Noometry

Model comparison

Gemini 3.1 Pro Preview vs Step 3.7 Flash

Gemini 3.1 Pro Preview is the stronger model overall, scoring 56.7 to 37.3 on the Noometry Index. Step 3.7 Flash costs 11× less per token, which makes it the better buy when Gemini 3.1 Pro Preview's lead doesn't matter for your workload.

Last verified . 5 shared benchmarks.

Gemini 3.1 Pro Preview Google

56.7

Rank #23 Confirmed

Step 3.7 Flash StepFun

37.3

Rank #207 Reported

Summary

  • They share 5 benchmarks with published results for both. Gemini 3.1 Pro Preview scores higher in 3 categories and Step 3.7 Flash in 0 categories; 3 gaps are clear of the uncertainty.
  • The widest gap is in reasoning, where Gemini 3.1 Pro Preview leads 71.7 to 21.6.
  • The biggest single-benchmark swing is NYT Connections (extended): 97.4% for Gemini 3.1 Pro Preview and 39.7% for Step 3.7 Flash.
  • Step 3.7 Flash is cheaper at $0.18 / $1.11 per million input/output tokens, against $2 / $12 for Gemini 3.1 Pro Preview.
  • Gemini 3.1 Pro Preview accepts more context: 1.05M tokens versus 256K.
  • Step 3.7 Flash has downloadable open weights; the other is API-only.

Side by side

Gemini 3.1 Pro PreviewStep 3.7 Flash
ProviderGoogleStepFun
Noometry Index56.737.3
Released2026-02-192026-05-29
WeightsProprietaryOpen
Context window1.05M256K
Max output66K256K
Input $ / M tokens$2$0.18
Output $ / M tokens$12$1.11
Results tracked715

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Category by category

Coding Gemini 3.1 Pro Preview leads

Gemini 3.1 Pro Preview: 42.5 (#99), Step 3.7 Flash: 40.0 (#150)

BenchmarkGemini 3.1 Pro PreviewStep 3.7 Flash
SciCode58.9%40%
ALE-Bench1,161694.12
SWE-bench Verified75.6%—
DeepSWE11.7%—
LMArena WebDev1447—
GSO22.6%—
WeirdML72.1%—
LMArena Coding1484—
MirrorCode8.9%—
AlgoTune2.02—

Agentic & Tool Use Not comparable

Gemini 3.1 Pro Preview: 37.7 (#34), Step 3.7 Flash: —

BenchmarkGemini 3.1 Pro PreviewStep 3.7 Flash
Terminal-Bench80.2%—
APEX-Agents35.3%—
τ²-bench Banking26%—
DeepResearch Bench47.8%—
PostTrainBench22%—
BALROG57%—
ExploitBench26.1%—
GBAEval0.8%—
GDP.pdf17%—
LMArena Search1211—
METR Time Horizons77%—
Vending-Bench 23,774—

Reasoning Gemini 3.1 Pro Preview leads

Gemini 3.1 Pro Preview: 71.7 (#12), Step 3.7 Flash: 21.6 (#219)

BenchmarkGemini 3.1 Pro PreviewStep 3.7 Flash
NYT Connections (extended)97.4%39.7%
CritPt17.7%2.3%
ARC-AGI-277.1%—
SimpleBench79.6%—
ARC-AGI-198%—
Chess Puzzles55%—
EnigmaEval36.8%—
Thematic Generalization79.4%—
EBR-Bench14.3%—
LMArena Hard Prompts1485—
Mystery Game Puzzles34%—
DTBench97.1%—
LMCA53.8%—
Epoch Capabilities Index154.77—
ForecastBench59—

Math Gemini 3.1 Pro Preview leads

Gemini 3.1 Pro Preview: 62.1 (#34), Step 3.7 Flash: 42.9 (#82)

BenchmarkGemini 3.1 Pro PreviewStep 3.7 Flash
MathArena Final-Answer Competitions86.5%68.5%
FrontierMath (Tiers 1-3)59.6%—
FrontierMath Tier 426.8%—
OTIS Mock AIME 2024-202595.6%—
ProofBench26%—
LMArena Math1485—
FrontierMath (Feb 2025 set)36.9%—
FrontierMath Tier 4 (v1)16.7%—

Knowledge Not comparable

Gemini 3.1 Pro Preview: 71.8 (#3), Step 3.7 Flash: —

BenchmarkGemini 3.1 Pro PreviewStep 3.7 Flash
GPQA Diamond94.4%—
Humanity's Last Exam46.4%—
SimpleQA Verified73.5%—
Vectara Hallucination Rate10.4%—
LMArena Expert1485—

Multimodal Not comparable

Gemini 3.1 Pro Preview: 37.9 (#69), Step 3.7 Flash: —

BenchmarkGemini 3.1 Pro PreviewStep 3.7 Flash
LMArena Vision1296—
Blueprint-Bench 226.5%—
Furniture Assembly26.7%—
LMArena Document1444—

Multilingual Not comparable

Gemini 3.1 Pro Preview: 57.0 (#12), Step 3.7 Flash: —

BenchmarkGemini 3.1 Pro PreviewStep 3.7 Flash
LMArena Non-English1477—
LMArena Chinese1529—
LMArena French1487—
LMArena German1491—
LMArena Japanese1493—
LMArena Korean1455—
LMArena Russian1498—
LMArena Spanish1479—

Instruction Following Not comparable

Gemini 3.1 Pro Preview: 77.0 (#32), Step 3.7 Flash: —

BenchmarkGemini 3.1 Pro PreviewStep 3.7 Flash
LMArena Instruction Following1466—

Long Context Not comparable

Gemini 3.1 Pro Preview: 47.4 (#18), Step 3.7 Flash: —

BenchmarkGemini 3.1 Pro PreviewStep 3.7 Flash
CL-bench20.8%—
CL-bench Life16.9%—
LMArena Longer Query1483—

Writing & Preference Not comparable

Gemini 3.1 Pro Preview: 66.1 (#37), Step 3.7 Flash: —

BenchmarkGemini 3.1 Pro PreviewStep 3.7 Flash
LMArena Text1481—
LMArena Creative Writing1482—
EQ-Bench Creative Writing1491—
EQ-Bench 41142—
LMArena Multi-Turn1488—

Frequently asked questions

Is Gemini 3.1 Pro Preview better than Step 3.7 Flash?

Gemini 3.1 Pro Preview is the stronger model overall, scoring 56.7 to 37.3 on the Noometry Index. Step 3.7 Flash costs 11× less per token, which makes it the better buy when Gemini 3.1 Pro Preview's lead doesn't matter for your workload.

Which is cheaper, Gemini 3.1 Pro Preview or Step 3.7 Flash?

Step 3.7 Flash is cheaper. It lists at $0.18 per million input tokens and $1.11 per million output tokens; Gemini 3.1 Pro Preview lists at $2 and $12.

Is Gemini 3.1 Pro Preview or Step 3.7 Flash better for coding?

Gemini 3.1 Pro Preview scores higher on coding benchmarks: 42.5 versus 40.0 in the Noometry coding category.

Which has the bigger context window?

Gemini 3.1 Pro Preview does, with 1.05M tokens against 256K.

How many benchmarks do Gemini 3.1 Pro Preview and Step 3.7 Flash share?

5 benchmarks have published results for both models. Gemini 3.1 Pro Preview has 71 scored results on Noometry and Step 3.7 Flash has 5.

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