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Gemini 3 Flash vs O3 Mini

The readout for Gemini 3 Flash and O3 Mini, before the detailed comparison sheet.

Model A

Gemini 3 Flash

Google

Leading
vs

Model B

O3 Mini

OpenAI

Contender

Key Takeaways

Weighted outcome: Gemini 3 Flash. Benchmark capability categories carry 80%, while price, API performance, and availability carry 20%.

Decision read

Gemini 3 Flash

Gemini 3 Flash has the higher weighted result; Model A / B score 69.3 to 30.7.

Evidence depth

97 data points

Includes 16 benchmark rows, 0 audit samples, and 10 provider examples.

Selection signal

Start with Gemini 3 Flash

The charts below split 26 high-signal samples across speed, scores, and audit health.

Change comparison

Switch either side of this report to compare another model with the same LMSpeed data pipeline.

Select a different model to open a new comparison URL.

Comparison sheet

This report only uses LMSpeed data for Gemini 3 Flash and O3 Mini: pricing, speed aggregates, third-party benchmark scores, and shared provider samples.

Model compare
Gemini 3 Flash
O3 Mini
Overall leaderLeadingContender
Weighted overall score69.3 pts30.7 pts
Benchmark category leads4 categories2 categories
Operational advantagesCheapest input price, Average speed, Free providers, Provider coverageFirst-token latency
Context window1.0M tokens200K tokens
Max output65.5K tokens100K tokens
Modalities

Input

TextImageFileAudiovideo

Output

Text

Input

TextFile

Output

Text
Features
Text inputImage inputFile inputAudio inputText outputTool callingStructured outputsJSON modeReasoning
Text inputFile inputText outputTool callingStructured outputsJSON modeReasoning

The overall result weights benchmark capability categories at 80% and price, API speed/latency, and availability at 20%. Recent test volume does not affect the winner, and missing benchmark categories are excluded.

Model metadata

Model compare
Gemini 3 Flash
O3 Mini
DeveloperGoogleOpenAI
ReleasedDec 2025Feb 2025
ParametersNo dataNo data
TokenizerGeminiGPT
Knowledge cutoffNo data2023-10-31
OpenRouter IDgoogle/gemini-3-flash-previewopenai/o3-mini
ReferencesNo dataNo data

When to choose each model

This report only uses LMSpeed data for Gemini 3 Flash and O3 Mini: pricing, speed aggregates, third-party benchmark scores, and shared provider samples.

Gemini 3 Flash

Gemini 3 Flash is stronger in benchmark categories (Agents, Coding, Reasoning, Knowledge) and operational dimensions (Cheapest input price, Average speed, Free providers, Provider coverage).

O3 Mini

O3 Mini is stronger in benchmark categories (Math, Instruction following) and operational dimensions (First-token latency).

Benchmark score comparison

Third-party benchmark profile synced into LMSpeed; only metrics available for both models are shown.

Category performance

Compare benchmark category scores on a 0-100 scale. Select a category to inspect the gap.

Model A coverage
8 / 8
Model B coverage
6 / 8
Shared
6 shared categories

Avg. score

Gemini 3 Flash

51.3

Avg. score

O3 Mini

48.3

Agents

Gemini 3 Flash leads by 3.7

Gemini 3 Flash43.1
O3 Mini39.4

Coding

Gemini 3 Flash leads by 13.5

Gemini 3 Flash52.7
O3 Mini39.2

Reasoning

Gemini 3 Flash leads by 2.7

Gemini 3 Flash52
O3 Mini49.3

Knowledge

Gemini 3 Flash leads by 5.9

Gemini 3 Flash53.7
O3 Mini47.8

Math

O3 Mini leads by 7.0

Gemini 3 Flash51.5
O3 Mini58.5

Multilingual

Gemini 3 Flash

Gemini 3 Flash58.5
O3 Mini-

Multimodal

Gemini 3 Flash

Gemini 3 Flash50.9
O3 Mini-

Instruction following

O3 Mini leads by 7.7

Gemini 3 Flash47.9
O3 Mini55.6

Professional benchmark details

Metric-level scores with benchmark source, rank depth, confidence, error, and evaluation date where available.

Aggregatereported

BenchLM overall score

SourceGemini 3 Flash

Gemini 3 Flash

winner

65.0

Rank #38/112 · confidence 3 · eval date 2025-12-01

+14.0

O3 Mini

51.0

Rank #79/112 · confidence 1 · eval date 2025-01-31

Pricingverified

Input price

SourceGemini 3 Flash Preview (Non-reasoning)

Gemini 3 Flash

winner

$0.500/M

Rank #85/186 · confidence 4

+$0.600/M

O3 Mini

$1.10/M

Rank #117/186 · confidence 4

Pricingverified

Blended price

SourceGemini 3 Flash Preview (Non-reasoning)

Gemini 3 Flash

winner

$1.13/M

Rank #97/186 · confidence 4

+$0.800/M

O3 Mini

$1.93/M

Rank #118/186 · confidence 4

Pricingverified

Output price

SourceGemini 3 Flash Preview (Non-reasoning)

Gemini 3 Flash

winner

$3.00/M

Rank #99/186 · confidence 4

+$1.40/M

O3 Mini

$4.40/M

Rank #119/186 · confidence 4

Reasoningverified

MMLU-Pro

SourceGemini 3 Flash Preview (Non-reasoning)

Gemini 3 Flash

winner

88.2%

Rank #7/129 · confidence 4

+9.1%

O3 Mini

79.1%

Rank #70/129 · confidence 4

Reasoningverified

GPQA

SourceGemini 3 Flash Preview (Non-reasoning)

Gemini 3 Flash

winner

81.2%

Rank #95/218 · confidence 4

+6.4%

O3 Mini

74.8%

Rank #122/218 · confidence 4

Reasoningverified

HLE

SourceGemini 3 Flash Preview (Non-reasoning)

Gemini 3 Flash

winner

15.0%

Rank #102/216 · confidence 4

+7.1%

O3 Mini

7.9%

Rank #135/216 · confidence 4

Codingreported

BenchLM Coding score

SourceGemini 3 Flash

Gemini 3 Flash

winner

66.7

Rank #16/87 · confidence 3 · eval date 2025-12-01

+45.4

O3 Mini

21.3

Rank #86/87 · confidence 1 · eval date 2025-01-31

Codingverified

LiveCodeBench

SourceGemini 3 Flash Preview (Non-reasoning)

Gemini 3 Flash

winner

79.7%

Rank #19/115 · confidence 4

+8.0%

O3 Mini

71.7%

Rank #27/115 · confidence 4

Codingreported

AA-SciCode

SourceGemini 3 Flash

Gemini 3 Flash

winner

49.9

Rank #36/113 · confidence 1 · eval date 2025-12-01

+10.0

O3 Mini

39.9

Rank #76/113 · confidence 1 · eval date 2025-01-31

Knowledgereported

BenchLM Knowledge score

SourceGemini 3 Flash

Gemini 3 Flash

winner

76.6

Rank #25/83 · confidence 3 · eval date 2025-12-01

+11.0

O3 Mini

65.6

Rank #48/83 · confidence 1 · eval date 2025-01-31

Knowledgereported

AA-GPQA Diamond

SourceGemini 3 Flash

Gemini 3 Flash

winner

81.2

Rank #75/113 · confidence 3 · eval date 2025-12-01

+6.4

O3 Mini

74.8

Rank #87/113 · confidence 1 · eval date 2025-01-31

Knowledgereported

AA-HLE

SourceGemini 3 Flash

Gemini 3 Flash

winner

15.0

Rank #79/114 · confidence 3 · eval date 2025-12-01

+7.1

O3 Mini

7.9

Rank #89/114 · confidence 1 · eval date 2025-01-31

Knowledgereported

Artificial Analysis Intelligence Index

SourceGemini 3 Flash

Gemini 3 Flash

17.9

Rank #92/117 · confidence 3 · eval date 2025-12-01

+1.3

O3 Mini

winner

19.2

Rank #87/117 · confidence 1 · eval date 2025-01-31

Instruction followingreported

BenchLM Instruction Following score

SourceGemini 3 Flash

Gemini 3 Flash

66.2

Rank #46/52 · confidence 3 · eval date 2025-12-01

+24.8

O3 Mini

winner

91.0

Rank #14/52 · confidence 1 · eval date 2025-01-31

Agentsreported

τ²-bench results

SourceGemini 3 Flash

Gemini 3 Flash

winner

43.3

Rank #69/82 · confidence 3 · eval date 2025-12-01

+14.6

O3 Mini

28.7

Rank #72/82 · confidence 1 · eval date 2025-01-31

API audit comparison

Latest completed audits from shared providers, with four safety and integrity score groups plus report links.

Provider
Gemini 3 Flash
O3 Mini
No completed audits are available from shared providers yet.

Provider examples

Speed aggregates and input/output pricing share each provider row for real API selection and migration cost checks.

Provider
Gemini 3 Flash
O3 Mini
N1N25 tests

Gemini 3 Flash

speed / latency

157 tok/s / 7994ms

input / output

No data

O3 Mini

speed / latency

117 tok/s / 4809ms

input / output

No data

丸美小沐25 tests

Gemini 3 Flash

speed / latency

N/A / N/A

input / output

No data

O3 Mini

speed / latency

66 tok/s / 6491ms

input / output

No data

Rnglg2 API10 tests

Gemini 3 Flash

speed / latency

160 tok/s / 6933ms

input / output

No data

O3 Mini

speed / latency

N/A / N/A

input / output

No data

Seamee API10 tests

Gemini 3 Flash

speed / latency

155 tok/s / 6071ms

input / output

No data

O3 Mini

speed / latency

N/A / N/A

input / output

No data

ZetaTechs API6 tests

Gemini 3 Flash

speed / latency

N/A / N/A

input / output

No data

O3 Mini

speed / latency

44 tok/s / 17418ms

input / output

No data

兔子API

Gemini 3 Flash

gemini-3-flash-preview-nothinking

speed / latency

No data

input / output

$0/request

O3 Mini

o3-mini-2025-01-31-low

speed / latency

No data

input / output

$0/request

PoloAPI

Gemini 3 Flash

gemini-3-flash-preview-c

speed / latency

No data

input / output

$0.0027/request

O3 Mini

o3-mini-all

speed / latency

No data

input / output

$0.0095/request

碳硅生命体

Gemini 3 Flash

gemini-3-flash-c

speed / latency

No data

input / output

$0.0030/request

O3 Mini

o3-mini

speed / latency

No data

input / output

$300.00/M/$1200.00/M

Newagiai

Gemini 3 Flash

gemini-3-flash-preview

speed / latency

No data

input / output

$0.068/M/$0.411/M

O3 Mini

o3-mini-all

speed / latency

No data

input / output

$0.0033/request

柏拉图AI

Gemini 3 Flash

gemini-3-flash-preview

speed / latency

No data

input / output

$0.068/M/$0.411/M

O3 Mini

o3-mini-all

speed / latency

No data

input / output

$0.0033/request

FAQ

Weighted outcome: Gemini 3 Flash. Benchmark capability categories carry 80%, while price, API performance, and availability carry 20%.

Why is this comparison indexable?
It has 6 verifiable comparison points, and both models have pricing or benchmark data.
Are missing metrics invented?
No. Metrics without LMSpeed data are omitted from this report.

Rankings are based on community-submitted tests and periodic health probes. Advisory only, not official data.