Model comparison
Gemini 3.8 Flash vs Step 2 16k Exp 202412
Gemini 3.8 Flash is the stronger model overall, scoring 59.5 to 38.6 on the Noometry Index.
Last verified . 12 shared benchmarks.
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StepFunSummary
- They share 12 benchmarks with published results for both. Gemini 3.8 Flash 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 Gemini 3.8 Flash leads 74.9 to 34.6.
Side by side
| Gemini 3.8 Flash | Step 2 16k Exp 202412 | |
|---|---|---|
| Provider | StepFun | |
| Noometry Index | 59.5 | 38.6 |
| Released | 2026-09-02 | — |
| Weights | Proprietary | Proprietary |
| Context window | 1.05M | — |
| Max output | 66K | — |
| Input $ / M tokens | $0.75 | — |
| Output $ / M tokens | $3.75 | — |
| Results tracked | 46 | 12 |
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Category by category
Coding Gemini 3.8 Flash leads
Gemini 3.8 Flash: 56.4 (#17), Step 2 16k Exp 202412: 37.9 (#170)
| Benchmark | Gemini 3.8 Flash | Step 2 16k Exp 202412 |
|---|---|---|
| LMArena Coding | 1512 | 1316 |
| DeepSWE | 73.8% | — |
| FrontierCode | 41.2% | — |
| CursorBench | 39.6% | — |
| LMArena WebDev | 1581 | — |
| FrontierSWE | 19.6% | — |
| SciCode | 56.6% | — |
| ALE-Bench | 1,270 | — |
Agentic & Tool Use Not comparable
Gemini 3.8 Flash: 40.3 (#22), Step 2 16k Exp 202412: —
| Benchmark | Gemini 3.8 Flash | Step 2 16k Exp 202412 |
|---|---|---|
| APEX-Agents | 64.3% | — |
| GDP.pdf | 23.4% | — |
| Vending-Bench 2 | 5,094 | — |
Reasoning Gemini 3.8 Flash leads
Gemini 3.8 Flash: 64.7 (#13), Step 2 16k Exp 202412: 24.8 (#140)
| Benchmark | Gemini 3.8 Flash | Step 2 16k Exp 202412 |
|---|---|---|
| LMArena Hard Prompts | 1506 | 1299 |
| NYT Connections (extended) | 97.4% | — |
| CritPt | 18.3% | — |
| Chess Puzzles | 61% | — |
| Mystery Game Puzzles | 47% | — |
| DTBench | 95.7% | — |
| LMCA | 52.9% | — |
| Surface Evolver Bench | 76.9% | — |
| Epoch Capabilities Index | 157.13 | — |
Math Gemini 3.8 Flash leads
Gemini 3.8 Flash: 65.2 (#22), Step 2 16k Exp 202412: 33.6 (#171)
| Benchmark | Gemini 3.8 Flash | Step 2 16k Exp 202412 |
|---|---|---|
| LMArena Math | 1528 | 1305 |
| FrontierMath (Tiers 1-3) | 68.4% | — |
| FrontierMath Tier 4 | 22% | — |
| OTIS Mock AIME 2024-2025 | 98.9% | — |
| ProofBench | 48% | — |
Knowledge Gemini 3.8 Flash leads
Gemini 3.8 Flash: 74.9 (#2), Step 2 16k Exp 202412: 34.6 (#187)
| Benchmark | Gemini 3.8 Flash | Step 2 16k Exp 202412 |
|---|---|---|
| LMArena Expert | 1529 | 1279 |
| GPQA Diamond | 95.4% | — |
| Humanity's Last Exam | 44.5% | — |
| SimpleQA Verified | 69.7% | — |
Multimodal Not comparable
Gemini 3.8 Flash: 40.9 (#33), Step 2 16k Exp 202412: —
| Benchmark | Gemini 3.8 Flash | Step 2 16k Exp 202412 |
|---|---|---|
| LMArena Vision | 1312 | — |
| Blueprint-Bench 2 | 38.6% | — |
| Furniture Assembly | 31.7% | — |
Multilingual Gemini 3.8 Flash leads
Gemini 3.8 Flash: 57.9 (#5), Step 2 16k Exp 202412: 43.9 (#176)
| Benchmark | Gemini 3.8 Flash | Step 2 16k Exp 202412 |
|---|---|---|
| LMArena Non-English | 1486 | 1290 |
| LMArena Chinese | 1547 | 1331 |
| LMArena Russian | 1507 | 1324 |
| LMArena French | 1502 | — |
| LMArena German | 1470 | — |
| LMArena Japanese | 1505 | — |
| LMArena Korean | 1479 | — |
| LMArena Spanish | 1492 | — |
Instruction Following Gemini 3.8 Flash leads
Gemini 3.8 Flash: 78.2 (#11), Step 2 16k Exp 202412: 68.1 (#187)
| Benchmark | Gemini 3.8 Flash | Step 2 16k Exp 202412 |
|---|---|---|
| LMArena Instruction Following | 1489 | 1287 |
Long Context Gemini 3.8 Flash leads
Gemini 3.8 Flash: 46.2 (#23), Step 2 16k Exp 202412: 39.7 (#165)
| Benchmark | Gemini 3.8 Flash | Step 2 16k Exp 202412 |
|---|---|---|
| LMArena Longer Query | 1506 | 1307 |
Writing & Preference Gemini 3.8 Flash leads
Gemini 3.8 Flash: 72.1 (#16), Step 2 16k Exp 202412: 52.5 (#168)
| Benchmark | Gemini 3.8 Flash | Step 2 16k Exp 202412 |
|---|---|---|
| LMArena Text | 1494 | 1321 |
| LMArena Creative Writing | 1485 | 1328 |
| LMArena Multi-Turn | 1503 | 1292 |
| EQ-Bench Creative Writing | 1748 | — |
Frequently asked questions
Is Gemini 3.8 Flash better than Step 2 16k Exp 202412?
Gemini 3.8 Flash is the stronger model overall, scoring 59.5 to 38.6 on the Noometry Index.
Is Gemini 3.8 Flash or Step 2 16k Exp 202412 better for coding?
Gemini 3.8 Flash scores higher on coding benchmarks: 56.4 versus 37.9 in the Noometry coding category.
How many benchmarks do Gemini 3.8 Flash and Step 2 16k Exp 202412 share?
12 benchmarks have published results for both models. Gemini 3.8 Flash has 46 scored results on Noometry and Step 2 16k Exp 202412 has 12.