Model comparison
Gemini 3.1 Pro Preview vs Step 2 16k Exp 202412
Gemini 3.1 Pro Preview is the stronger model overall, scoring 56.7 to 39.2 on the Noometry Index.
Last verified . 12 shared benchmarks.
Google
StepFunSummary
- They share 12 benchmarks with published results for both. Gemini 3.1 Pro Preview 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 reasoning, where Gemini 3.1 Pro Preview leads 71.7 to 25.9.
Side by side
| Gemini 3.1 Pro Preview | Step 2 16k Exp 202412 | |
|---|---|---|
| Provider | StepFun | |
| Noometry Index | 56.7 | 39.2 |
| Released | 2026-02-19 | — |
| Weights | Proprietary | Proprietary |
| Context window | 1.05M | — |
| Max output | 66K | — |
| Input $ / M tokens | $2 | — |
| Output $ / M tokens | $12 | — |
| Results tracked | 71 | 12 |
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Category by category
Coding Gemini 3.1 Pro Preview leads
Gemini 3.1 Pro Preview: 42.5 (#99), Step 2 16k Exp 202412: 38.5 (#174)
| Benchmark | Gemini 3.1 Pro Preview | Step 2 16k Exp 202412 |
|---|---|---|
| LMArena Coding | 1484 | 1316 |
| SWE-bench Verified | 75.6% | — |
| DeepSWE | 11.7% | — |
| LMArena WebDev | 1447 | — |
| SciCode | 58.9% | — |
| GSO | 22.6% | — |
| WeirdML | 72.1% | — |
| MirrorCode | 8.9% | — |
| ALE-Bench | 1,161 | — |
| AlgoTune | 2.02 | — |
Agentic & Tool Use Not comparable
Gemini 3.1 Pro Preview: 37.7 (#34), Step 2 16k Exp 202412: —
| Benchmark | Gemini 3.1 Pro Preview | Step 2 16k Exp 202412 |
|---|---|---|
| Terminal-Bench | 80.2% | — |
| APEX-Agents | 35.3% | — |
| τ²-bench Banking | 26% | — |
| DeepResearch Bench | 47.8% | — |
| PostTrainBench | 22% | — |
| BALROG | 57% | — |
| ExploitBench | 26.1% | — |
| GBAEval | 0.8% | — |
| GDP.pdf | 17% | — |
| LMArena Search | 1211 | — |
| METR Time Horizons | 77% | — |
| Vending-Bench 2 | 3,774 | — |
Reasoning Gemini 3.1 Pro Preview leads
Gemini 3.1 Pro Preview: 71.7 (#12), Step 2 16k Exp 202412: 25.9 (#142)
| Benchmark | Gemini 3.1 Pro Preview | Step 2 16k Exp 202412 |
|---|---|---|
| LMArena Hard Prompts | 1485 | 1299 |
| ARC-AGI-2 | 77.1% | — |
| SimpleBench | 79.6% | — |
| NYT Connections (extended) | 97.4% | — |
| ARC-AGI-1 | 98% | — |
| CritPt | 17.7% | — |
| Chess Puzzles | 55% | — |
| EnigmaEval | 36.8% | — |
| Thematic Generalization | 79.4% | — |
| EBR-Bench | 14.3% | — |
| Mystery Game Puzzles | 34% | — |
| DTBench | 97.1% | — |
| LMCA | 53.8% | — |
| Epoch Capabilities Index | 154.77 | — |
| ForecastBench | 59 | — |
Math Gemini 3.1 Pro Preview leads
Gemini 3.1 Pro Preview: 62.1 (#34), Step 2 16k Exp 202412: 36.3 (#169)
| Benchmark | Gemini 3.1 Pro Preview | Step 2 16k Exp 202412 |
|---|---|---|
| LMArena Math | 1485 | 1304 |
| FrontierMath (Tiers 1-3) | 59.6% | — |
| FrontierMath Tier 4 | 26.8% | — |
| MathArena Final-Answer Competitions | 86.5% | — |
| OTIS Mock AIME 2024-2025 | 95.6% | — |
| ProofBench | 26% | — |
| FrontierMath (Feb 2025 set) | 36.9% | — |
| FrontierMath Tier 4 (v1) | 16.7% | — |
Knowledge Gemini 3.1 Pro Preview leads
Gemini 3.1 Pro Preview: 71.8 (#3), Step 2 16k Exp 202412: 35.2 (#187)
| Benchmark | Gemini 3.1 Pro Preview | Step 2 16k Exp 202412 |
|---|---|---|
| LMArena Expert | 1485 | 1279 |
| GPQA Diamond | 94.4% | — |
| Humanity's Last Exam | 46.4% | — |
| SimpleQA Verified | 73.5% | — |
| Vectara Hallucination Rate | 10.4% | — |
Multimodal Not comparable
Gemini 3.1 Pro Preview: 37.9 (#69), Step 2 16k Exp 202412: —
| Benchmark | Gemini 3.1 Pro Preview | Step 2 16k Exp 202412 |
|---|---|---|
| LMArena Vision | 1296 | — |
| Blueprint-Bench 2 | 26.5% | — |
| Furniture Assembly | 26.7% | — |
| LMArena Document | 1444 | — |
Multilingual Gemini 3.1 Pro Preview leads
Gemini 3.1 Pro Preview: 57.0 (#12), Step 2 16k Exp 202412: 43.7 (#181)
| Benchmark | Gemini 3.1 Pro Preview | Step 2 16k Exp 202412 |
|---|---|---|
| LMArena Non-English | 1477 | 1290 |
| LMArena Chinese | 1529 | 1331 |
| LMArena Russian | 1498 | 1324 |
| LMArena French | 1487 | — |
| LMArena German | 1491 | — |
| LMArena Japanese | 1493 | — |
| LMArena Korean | 1455 | — |
| LMArena Spanish | 1479 | — |
Instruction Following Gemini 3.1 Pro Preview leads
Gemini 3.1 Pro Preview: 77.0 (#32), Step 2 16k Exp 202412: 67.9 (#192)
| Benchmark | Gemini 3.1 Pro Preview | Step 2 16k Exp 202412 |
|---|---|---|
| LMArena Instruction Following | 1466 | 1287 |
Long Context Gemini 3.1 Pro Preview leads
Gemini 3.1 Pro Preview: 47.4 (#18), Step 2 16k Exp 202412: 39.7 (#170)
| Benchmark | Gemini 3.1 Pro Preview | Step 2 16k Exp 202412 |
|---|---|---|
| LMArena Longer Query | 1483 | 1307 |
| CL-bench | 20.8% | — |
| CL-bench Life | 16.9% | — |
Writing & Preference Gemini 3.1 Pro Preview leads
Gemini 3.1 Pro Preview: 66.1 (#37), Step 2 16k Exp 202412: 52.3 (#173)
| Benchmark | Gemini 3.1 Pro Preview | Step 2 16k Exp 202412 |
|---|---|---|
| LMArena Text | 1481 | 1321 |
| LMArena Creative Writing | 1482 | 1328 |
| LMArena Multi-Turn | 1488 | 1292 |
| EQ-Bench Creative Writing | 1491 | — |
| EQ-Bench 4 | 1142 | — |
Frequently asked questions
Is Gemini 3.1 Pro Preview better than Step 2 16k Exp 202412?
Gemini 3.1 Pro Preview is the stronger model overall, scoring 56.7 to 39.2 on the Noometry Index.
Is Gemini 3.1 Pro Preview or Step 2 16k Exp 202412 better for coding?
Gemini 3.1 Pro Preview scores higher on coding benchmarks: 42.5 versus 38.5 in the Noometry coding category.
How many benchmarks do Gemini 3.1 Pro Preview and Step 2 16k Exp 202412 share?
12 benchmarks have published results for both models. Gemini 3.1 Pro Preview has 71 scored results on Noometry and Step 2 16k Exp 202412 has 12.