| Noometry Index | 42.9 | 38.6 |
| Released | 2025-05-22 | — |
| Weights | Proprietary | Proprietary |
| Context window | 200K | — |
| Max output | 32K | — |
| Input $ / M tokens | $15 | — |
| Output $ / M tokens | $75 | — |
| Results tracked | 56 | 12 |
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Category by category
Coding Claude Opus 4 leads
Claude Opus 4: 47.8 (#55), Step 2 16k Exp 202412: 37.9 (#170)
| Benchmark | Claude Opus 4 | Step 2 16k Exp 202412 |
|---|---|---|
| LMArena Coding | 1442 | 1316 |
| SWE-bench Verified | 70.7% | — |
| SWE-bench Verified (bash only) | 67.6% | — |
| Aider Polyglot | 72% | — |
| GSO | 6.9% | — |
| WeirdML | 43.7% | — |
| AlgoTune | 1.33 | — |
Agentic & Tool Use Not comparable
Claude Opus 4: 34.5 (#39), Step 2 16k Exp 202412: —
| Benchmark | Claude Opus 4 | Step 2 16k Exp 202412 |
|---|---|---|
| Cybench | 38% | — |
| DeepResearch Bench | 46.8% | — |
| LMArena Search | 1127 | — |
| METR Time Horizons | 63.9% | — |
Reasoning Claude Opus 4 leads
Claude Opus 4: 27.4 (#104), Step 2 16k Exp 202412: 24.8 (#140)
| Benchmark | Claude Opus 4 | Step 2 16k Exp 202412 |
|---|---|---|
| LMArena Hard Prompts | 1399 | 1299 |
| ARC-AGI-2 | 8.6% | — |
| SimpleBench | 58.8% | — |
| Kagi LLM Benchmark | 74.3% | — |
| ARC-AGI-1 | 35.7% | — |
| CritPt | 0.3% | — |
| EnigmaEval | 5.6% | — |
| DTBench | 81.6% | — |
| LMCA | 37.4% | — |
| Epoch Capabilities Index | 142.67 | — |
| ForecastBench | 61.1 | — |
Math Claude Opus 4 leads
Claude Opus 4: 40.2 (#80), Step 2 16k Exp 202412: 33.6 (#171)
| Benchmark | Claude Opus 4 | Step 2 16k Exp 202412 |
|---|---|---|
| LMArena Math | 1391 | 1305 |
| OTIS Mock AIME 2024-2025 | 64.4% | — |
| Omni-MATH | 61.6% | — |
| MATH Level 5 | 85% | — |
| FrontierMath (Feb 2025 set) | 4.5% | — |
| FrontierMath Tier 4 (v1) | 4.2% | — |
Knowledge Claude Opus 4 leads
Claude Opus 4: 43.9 (#82), Step 2 16k Exp 202412: 34.6 (#187)
| Benchmark | Claude Opus 4 | Step 2 16k Exp 202412 |
|---|---|---|
| LMArena Expert | 1384 | 1279 |
| GPQA Diamond | 76.3% | — |
| Humanity's Last Exam | 10.7% | — |
| MMLU-Pro | 87.5% | — |
| Confabulations | 15.9% | — |
| Vectara Hallucination Rate | 12% | — |
| GPQA (HELM) | 70.8% | — |
Multimodal Not comparable
Claude Opus 4: 30.9 (#101), Step 2 16k Exp 202412: —
| Benchmark | Claude Opus 4 | Step 2 16k Exp 202412 |
|---|---|---|
| LMArena Vision | 1192 | — |
| GeoBench | 49% | — |
| VPCT | 38% | — |
Multilingual Claude Opus 4 leads
Claude Opus 4: 49.0 (#133), Step 2 16k Exp 202412: 43.9 (#176)
| Benchmark | Claude Opus 4 | Step 2 16k Exp 202412 |
|---|---|---|
| LMArena Non-English | 1362 | 1290 |
| LMArena Chinese | 1386 | 1331 |
| LMArena Russian | 1392 | 1324 |
| LMArena French | 1370 | — |
| LMArena German | 1391 | — |
| LMArena Japanese | 1332 | — |
| LMArena Korean | 1318 | — |
| LMArena Spanish | 1388 | — |
Instruction Following Claude Opus 4 leads
Claude Opus 4: 77.3 (#26), Step 2 16k Exp 202412: 68.1 (#187)
| Benchmark | Claude Opus 4 | Step 2 16k Exp 202412 |
|---|---|---|
| LMArena Instruction Following | 1406 | 1287 |
| IFEval | 91.8% | — |
Long Context Too close to call
Claude Opus 4: 39.5 (#167), Step 2 16k Exp 202412: 39.7 (#165)
| Benchmark | Claude Opus 4 | Step 2 16k Exp 202412 |
|---|---|---|
| LMArena Longer Query | 1422 | 1307 |
| Fiction.LiveBench | 61.1% | — |
Writing & Preference Claude Opus 4 leads
Claude Opus 4: 61.4 (#85), Step 2 16k Exp 202412: 52.5 (#168)
| Benchmark | Claude Opus 4 | Step 2 16k Exp 202412 |
|---|---|---|
| LMArena Text | 1377 | 1321 |
| LMArena Creative Writing | 1386 | 1328 |
| LMArena Multi-Turn | 1396 | 1292 |
| Short-Story Creative Writing | 83.6% | — |
| EQ-Bench Creative Writing | 1580 | — |
| WildBench | 85.2% | — |
Frequently asked questions
Is Claude Opus 4 better than Step 2 16k Exp 202412?
Claude Opus 4 is the stronger model overall, scoring 42.9 to 38.6 on the Noometry Index.
Is Claude Opus 4 or Step 2 16k Exp 202412 better for coding?
Claude Opus 4 scores higher on coding benchmarks: 47.8 versus 37.9 in the Noometry coding category.
How many benchmarks do Claude Opus 4 and Step 2 16k Exp 202412 share?
12 benchmarks have published results for both models. Claude Opus 4 has 56 scored results on Noometry and Step 2 16k Exp 202412 has 12.