Model comparison
GPT-4.5 vs Step 2 16k Exp 202412
Step 2 16k Exp 202412 is the stronger model overall, scoring 38.6 to 36.9 on the Noometry Index.
Last verified . 12 shared benchmarks.
StepFunSummary
- They share 12 benchmarks with published results for both. GPT-4.5 scores higher in 5 categories and Step 2 16k Exp 202412 in 3 categories; 7 gaps are clear of the uncertainty.
- The widest gap is in reasoning, where Step 2 16k Exp 202412 leads 24.8 to 14.1.
Side by side
| GPT-4.5 | Step 2 16k Exp 202412 | |
|---|---|---|
| Provider | OpenAI | StepFun |
| Noometry Index | 36.9 | 38.6 |
| Released | 2025-02-27 | — |
| Weights | Proprietary | Proprietary |
| Context window | — | — |
| Max output | — | — |
| Input $ / M tokens | — | — |
| Output $ / M tokens | — | — |
| Results tracked | 42 | 12 |
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Category by category
Coding GPT-4.5 leads
GPT-4.5: 41.8 (#102), Step 2 16k Exp 202412: 37.9 (#170)
| Benchmark | GPT-4.5 | Step 2 16k Exp 202412 |
|---|---|---|
| LMArena Coding | 1397 | 1316 |
| Aider Polyglot | 44.9% | — |
| WeirdML | 39.4% | — |
| LiveBench Coding | 75.2% | — |
Agentic & Tool Use Not comparable
GPT-4.5: 27.6 (#92), Step 2 16k Exp 202412: —
| Benchmark | GPT-4.5 | Step 2 16k Exp 202412 |
|---|---|---|
| Cybench | 17.5% | — |
Reasoning Step 2 16k Exp 202412 leads
GPT-4.5: 14.1 (#320), Step 2 16k Exp 202412: 24.8 (#140)
| Benchmark | GPT-4.5 | Step 2 16k Exp 202412 |
|---|---|---|
| LMArena Hard Prompts | 1404 | 1299 |
| ARC-AGI-2 | 0.8% | — |
| SimpleBench | 34.5% | — |
| ARC-AGI-1 | 10.3% | — |
| EnigmaEval | 3.2% | — |
| LiveBench Reasoning | 71.1% | — |
| LiveBench Data Analysis | 64.3% | — |
| Epoch Capabilities Index | 136.74 | — |
| ForecastBench | 61.7 | — |
| LiveBench | 69% | — |
Math Step 2 16k Exp 202412 leads
GPT-4.5: 31.0 (#200), Step 2 16k Exp 202412: 33.6 (#171)
| Benchmark | GPT-4.5 | Step 2 16k Exp 202412 |
|---|---|---|
| LMArena Math | 1412 | 1305 |
| OTIS Mock AIME 2024-2025 | 37.8% | — |
| LiveBench Math | 69.3% | — |
| MATH Level 5 | 78.6% | — |
Knowledge Step 2 16k Exp 202412 leads
GPT-4.5: 32.4 (#205), Step 2 16k Exp 202412: 34.6 (#187)
| Benchmark | GPT-4.5 | Step 2 16k Exp 202412 |
|---|---|---|
| LMArena Expert | 1394 | 1279 |
| GPQA Diamond | 68.7% | — |
| Humanity's Last Exam | 5.4% | — |
| Confabulations | 13.6% | — |
Multimodal Not comparable
GPT-4.5: 37.0 (#68), Step 2 16k Exp 202412: —
| Benchmark | GPT-4.5 | Step 2 16k Exp 202412 |
|---|---|---|
| LMArena Vision | 1195 | — |
| VPCT | 45% | — |
Multilingual GPT-4.5 leads
GPT-4.5: 52.7 (#78), Step 2 16k Exp 202412: 43.9 (#176)
| Benchmark | GPT-4.5 | Step 2 16k Exp 202412 |
|---|---|---|
| LMArena Non-English | 1413 | 1290 |
| LMArena Chinese | 1421 | 1331 |
| LMArena Russian | 1419 | 1324 |
| LMArena French | 1417 | — |
| LMArena German | 1457 | — |
| LMArena Japanese | 1416 | — |
| LMArena Korean | 1392 | — |
Instruction Following GPT-4.5 leads
GPT-4.5: 72.8 (#129), Step 2 16k Exp 202412: 68.1 (#187)
| Benchmark | GPT-4.5 | Step 2 16k Exp 202412 |
|---|---|---|
| LMArena Instruction Following | 1404 | 1287 |
| LiveBench Instruction Following | 72.3% | — |
Long Context Too close to call
GPT-4.5: 40.4 (#150), Step 2 16k Exp 202412: 39.7 (#165)
| Benchmark | GPT-4.5 | Step 2 16k Exp 202412 |
|---|---|---|
| LMArena Longer Query | 1406 | 1307 |
| Fiction.LiveBench | 63.9% | — |
Writing & Preference GPT-4.5 leads
GPT-4.5: 57.1 (#129), Step 2 16k Exp 202412: 52.5 (#168)
| Benchmark | GPT-4.5 | Step 2 16k Exp 202412 |
|---|---|---|
| LMArena Text | 1417 | 1321 |
| LMArena Creative Writing | 1394 | 1328 |
| LMArena Multi-Turn | 1444 | 1292 |
| Short-Story Creative Writing | 75.6% | — |
| EQ-Bench Creative Writing | 1258 | — |
| LiveBench Language | 61.5% | — |
Frequently asked questions
Is GPT-4.5 better than Step 2 16k Exp 202412?
Step 2 16k Exp 202412 is the stronger model overall, scoring 38.6 to 36.9 on the Noometry Index.
Is GPT-4.5 or Step 2 16k Exp 202412 better for coding?
GPT-4.5 scores higher on coding benchmarks: 41.8 versus 37.9 in the Noometry coding category.
How many benchmarks do GPT-4.5 and Step 2 16k Exp 202412 share?
12 benchmarks have published results for both models. GPT-4.5 has 42 scored results on Noometry and Step 2 16k Exp 202412 has 12.