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Gemma 4 31B vs o3 Mini

Updated October 21, 2026. 40 benchmarks have a result for both. Coding is ranked on the Vibe Coding Index; every other board is shown as published.

Replace Gemma 4 31B Replace o3 Mini
Gemma 4 31BGoogle
Coding
38.3
Overall
14.7
Output $/M
$0.40
37
o3 MiniOpenAI
Coding
52.1
Overall
12.5
Output $/M
$4.40
3
vs boards won of 40 shared

Decision reading

Pick o3 Mini for coding: it scores 52.1 on the Vibe Coding Index against 38.3 for Gemma 4 31B.

Pick Gemma 4 31B when output tokens cost 11.0x less, or when the context window is larger, 262K against 200K tokens.

Model AGemma 4 31BGoogle38.3/1002 independent benchmarksNo cost per solved taskModel Bo3 MiniOpenAI52.1/1002 independent benchmarksNo cost per solved task
Shared results
40
Gemma 4 31B only
28
o3 Mini only
30
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.

At a glance

Coding index
Gemma 4 31B 38.3 from 2 benchmarks, o3 Mini 52.1 from 2 benchmarks.
Widest category
Agentic work, 34.2 points apart on average over 1 shared benchmark.
Widest single gap
τ²-Bench Telecom: Gemma 4 31B 65.5% against o3 Mini 31.3%, 34.2 points apart on a 0 to 100 scale.
Output price
Gemma 4 31B $0.40 against o3 Mini $4.40 per million output tokens, 11.0x apart.
Context window
Gemma 4 31B takes 262K tokens, o3 Mini 200K.

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
CategoryGemma 4 31BBarso3 MiniTies
Coding50
Intelligence20
Agentic work10
Reasoning51
Math21
Knowledge41
General180
All shared boards373
CodingLike-for-likeFour of these boards feed the Vibe Coding Index50
Coding benchmarks for Gemma 4 31B and o3 Mini
BenchmarkGemma 4 31Bo3 MiniLeader
Aider polyglotNot measured60.4%Only o3 Mini measured
SWE-bench VerifiedNot measured42.4%Only o3 Mini measured
SWE-bench LiteNot measured32.3%Only o3 Mini measured
LiveBench coding49.0%Not measuredOnly Gemma 4 31B measured
LMArena WebDev1367Not measuredOnly Gemma 4 31B measured
AA Coding Index43.4Not measuredOnly Gemma 4 31B measured
LiveCodeBench (Vals AI)Not measured71.5%Only o3 Mini measured
LiveCodeBench (Artificial Analysis run)Not measured73.4%Only o3 Mini measured
SciCode45.5%42.8%Gemma 4 31B
Terminal-Bench Hard (Artificial Analysis run)36.4%6.8%Gemma 4 31B
GSO-BenchNot measured1.3%Only o3 Mini measured
WeirdML52.3%43.7%Gemma 4 31B
CybenchNot measured22.5%Only o3 Mini measured
ALE-Bench925.5Not measuredOnly Gemma 4 31B measured
LMArena Text: coding14591378Gemma 4 31B
LMArena Text: software and IT14631364Gemma 4 31B
LMArena WebDev: React1359Not measuredOnly Gemma 4 31B measured
LMArena WebDev: HTML1380Not measuredOnly Gemma 4 31B measured
Neither model has a result on the other 20 boards here
IntelligenceLike-for-likePublic boards, shown as published, kept out of the index20
Intelligence benchmarks for Gemma 4 31B and o3 Mini
BenchmarkGemma 4 31Bo3 MiniLeader
AA Intelligence Index14.712.5Gemma 4 31B
Epoch Capabilities Index143.0140.2Gemma 4 31B
Agentic workLike-for-likePublic boards, shown as published, kept out of the index10
Agentic work benchmarks for Gemma 4 31B and o3 Mini
BenchmarkGemma 4 31Bo3 MiniLeader
AA Agentic Index4.2Not measuredOnly Gemma 4 31B measured
LiveBench research44.4%Not measuredOnly Gemma 4 31B measured
LiveBench browser4.0%Not measuredOnly Gemma 4 31B measured
LiveBench long agentic13.3%Not measuredOnly Gemma 4 31B measured
τ²-Bench Telecom65.5%31.3%Gemma 4 31B
Neither model has a result on the other 34 boards here
ReasoningLike-for-likePublic boards, shown as published, kept out of the index51
Reasoning benchmarks for Gemma 4 31B and o3 Mini
BenchmarkGemma 4 31Bo3 MiniLeader
GPQA DiamondNot measured75.5%Only o3 Mini measured
LiveBench reasoning68.3%Not measuredOnly Gemma 4 31B measured
GPQA Diamond (Artificial Analysis run)85.7%77.3%Gemma 4 31B
Humanity's Last Exam (Artificial Analysis run)23.6%12.0%Gemma 4 31B
GPQA Diamond (Epoch AI run)75.8%77.0%o3 Mini
ARC-AGINot measured34.5%Only o3 Mini measured
ARC-AGI-2Not measured3.0%Only o3 Mini measured
SimpleBenchNot measured22.8%Only o3 Mini measured
Chess puzzlesNot measured15.0%Only o3 Mini measured
Mystery game puzzlesNot measured7.0%Only o3 Mini measured
LMArena Text: hard prompts14481365Gemma 4 31B
LMArena Text: expert14641364Gemma 4 31B
LMArena Text: hard prompts in English14561375Gemma 4 31B
LMArena Vision: diagrams1283Not measuredOnly Gemma 4 31B measured
LMArena Vision: homework1310Not measuredOnly Gemma 4 31B measured
Neither model has a result on the other 6 boards here
MathLike-for-likePublic boards, shown as published, kept out of the index21
Math benchmarks for Gemma 4 31B and o3 Mini
BenchmarkGemma 4 31Bo3 MiniLeader
AIMENot measured86.5%Only o3 Mini measured
MATH 500 (Vals AI)Not measured91.8%Only o3 Mini measured
MGSM (Vals AI)Not measured91.3%Only o3 Mini measured
OTIS Mock AIME73.3%76.9%o3 Mini
FrontierMath, tiers 1 to 3Not measured18.6%Only o3 Mini measured
FrontierMath, tier 4Not measured0.0%Only o3 Mini measured
MATH level 5Not measured96.5%Only o3 Mini measured
LMArena Text: math14631396Gemma 4 31B
LMArena Text: mathematical work14651399Gemma 4 31B
Neither model has a result on the other 4 boards here
KnowledgeLike-for-likePublic boards, shown as published, kept out of the index41
Knowledge benchmarks for Gemma 4 31B and o3 Mini
BenchmarkGemma 4 31Bo3 MiniLeader
MMLU ProNot measured78.7%Only o3 Mini measured
LegalBench (Vals AI)Not measured71.5%Only o3 Mini measured
CaseLaw (Vals AI)52.6%Not measuredOnly Gemma 4 31B measured
CorpFin (Vals AI)Not measured45.3%Only o3 Mini measured
TaxEval (Vals AI)Not measured69.4%Only o3 Mini measured
MortgageTax (Vals AI)61.4%Not measuredOnly Gemma 4 31B measured
MedQA (Vals AI)Not measured94.8%Only o3 Mini measured
MMLU Pro (Artificial Analysis run)Not measured80.2%Only o3 Mini measured
SimpleQA Verified10.4%15.3%o3 Mini
LMArena Text: science14571339Gemma 4 31B
LMArena Text: medicine and healthcare14511330Gemma 4 31B
LMArena Text: legal and government14381328Gemma 4 31B
LMArena Text: business and finance14301313Gemma 4 31B
Neither model has a result on the other 4 boards here
Web designDirectional onlyPublic boards, shown as published, kept out of the index1 board, none shared
Web design benchmarks for Gemma 4 31B and o3 Mini
BenchmarkGemma 4 31Bo3 MiniLeader
LiveBench design58.4%Not measuredOnly Gemma 4 31B measured
Neither model has a result on the other 8 boards here
GeneralLike-for-likePublic boards, shown as published, kept out of the index180
General benchmarks for Gemma 4 31B and o3 Mini
BenchmarkGemma 4 31Bo3 MiniLeader
LiveBench data analysis53.3%Not measuredOnly Gemma 4 31B measured
SAGE (Vals AI)55.0%Not measuredOnly Gemma 4 31B measured
IFBench75.6%67.1%Gemma 4 31B
Long context reasoning (AA-LCR)69.7%43.0%Gemma 4 31B
DTBench82.7%68.8%Gemma 4 31B
LMCA39.3%19.0%Gemma 4 31B
Fiction.LiveBenchNot measured50.0%Only o3 Mini measured
Creative writing (Lech Mazur)Not measured61.7%Only o3 Mini measured
Surface Evolver Bench30.6%Not measuredOnly Gemma 4 31B measured
LMArena Text14431337Gemma 4 31B
LMArena Text: instruction following14331337Gemma 4 31B
LMArena Text: creative writing14171286Gemma 4 31B
LMArena Vision1276Not measuredOnly Gemma 4 31B measured
LMArena Text: English14511351Gemma 4 31B
LMArena Text: non-English14301319Gemma 4 31B
LMArena Text: Chinese14751379Gemma 4 31B
LMArena Text: GermanNot measured1303Only o3 Mini measured
LMArena Text: JapaneseNot measured1286Only o3 Mini measured
LMArena Text: KoreanNot measured1313Only o3 Mini measured
LMArena Text: French14361334Gemma 4 31B
LMArena Text: Spanish14421321Gemma 4 31B
LMArena Text: Russian14601304Gemma 4 31B
LMArena Text: Polish14331294Gemma 4 31B
LMArena Text: multi-turn14521320Gemma 4 31B
LMArena Text: longer queries14461343Gemma 4 31B
LMArena Text: writing and language14321313Gemma 4 31B
LMArena Text: entertainment and media14051283Gemma 4 31B
LMArena Vision: English1271Not measuredOnly Gemma 4 31B measured
LMArena Vision: Chinese1326Not measuredOnly Gemma 4 31B measured
LMArena Vision: reading text1282Not measuredOnly Gemma 4 31B measured
LMArena Vision: humor1280Not measuredOnly Gemma 4 31B measured
LMArena Vision: captioning1218Not measuredOnly Gemma 4 31B measured
LMArena Vision: recognizing things1226Not measuredOnly Gemma 4 31B measured
LMArena Vision: creative writing1285Not measuredOnly Gemma 4 31B measured
LMArena Document1425Not measuredOnly Gemma 4 31B measured
Neither model has a result on the other 11 boards here
Image generationNot comparablePublic boards, shown as published, kept out of the index0 boards, none shared
Image generation benchmarks for Gemma 4 31B and o3 Mini
BenchmarkGemma 4 31Bo3 MiniLeader
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

Gemma 4 31B$0.0004Fits in one request
o3 Mini$0.0033Fits in one request

Gemma 4 31B costs less

Repository review

50K input + 3K output tokens

Gemma 4 31B$0.011Fits in one request
o3 Mini$0.068Fits in one request

Gemma 4 31B costs less

Agent loop

200K input + 10K output tokens

Gemma 4 31B$0.044Fits in one request
o3 Mini$0.264Exceeds the context window

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 Gemma 4 31B and o3 Mini
SpecificationGoogle Gemma 4 31BOpenAI o3 Mini
MakerGoogleOpenAI
WeightsOpen weightsNo public weights listed
ReleasedApril 2, 2026January 31, 2025
Context window262K200K
Input $/Mtok$0.20$1.10
Output $/Mtok$0.40$4.40
Coding index38.352.1
Independent measurements behind it22
Cost per solved taskNot computableNot computable
SourceOpenRouter listingOpenRouter listing

Questions

Is Gemma 4 31B better than o3 Mini for coding?

Pick o3 Mini for coding: it scores 52.1 on the Vibe Coding Index against 38.3 for Gemma 4 31B. Pick Gemma 4 31B when output tokens cost 11.0x less, or when the context window is larger, 262K against 200K tokens.

Which is cheaper, Gemma 4 31B or o3 Mini?

Gemma 4 31B costs $0.20 per million input tokens and $0.40 per million output tokens; o3 Mini costs $1.10 and $4.40. Cost per solved task is known for neither of them.

Which has the bigger context window, Gemma 4 31B or o3 Mini?

Gemma 4 31B, with 262K tokens against 200K.

How many benchmarks is the Gemma 4 31B vs o3 Mini comparison based on?

40 benchmarks have a result for both models as of October 21, 2026. Gemma 4 31B's coding index rests on 2 independent benchmarks and o3 Mini's on 2. Where only one model has a result, the page says so instead of naming a winner.

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<p style="font:13px/1.4 sans-serif;margin:6px 0 0">Source: <a href="https://llmbenchmark.ai/compare/gemma-4-31b-it-vs-o3-mini">LLMBenchmark.ai, Gemma 4 31B vs o3 Mini</a></p>