Model comparison
o3 vs Step 2 16k Exp 202412
o3 is the stronger model overall, scoring 47.4 to 38.6 on the Noometry Index.
Last verified . 12 shared benchmarks.
StepFunSummary
- They share 12 benchmarks with published results for both. o3 scores higher in 8 categories and Step 2 16k Exp 202412 in 0 categories; 8 gaps are clear of the uncertainty.
- The widest gap is in knowledge, where o3 leads 54.5 to 34.6.
Side by side
| o3 | Step 2 16k Exp 202412 | |
|---|---|---|
| Provider | OpenAI | StepFun |
| Noometry Index | 47.4 | 38.6 |
| Released | 2025-04-16 | — |
| Weights | Proprietary | Proprietary |
| Context window | 200K | — |
| Max output | 100K | — |
| Input $ / M tokens | $2 | — |
| Output $ / M tokens | $8 | — |
| Results tracked | 63 | 12 |
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Category by category
Coding o3 leads
o3: 47.3 (#57), Step 2 16k Exp 202412: 37.9 (#170)
| Benchmark | o3 | Step 2 16k Exp 202412 |
|---|---|---|
| LMArena Coding | 1408 | 1316 |
| SWE-bench Verified | 62.3% | — |
| SWE-bench Verified (bash only) | 58.4% | — |
| Aider Polyglot | 81.3% | — |
| GSO | 8.8% | — |
| WeirdML | 52.4% | — |
| CadEval | 74% | — |
| ALE-Bench | 933.55 | — |
Agentic & Tool Use Not comparable
o3: 34.3 (#42), Step 2 16k Exp 202412: —
| Benchmark | o3 | Step 2 16k Exp 202412 |
|---|---|---|
| Berkeley Function Calling Leaderboard | 63% | — |
| GDPval | 30.8% | — |
| DeepResearch Bench | 45.2% | — |
| OSWorld | 23% | — |
| LMArena Search | 1144 | — |
| METR Time Horizons | 65.4% | — |
Reasoning o3 leads
o3: 32.1 (#66), Step 2 16k Exp 202412: 24.8 (#140)
| Benchmark | o3 | Step 2 16k Exp 202412 |
|---|---|---|
| LMArena Hard Prompts | 1402 | 1299 |
| ARC-AGI-2 | 6.5% | — |
| SimpleBench | 53.1% | — |
| Kagi LLM Benchmark | 67.6% | — |
| ARC-AGI-1 | 60.8% | — |
| CritPt | 1.4% | — |
| Chess Puzzles | 38% | — |
| EnigmaEval | 13.1% | — |
| Mystery Game Puzzles | 29% | — |
| DTBench | 84.8% | — |
| LMCA | 39.7% | — |
| Epoch Capabilities Index | 146.88 | — |
| ForecastBench | 62.5 | — |
Math o3 leads
o3: 48.9 (#49), Step 2 16k Exp 202412: 33.6 (#171)
| Benchmark | o3 | Step 2 16k Exp 202412 |
|---|---|---|
| LMArena Math | 1426 | 1305 |
| FrontierMath (Tiers 1-3) | 33.3% | — |
| OTIS Mock AIME 2024-2025 | 84.4% | — |
| Omni-MATH | 71.4% | — |
| MATH Level 5 | 97.8% | — |
| FrontierMath (Feb 2025 set) | 18.7% | — |
| FrontierMath Tier 4 (v1) | 2.1% | — |
Knowledge o3 leads
o3: 54.5 (#47), Step 2 16k Exp 202412: 34.6 (#187)
| Benchmark | o3 | Step 2 16k Exp 202412 |
|---|---|---|
| LMArena Expert | 1403 | 1279 |
| GPQA Diamond | 81.8% | — |
| Humanity's Last Exam | 20.3% | — |
| SimpleQA Verified | 49.4% | — |
| MMLU-Pro | 85.9% | — |
| Confabulations | 14.4% | — |
| GPQA (HELM) | 75.3% | — |
Multimodal Not comparable
o3: 40.7 (#35), Step 2 16k Exp 202412: —
| Benchmark | o3 | Step 2 16k Exp 202412 |
|---|---|---|
| LMArena Vision | 1214 | — |
| GeoBench | 74% | — |
| VPCT | 52% | — |
Multilingual o3 leads
o3: 51.9 (#99), Step 2 16k Exp 202412: 43.9 (#176)
| Benchmark | o3 | Step 2 16k Exp 202412 |
|---|---|---|
| LMArena Non-English | 1402 | 1290 |
| LMArena Chinese | 1438 | 1331 |
| LMArena Russian | 1407 | 1324 |
| LMArena French | 1430 | — |
| LMArena German | 1420 | — |
| LMArena Japanese | 1404 | — |
| LMArena Korean | 1371 | — |
| LMArena Spanish | 1395 | — |
Instruction Following o3 leads
o3: 73.0 (#122), Step 2 16k Exp 202412: 68.1 (#187)
| Benchmark | o3 | Step 2 16k Exp 202412 |
|---|---|---|
| LMArena Instruction Following | 1368 | 1287 |
| IFEval | 86.9% | — |
Long Context o3 leads
o3: 53.2 (#6), Step 2 16k Exp 202412: 39.7 (#165)
| Benchmark | o3 | Step 2 16k Exp 202412 |
|---|---|---|
| LMArena Longer Query | 1372 | 1307 |
| Fiction.LiveBench | 88.9% | — |
| CL-bench | 17.8% | — |
Writing & Preference o3 leads
o3: 63.7 (#62), Step 2 16k Exp 202412: 52.5 (#168)
| Benchmark | o3 | Step 2 16k Exp 202412 |
|---|---|---|
| LMArena Text | 1410 | 1321 |
| LMArena Creative Writing | 1359 | 1328 |
| LMArena Multi-Turn | 1405 | 1292 |
| Short-Story Creative Writing | 83.9% | — |
| EQ-Bench Creative Writing | 1676 | — |
| WildBench | 86.1% | — |
Frequently asked questions
Is o3 better than Step 2 16k Exp 202412?
o3 is the stronger model overall, scoring 47.4 to 38.6 on the Noometry Index.
Is o3 or Step 2 16k Exp 202412 better for coding?
o3 scores higher on coding benchmarks: 47.3 versus 37.9 in the Noometry coding category.
How many benchmarks do o3 and Step 2 16k Exp 202412 share?
12 benchmarks have published results for both models. o3 has 63 scored results on Noometry and Step 2 16k Exp 202412 has 12.