Model comparison
Gemini 3.8 Flash vs Step 3.5 Flash
Gemini 3.8 Flash is the stronger model overall, scoring 61.8 to 42.3 on the Noometry Index. Step 3.5 Flash costs 10.0× less per token, which makes it the better buy when Gemini 3.8 Flash's lead doesn't matter for your workload.
Last verified . 18 shared benchmarks.
Google
StepFunSummary
- They share 18 benchmarks with published results for both. Gemini 3.8 Flash scores higher in 8 categories and Step 3.5 Flash in 0 categories; 8 gaps are clear of the uncertainty.
- The widest gap is in reasoning, where Gemini 3.8 Flash leads 76.9 to 22.2.
- The biggest single-benchmark swing is NYT Connections (extended): 97.4% for Gemini 3.8 Flash and 28.4% for Step 3.5 Flash.
- Step 3.5 Flash is cheaper at $0.10 / $0.30 per million input/output tokens, against $0.75 / $3.75 for Gemini 3.8 Flash.
- Gemini 3.8 Flash accepts more context: 1.05M tokens versus 256K.
- Step 3.5 Flash has downloadable open weights; the other is API-only.
Side by side
| Gemini 3.8 Flash | Step 3.5 Flash | |
|---|---|---|
| Provider | StepFun | |
| Noometry Index | 61.8 | 42.3 |
| Released | 2026-09-02 | 2026-01-29 |
| Weights | Proprietary | Open |
| Context window | 1.05M | 256K |
| Max output | 66K | 256K |
| Input $ / M tokens | $0.75 | $0.10 |
| Output $ / M tokens | $3.75 | $0.30 |
| Results tracked | 50 | 19 |
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Category by category
Coding Gemini 3.8 Flash leads
Gemini 3.8 Flash: 59.2 (#15), Step 3.5 Flash: 42.4 (#105)
| Benchmark | Gemini 3.8 Flash | Step 3.5 Flash |
|---|---|---|
| LMArena Coding | 1510 | 1436 |
| DeepSWE | 73.8% | — |
| FrontierCode | 41.2% | — |
| CursorBench | 39.6% | — |
| LMArena WebDev | 1584 | — |
| FrontierSWE | 19.6% | — |
| SciCode | 56.6% | — |
| WeirdML | 84.8% | — |
| ALE-Bench | 1,270 | — |
Agentic & Tool Use Not comparable
Gemini 3.8 Flash: 41.8 (#21), Step 3.5 Flash: —
| Benchmark | Gemini 3.8 Flash | Step 3.5 Flash |
|---|---|---|
| APEX-Agents | 64.3% | — |
| Remote Labor Index | 5.8% | — |
| GDP.pdf | 23.4% | — |
| Vending-Bench 2 | 5,094 | — |
Reasoning Gemini 3.8 Flash leads
Gemini 3.8 Flash: 76.9 (#5), Step 3.5 Flash: 22.2 (#202)
| Benchmark | Gemini 3.8 Flash | Step 3.5 Flash |
|---|---|---|
| NYT Connections (extended) | 97.4% | 28.4% |
| LMArena Hard Prompts | 1508 | 1411 |
| ARC-AGI-2 | 89.2% | — |
| ARC-AGI-1 | 98.5% | — |
| CritPt | 18.3% | — |
| Chess Puzzles | 61% | — |
| Mystery Game Puzzles | 47% | — |
| DTBench | 95.7% | — |
| LMCA | 52.9% | — |
| Surface Evolver Bench | 76.9% | — |
| Epoch Capabilities Index | 156.71 | — |
Math Gemini 3.8 Flash leads
Gemini 3.8 Flash: 65.3 (#28), Step 3.5 Flash: 42.6 (#84)
| Benchmark | Gemini 3.8 Flash | Step 3.5 Flash |
|---|---|---|
| LMArena Math | 1528 | 1408 |
| FrontierMath (Tiers 1-3) | 68.4% | — |
| FrontierMath Tier 4 | 22% | — |
| MathArena Final-Answer Competitions | — | 66.8% |
| OTIS Mock AIME 2024-2025 | 98.9% | — |
| ProofBench | 48% | — |
Knowledge Gemini 3.8 Flash leads
Gemini 3.8 Flash: 74.8 (#2), Step 3.5 Flash: 39.6 (#132)
| Benchmark | Gemini 3.8 Flash | Step 3.5 Flash |
|---|---|---|
| LMArena Expert | 1524 | 1421 |
| GPQA Diamond | 95.4% | — |
| Humanity's Last Exam | 44.5% | — |
| SimpleQA Verified | 69.7% | — |
Multimodal Not comparable
Gemini 3.8 Flash: 40.7 (#45), Step 3.5 Flash: —
| Benchmark | Gemini 3.8 Flash | Step 3.5 Flash |
|---|---|---|
| LMArena Vision | 1314 | — |
| Blueprint-Bench 2 | 38.6% | — |
| Furniture Assembly | 31.7% | — |
Multilingual Gemini 3.8 Flash leads
Gemini 3.8 Flash: 58.0 (#5), Step 3.5 Flash: 50.5 (#119)
| Benchmark | Gemini 3.8 Flash | Step 3.5 Flash |
|---|---|---|
| LMArena Non-English | 1491 | 1385 |
| LMArena Chinese | 1554 | 1447 |
| LMArena French | 1498 | 1421 |
| LMArena German | 1493 | 1405 |
| LMArena Japanese | 1502 | 1354 |
| LMArena Korean | 1459 | 1352 |
| LMArena Russian | 1515 | 1385 |
| LMArena Spanish | 1485 | 1419 |
Instruction Following Gemini 3.8 Flash leads
Gemini 3.8 Flash: 78.0 (#13), Step 3.5 Flash: 73.1 (#124)
| Benchmark | Gemini 3.8 Flash | Step 3.5 Flash |
|---|---|---|
| LMArena Instruction Following | 1490 | 1385 |
Long Context Gemini 3.8 Flash leads
Gemini 3.8 Flash: 46.3 (#24), Step 3.5 Flash: 42.8 (#117)
| Benchmark | Gemini 3.8 Flash | Step 3.5 Flash |
|---|---|---|
| LMArena Longer Query | 1508 | 1402 |
Writing & Preference Gemini 3.8 Flash leads
Gemini 3.8 Flash: 72.2 (#15), Step 3.5 Flash: 58.8 (#113)
| Benchmark | Gemini 3.8 Flash | Step 3.5 Flash |
|---|---|---|
| LMArena Text | 1499 | 1403 |
| LMArena Creative Writing | 1492 | 1357 |
| LMArena Multi-Turn | 1501 | 1405 |
| EQ-Bench Creative Writing | 1748 | — |
Frequently asked questions
Is Gemini 3.8 Flash better than Step 3.5 Flash?
Gemini 3.8 Flash is the stronger model overall, scoring 61.8 to 42.3 on the Noometry Index. Step 3.5 Flash costs 10.0× less per token, which makes it the better buy when Gemini 3.8 Flash's lead doesn't matter for your workload.
Which is cheaper, Gemini 3.8 Flash or Step 3.5 Flash?
Step 3.5 Flash is cheaper. It lists at $0.10 per million input tokens and $0.30 per million output tokens; Gemini 3.8 Flash lists at $0.75 and $3.75.
Is Gemini 3.8 Flash or Step 3.5 Flash better for coding?
Gemini 3.8 Flash scores higher on coding benchmarks: 59.2 versus 42.4 in the Noometry coding category.
Which has the bigger context window?
Gemini 3.8 Flash does, with 1.05M tokens against 256K.
How many benchmarks do Gemini 3.8 Flash and Step 3.5 Flash share?
18 benchmarks have published results for both models. Gemini 3.8 Flash has 50 scored results on Noometry and Step 3.5 Flash has 19.