Gemini 3 Flash Preview vs Gemma 4 31B

Updated October 21, 2026. 17 benchmarks have a result for both. Coding is ranked on the Vibe Coding Index; every other board is shown as published.

Replace Gemini 3 Flash Preview Replace Gemma 4 31B

Gemini 3 Flash PreviewGoogle

Coding: 75.8
Overall: 26.3
Output $/M: $3.00

Gemma 4 31BGoogle

Coding: 38.3
Overall: 14.7
Output $/M: $0.40

vs boards won of 17 shared

Decision reading

Pick Gemini 3 Flash Preview for coding: it scores 75.8 on the Vibe Coding Index against 38.3 for Gemma 4 31B, though on 1 benchmark against 2.

Pick Gemma 4 31B when output tokens cost 7.5x less, or when the benchmark that matters is SAGE (Vals AI), where it leads.

Model AGemini 3 Flash PreviewGoogle75.8/1001 independent benchmark$0.37 per solved task Model BGemma 4 31BGoogle38.3/1002 independent benchmarksNo cost per solved task

175251

Shared results: 17
Gemini 3 Flash Preview only: 52
Gemma 4 31B only: 51
Like-for-like categories: 7 of 9

Shared results can support a head-to-head reading. Results only one model has describe coverage, not superiority.

Which one for your work

Each card is decided by one number both models carry. Where only one has it, the card says so and makes no call.

Coding
Vibe Coding Index, four public coding benchmarks
Gemini 3 Flash Preview
Gemini 3 Flash Preview scores 75.8 against 38.3.
1 and 2 benchmarks behind the scores
Intelligence
AA Intelligence Index
Gemini 3 Flash Preview
Gemini 3 Flash Preview leads, 26.3 against 14.7.
Same board, both measured
Agentic work
AA Agentic Index
No call
Only Gemma 4 31B has a AA Agentic Index result, 4.2.
Directional only
Reasoning
GPQA Diamond
No call
Only Gemini 3 Flash Preview has a GPQA Diamond result, 87.9%.
Directional only
Math
AIME
No call
Only Gemini 3 Flash Preview has a AIME result, 95.6%.
Directional only
Knowledge
MMLU Pro
No call
Only Gemini 3 Flash Preview has a MMLU Pro result, 88.6%.
Directional only
Web design
Design Arena: websites
No call
Only Gemini 3 Flash Preview has a Design Arena: websites result, 1196.
Directional only
Long documents
Listed context window
Gemini 3 Flash Preview
Gemini 3 Flash Preview takes 1.05M tokens against 262K.
Listed by OpenRouter
Everyday cost
1K input + 500 output tokens
Gemma 4 31B
Gemini 3 Flash Preview $0.0020, Gemma 4 31B $0.0004 per turn.
List prices
Cost per solved task
One SWE-bench Verified task, solved
No call
Only Gemini 3 Flash Preview has the number, $0.37.
Directional only

At a glance

Coding index: Gemini 3 Flash Preview 75.8 from 1 benchmark, Gemma 4 31B 38.3 from 2 benchmarks.
Widest category: Knowledge, 22.3 points apart on average over 3 shared benchmarks.
Widest single gap: SimpleQA Verified: Gemini 3 Flash Preview 66.8% against Gemma 4 31B 10.4%, 56.4 points apart on a 0 to 100 scale.
Output price: Gemini 3 Flash Preview $3.00 against Gemma 4 31B $0.40 per million output tokens, 7.5x apart.
Context window: Gemini 3 Flash Preview takes 1.05M tokens, Gemma 4 31B 262K.

Benchmark by benchmark

First the score: boards each model leads, per category, where both have a result. Then every board, a category to a fold; bars are each result on a 0 to 100 scale, so compare the two in a row, not one row with another.

Boards won, where both have a result
Category	Gemini 3 Flash Preview	Gemma 4 31B
Coding	3	0
Intelligence	1	0
Agentic work	1	0
Reasoning	3	0
Math	1	0
Knowledge	3	0
General	4	1
All shared boards	16	1

CodingLike-for-likeFour of these boards feed the Vibe Coding Index30

Coding benchmarks for Gemini 3 Flash Preview and Gemma 4 31B
Benchmark	Gemini 3 Flash Preview	Gemma 4 31B	Leader
SWE-bench Verified	75.8%	Not measured	Only Gemini 3 Flash Preview measured
LiveBench coding	Not measured	49.0%	Only Gemma 4 31B measured
LMArena WebDev	Not measured	1367	Only Gemma 4 31B measured
AA Coding Index	Not measured	43.4	Only Gemma 4 31B measured
LiveCodeBench (Vals AI)	85.6%	Not measured	Only Gemini 3 Flash Preview measured
SWE-bench Verified (Vals AI)	75.0%	Not measured	Only Gemini 3 Flash Preview measured
Vibe Code Bench (Vals AI)	20.2%	Not measured	Only Gemini 3 Flash Preview measured
Code migration (Vals AI)	6.4%	Not measured	Only Gemini 3 Flash Preview measured
ProgramBench (Vals AI)	0.0%	Not measured	Only Gemini 3 Flash Preview measured
Terminal-Bench 2.1 (Vals AI)	53.9%	Not measured	Only Gemini 3 Flash Preview measured
LiveCodeBench (Artificial Analysis run)	90.8%	Not measured	Only Gemini 3 Flash Preview measured
SciCode	Not measured	45.5%	Only Gemma 4 31B measured
Terminal-Bench Hard (Artificial Analysis run)	38.6%	36.4%	Gemini 3 Flash Preview
Terminal-Bench	64.3%	Not measured	Only Gemini 3 Flash Preview measured
GSO-Bench	9.8%	Not measured	Only Gemini 3 Flash Preview measured
WeirdML	61.6%	52.3%	Gemini 3 Flash Preview
ALE-Bench	1367.2	925.5	Gemini 3 Flash Preview
LMArena Text: coding	Not measured	1459	Only Gemma 4 31B measured
LMArena Text: software and IT	Not measured	1463	Only Gemma 4 31B measured
LMArena WebDev: React	Not measured	1359	Only Gemma 4 31B measured
LMArena WebDev: HTML	Not measured	1380	Only Gemma 4 31B measured
Neither model has a result on the other 17 boards here

IntelligenceLike-for-likePublic boards, shown as published, kept out of the index10

Intelligence benchmarks for Gemini 3 Flash Preview and Gemma 4 31B
Benchmark	Gemini 3 Flash Preview	Gemma 4 31B	Leader
AA Intelligence Index	26.3	14.7	Gemini 3 Flash Preview
Epoch Capabilities Index	Not measured	143.0	Only Gemma 4 31B measured

Agentic workLike-for-likePublic boards, shown as published, kept out of the index10

Agentic work benchmarks for Gemini 3 Flash Preview and Gemma 4 31B
Benchmark	Gemini 3 Flash Preview	Gemma 4 31B	Leader
AA Agentic Index	Not measured	4.2	Only Gemma 4 31B measured
Design Arena: agents building web apps	1111	Not measured	Only Gemini 3 Flash Preview measured
Design Arena: agents building full-stack apps	1063	Not measured	Only Gemini 3 Flash Preview measured
Design Arena: agents building mobile apps	1090	Not measured	Only Gemini 3 Flash Preview measured
Design Arena: agents building Android apps	1056	Not measured	Only Gemini 3 Flash Preview measured
Design Arena: agents building Godot games	1161	Not measured	Only Gemini 3 Flash Preview measured
Design Arena: PowerPoint slides	1036	Not measured	Only Gemini 3 Flash Preview measured
LiveBench research	Not measured	44.4%	Only Gemma 4 31B measured
LiveBench browser	Not measured	4.0%	Only Gemma 4 31B measured
LiveBench long agentic	Not measured	13.3%	Only Gemma 4 31B measured
Finance Agent (Vals AI)	42.5%	Not measured	Only Gemini 3 Flash Preview measured
Tax Agent Bench (Vals AI)	11.8%	Not measured	Only Gemini 3 Flash Preview measured
Legal Research Bench (Vals AI)	18.3%	Not measured	Only Gemini 3 Flash Preview measured
Excel Modeling Benchmark (Vals AI)	26.0%	Not measured	Only Gemini 3 Flash Preview measured
τ²-Bench Telecom	80.4%	65.5%	Gemini 3 Flash Preview
BALROG	48.1%	Not measured	Only Gemini 3 Flash Preview measured
DeepResearch Bench	49.8%	Not measured	Only Gemini 3 Flash Preview measured
Vending-Bench 2	$3,635	Not measured	Only Gemini 3 Flash Preview measured
Neither model has a result on the other 21 boards here

ReasoningLike-for-likePublic boards, shown as published, kept out of the index30

Reasoning benchmarks for Gemini 3 Flash Preview and Gemma 4 31B
Benchmark	Gemini 3 Flash Preview	Gemma 4 31B	Leader
GPQA Diamond	87.9%	Not measured	Only Gemini 3 Flash Preview measured
LiveBench reasoning	Not measured	68.3%	Only Gemma 4 31B measured
MMMU Pro (Vals AI)	87.6%	Not measured	Only Gemini 3 Flash Preview measured
GPQA Diamond (Artificial Analysis run)	89.8%	85.7%	Gemini 3 Flash Preview
Humanity's Last Exam (Artificial Analysis run)	36.6%	23.6%	Gemini 3 Flash Preview
GPQA Diamond (Epoch AI run)	89.4%	75.8%	Gemini 3 Flash Preview
ARC-AGI	84.7%	Not measured	Only Gemini 3 Flash Preview measured
ARC-AGI-2	33.6%	Not measured	Only Gemini 3 Flash Preview measured
SimpleBench	61.1%	Not measured	Only Gemini 3 Flash Preview measured
Chess puzzles	39.0%	Not measured	Only Gemini 3 Flash Preview measured
Mystery game puzzles	26.0%	Not measured	Only Gemini 3 Flash Preview measured
VPCT	72.6%	Not measured	Only Gemini 3 Flash Preview measured
LMArena Text: hard prompts	Not measured	1448	Only Gemma 4 31B measured
LMArena Text: expert	Not measured	1464	Only Gemma 4 31B measured
LMArena Text: hard prompts in English	Not measured	1456	Only Gemma 4 31B measured
LMArena Vision: diagrams	Not measured	1283	Only Gemma 4 31B measured
LMArena Vision: homework	Not measured	1310	Only Gemma 4 31B measured
Neither model has a result on the other 4 boards here

MathLike-for-likePublic boards, shown as published, kept out of the index10

Math benchmarks for Gemini 3 Flash Preview and Gemma 4 31B
Benchmark	Gemini 3 Flash Preview	Gemma 4 31B	Leader
AIME	95.6%	Not measured	Only Gemini 3 Flash Preview measured
MGSM (Vals AI)	93.3%	Not measured	Only Gemini 3 Flash Preview measured
AA Math Index	97.0	Not measured	Only Gemini 3 Flash Preview measured
AIME 2025 (Artificial Analysis run)	97.0%	Not measured	Only Gemini 3 Flash Preview measured
OTIS Mock AIME	95.6%	73.3%	Gemini 3 Flash Preview
FrontierMath, tiers 1 to 3	51.2%	Not measured	Only Gemini 3 Flash Preview measured
FrontierMath, tier 4	17.1%	Not measured	Only Gemini 3 Flash Preview measured
ProofBench	15.0%	Not measured	Only Gemini 3 Flash Preview measured
LMArena Text: math	Not measured	1463	Only Gemma 4 31B measured
LMArena Text: mathematical work	Not measured	1465	Only Gemma 4 31B measured
Neither model has a result on the other 3 boards here

KnowledgeLike-for-likePublic boards, shown as published, kept out of the index30

Knowledge benchmarks for Gemini 3 Flash Preview and Gemma 4 31B
Benchmark	Gemini 3 Flash Preview	Gemma 4 31B	Leader
MMLU Pro	88.6%	Not measured	Only Gemini 3 Flash Preview measured
LegalBench (Vals AI)	86.9%	Not measured	Only Gemini 3 Flash Preview measured
CaseLaw (Vals AI)	55.8%	52.6%	Gemini 3 Flash Preview
CorpFin (Vals AI)	66.4%	Not measured	Only Gemini 3 Flash Preview measured
TaxEval (Vals AI)	73.9%	Not measured	Only Gemini 3 Flash Preview measured
MortgageTax (Vals AI)	68.7%	61.4%	Gemini 3 Flash Preview
MedQA (Vals AI)	95.8%	Not measured	Only Gemini 3 Flash Preview measured
MedCode (Vals AI)	55.9%	Not measured	Only Gemini 3 Flash Preview measured
MMLU Pro (Artificial Analysis run)	89.0%	Not measured	Only Gemini 3 Flash Preview measured
SimpleQA Verified	66.8%	10.4%	Gemini 3 Flash Preview
GeoBench	88.0%	Not measured	Only Gemini 3 Flash Preview measured
LMArena Text: science	Not measured	1457	Only Gemma 4 31B measured
LMArena Text: medicine and healthcare	Not measured	1451	Only Gemma 4 31B measured
LMArena Text: legal and government	Not measured	1438	Only Gemma 4 31B measured
LMArena Text: business and finance	Not measured	1430	Only Gemma 4 31B measured
Neither model has a result on the other 2 boards here

Web designDirectional onlyPublic boards, shown as published, kept out of the index5 boards, none shared

Web design benchmarks for Gemini 3 Flash Preview and Gemma 4 31B
Benchmark	Gemini 3 Flash Preview	Gemma 4 31B	Leader
Design Arena: websites	1196	Not measured	Only Gemini 3 Flash Preview measured
Design Arena: game dev	1166	Not measured	Only Gemini 3 Flash Preview measured
Design Arena: 3D	1184	Not measured	Only Gemini 3 Flash Preview measured
Design Arena: all code categories	1189	Not measured	Only Gemini 3 Flash Preview measured
LiveBench design	Not measured	58.4%	Only Gemma 4 31B measured
Neither model has a result on the other 4 boards here

GeneralLike-for-likePublic boards, shown as published, kept out of the index41

General benchmarks for Gemini 3 Flash Preview and Gemma 4 31B
Benchmark	Gemini 3 Flash Preview	Gemma 4 31B	Leader
LiveBench data analysis	Not measured	53.3%	Only Gemma 4 31B measured
SAGE (Vals AI)	51.8%	55.0%	Gemma 4 31B
MedScribe (Vals AI)	69.9%	Not measured	Only Gemini 3 Flash Preview measured
Vals Multimodal Index	52.2%	Not measured	Only Gemini 3 Flash Preview measured
IFBench	78.0%	75.6%	Gemini 3 Flash Preview
Long context reasoning (AA-LCR)	78.0%	69.7%	Gemini 3 Flash Preview
DTBench	89.1%	82.7%	Gemini 3 Flash Preview
LMCA	43.1%	39.3%	Gemini 3 Flash Preview
Surface Evolver Bench	Not measured	30.6%	Only Gemma 4 31B measured
LMArena Text	Not measured	1443	Only Gemma 4 31B measured
LMArena Text: instruction following	Not measured	1433	Only Gemma 4 31B measured
LMArena Text: creative writing	Not measured	1417	Only Gemma 4 31B measured
LMArena Vision	Not measured	1276	Only Gemma 4 31B measured
LMArena Text: English	Not measured	1451	Only Gemma 4 31B measured
LMArena Text: non-English	Not measured	1430	Only Gemma 4 31B measured
LMArena Text: Chinese	Not measured	1475	Only Gemma 4 31B measured
LMArena Text: French	Not measured	1436	Only Gemma 4 31B measured
LMArena Text: Spanish	Not measured	1442	Only Gemma 4 31B measured
LMArena Text: Russian	Not measured	1460	Only Gemma 4 31B measured
LMArena Text: Polish	Not measured	1433	Only Gemma 4 31B measured
LMArena Text: multi-turn	Not measured	1452	Only Gemma 4 31B measured
LMArena Text: longer queries	Not measured	1446	Only Gemma 4 31B measured
LMArena Text: writing and language	Not measured	1432	Only Gemma 4 31B measured
LMArena Text: entertainment and media	Not measured	1405	Only Gemma 4 31B measured
LMArena Vision: English	Not measured	1271	Only Gemma 4 31B measured
LMArena Vision: Chinese	Not measured	1326	Only Gemma 4 31B measured
LMArena Vision: reading text	Not measured	1282	Only Gemma 4 31B measured
LMArena Vision: humor	Not measured	1280	Only Gemma 4 31B measured
LMArena Vision: captioning	Not measured	1218	Only Gemma 4 31B measured
LMArena Vision: recognizing things	Not measured	1226	Only Gemma 4 31B measured
LMArena Vision: creative writing	Not measured	1285	Only Gemma 4 31B measured
LMArena Document	Not measured	1425	Only Gemma 4 31B measured
Neither model has a result on the other 14 boards here

Image generationNot comparablePublic boards, shown as published, kept out of the index0 boards, none shared

Image generation benchmarks for Gemini 3 Flash Preview and Gemma 4 31B
Benchmark	Gemini 3 Flash Preview	Gemma 4 31B	Leader
Neither model has a result on 5 boards here

What each workload costs

Three fixed token mixes at each model's listed price, so per-token rates become a bill.

Chat turn

1K input + 500 output tokens

Gemini 3 Flash Preview$0.0020Fits in one request

Gemma 4 31B$0.0004Fits in one request

Gemma 4 31B costs less

Repository review

50K input + 3K output tokens

Gemini 3 Flash Preview$0.034Fits in one request

Gemma 4 31B$0.011Fits in one request

Gemma 4 31B costs less

Agent loop

200K input + 10K output tokens

Gemini 3 Flash Preview$0.130Fits in one request

Gemma 4 31B$0.044Fits in one request

Gemma 4 31B costs less

Listed OpenRouter rates, without cache or batch discounts. A workload that does not fit a model's context window would need splitting.

Specification differences

The leading value in a row is marked; a row with a missing value names no leader. Our two rows are marked in red.

Specifications of Gemini 3 Flash Preview and Gemma 4 31B
Specification	Google Gemini 3 Flash Preview	Google Gemma 4 31B
Maker	Google	Google
Weights	No public weights listed	Open weights
Released	December 17, 2025	April 2, 2026
Context window	1.05M	262K
Input $/Mtok	$0.50	$0.20
Output $/Mtok	$3.00	$0.40
Coding index	75.8	38.3
Independent measurements behind it	1	2
Cost per solved task	$0.37	Not computable
Source	OpenRouter listing	OpenRouter listing

Questions

Is Gemini 3 Flash Preview better than Gemma 4 31B for coding?

Pick Gemini 3 Flash Preview for coding: it scores 75.8 on the Vibe Coding Index against 38.3 for Gemma 4 31B, though on 1 benchmark against 2. Pick Gemma 4 31B when output tokens cost 7.5x less, or when the benchmark that matters is SAGE (Vals AI), where it leads.

Which is cheaper, Gemini 3 Flash Preview or Gemma 4 31B?

Gemini 3 Flash Preview costs $0.50 per million input tokens and $3.00 per million output tokens; Gemma 4 31B costs $0.20 and $0.40. Cost per solved task is known for Gemini 3 Flash Preview only.

Which has the bigger context window, Gemini 3 Flash Preview or Gemma 4 31B?

Gemini 3 Flash Preview, with 1.05M tokens against 262K.

How many benchmarks is the Gemini 3 Flash Preview vs Gemma 4 31B comparison based on?

17 benchmarks have a result for both models as of October 21, 2026. Gemini 3 Flash Preview's coding index rests on 1 independent benchmark and Gemma 4 31B's on 2. Where only one model has a result, the page says so instead of naming a winner.

Decision reading

Which one for your work

Coding

Intelligence

Agentic work

Reasoning

Math

Knowledge

Web design

Long documents

Everyday cost

Cost per solved task

At a glance

Benchmark by benchmark

What each workload costs

Chat turn

Repository review

Agent loop

Specification differences

Questions

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