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Gemini 2.5 Flash vs O3 Mini

The readout for Gemini 2.5 Flash and O3 Mini, before the detailed comparison sheet.

Model A

Gemini 2.5 Flash

Google

Contender
vs

Model B

O3 Mini

OpenAI

Leading

Key Takeaways

Weighted outcome: O3 Mini. Benchmark capability categories carry 80%, while price, API performance, and availability carry 20%.

Decision read

O3 Mini

O3 Mini has the higher weighted result; Model A / B score 29.3 to 70.7.

Evidence depth

96 data points

Includes 15 benchmark rows, 0 audit samples, and 10 provider examples.

Selection signal

Start with O3 Mini

The charts below split 25 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 2.5 Flash and O3 Mini: pricing, speed aggregates, third-party benchmark scores, and shared provider samples.

Model compare
Gemini 2.5 Flash
O3 Mini
Overall leaderContenderLeading
Weighted overall score29.3 pts70.7 pts
Benchmark category leads1 categories5 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

FileImageTextAudiovideo

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 2.5 Flash
O3 Mini
DeveloperGoogleOpenAI
ReleasedJun 2025Feb 2025
ParametersNo dataNo data
TokenizerGeminiGPT
Knowledge cutoff2025-01-312023-10-31
OpenRouter IDgoogle/gemini-2.5-flashopenai/o3-mini
ReferencesNo dataNo data

When to choose each model

This report only uses LMSpeed data for Gemini 2.5 Flash and O3 Mini: pricing, speed aggregates, third-party benchmark scores, and shared provider samples.

Gemini 2.5 Flash

Gemini 2.5 Flash is stronger in benchmark categories (Coding) and operational dimensions (Cheapest input price, Average speed, Free providers, Provider coverage).

O3 Mini

O3 Mini is stronger in benchmark categories (Agents, Reasoning, Knowledge, 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
6 / 8
Model B coverage
6 / 8
Shared
6 shared categories

Avg. score

Gemini 2.5 Flash

43.8

Avg. score

O3 Mini

48.3

Agents

O3 Mini leads by 3.5

Gemini 2.5 Flash35.9
O3 Mini39.4

Coding

Gemini 2.5 Flash leads by 4.4

Gemini 2.5 Flash43.6
O3 Mini39.2

Reasoning

O3 Mini leads by 0.7

Gemini 2.5 Flash48.6
O3 Mini49.3

Knowledge

O3 Mini leads by 7.1

Gemini 2.5 Flash40.7
O3 Mini47.8

Math

O3 Mini leads by 7.9

Gemini 2.5 Flash50.6
O3 Mini58.5

Multilingual

No data

Gemini 2.5 Flash-
O3 Mini-

Multimodal

No data

Gemini 2.5 Flash-
O3 Mini-

Instruction following

O3 Mini leads by 12.4

Gemini 2.5 Flash43.2
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 2.5 Flash

Gemini 2.5 Flash

45.0

Rank #95/112 · confidence 1 · eval date 2025-06-17

+6.0

O3 Mini

winner

51.0

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

Pricingverified

Input price

SourceGemini 2.5 Flash (Reasoning)

Gemini 2.5 Flash

winner

$0.300/M

Rank #55/186 · confidence 4

+$0.800/M

O3 Mini

$1.10/M

Rank #117/186 · confidence 4

Pricingverified

Blended price

SourceGemini 2.5 Flash (Reasoning)

Gemini 2.5 Flash

winner

$0.850/M

Rank #82/186 · confidence 4

+$1.08/M

O3 Mini

$1.93/M

Rank #118/186 · confidence 4

Pricingverified

Output price

SourceGemini 2.5 Flash (Reasoning)

Gemini 2.5 Flash

winner

$2.50/M

Rank #89/186 · confidence 4

+$1.90/M

O3 Mini

$4.40/M

Rank #119/186 · confidence 4

Reasoningverified

MMLU-Pro

SourceGemini 2.5 Flash (Reasoning)

Gemini 2.5 Flash

winner

83.2%

Rank #42/129 · confidence 4

+4.1%

O3 Mini

79.1%

Rank #70/129 · confidence 4

Reasoningverified

GPQA

SourceGemini 2.5 Flash (Reasoning)

Gemini 2.5 Flash

winner

79.0%

Rank #100/218 · confidence 4

+4.2%

O3 Mini

74.8%

Rank #122/218 · confidence 4

Reasoningverified

HLE

SourceGemini 2.5 Flash (Reasoning)

Gemini 2.5 Flash

winner

12.1%

Rank #113/216 · confidence 4

+4.2%

O3 Mini

7.9%

Rank #135/216 · confidence 4

Codingverified

LiveCodeBench

SourceGemini 2.5 Flash (Reasoning)

Gemini 2.5 Flash

69.5%

Rank #30/115 · confidence 4

+2.2%

O3 Mini

winner

71.7%

Rank #27/115 · confidence 4

Codingreported

AA-SciCode

SourceGemini 2.5 Flash

Gemini 2.5 Flash

29.1

Rank #104/113 · confidence 1 · eval date 2025-06-17

+10.8

O3 Mini

winner

39.9

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

Mathverified

MATH-500

SourceGemini 2.5 Flash (Reasoning)

Gemini 2.5 Flash

winner

98.1%

Rank #7/73 · confidence 4

+0.8%

O3 Mini

97.3%

Rank #11/73 · confidence 4

Mathverified

AIME

SourceGemini 2.5 Flash (Reasoning)

Gemini 2.5 Flash

winner

82.3%

Rank #11/68 · confidence 4

+5.3%

O3 Mini

77.0%

Rank #14/68 · confidence 4

Knowledgereported

AA-GPQA Diamond

SourceGemini 2.5 Flash

Gemini 2.5 Flash

68.3

Rank #92/113 · confidence 1 · eval date 2025-06-17

+6.5

O3 Mini

winner

74.8

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

Knowledgereported

Artificial Analysis Intelligence Index

SourceGemini 2.5 Flash

Gemini 2.5 Flash

14.2

Rank #102/117 · confidence 1 · eval date 2025-06-17

+5.0

O3 Mini

winner

19.2

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

Knowledgereported

AA-HLE

SourceGemini 2.5 Flash

Gemini 2.5 Flash

4.7

Rank #98/114 · confidence 1 · eval date 2025-06-17

+3.2

O3 Mini

winner

7.9

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

Agentsreported

τ²-bench results

SourceGemini 2.5 Flash

Gemini 2.5 Flash

14.9

Rank #82/82 · confidence 1 · eval date 2025-06-17

+13.8

O3 Mini

winner

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 2.5 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 2.5 Flash
O3 Mini
N1N10 tests

Gemini 2.5 Flash

speed / latency

200 tok/s / 8207ms

input / output

No data

O3 Mini

speed / latency

117 tok/s / 4809ms

input / output

No data

OpenRouter10 tests

Gemini 2.5 Flash

speed / latency

141 tok/s / 2052ms

input / output

No data

O3 Mini

speed / latency

N/A / N/A

input / output

No data

ZetaTechs API6 tests

Gemini 2.5 Flash

speed / latency

N/A / N/A

input / output

No data

O3 Mini

speed / latency

44 tok/s / 17418ms

input / output

No data

Rnglg2 API5 tests

Gemini 2.5 Flash

speed / latency

189 tok/s / 11433ms

input / output

No data

O3 Mini

speed / latency

N/A / N/A

input / output

No data

9527 API0 tests

Gemini 2.5 Flash

speed / latency

N/A / N/A

input / output

No data

O3 Mini

speed / latency

N/A / N/A

input / output

No data

兔子API

Gemini 2.5 Flash

gemini-2.5-flash-preview-05-20

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 2.5 Flash

gemini-2.5-flash-c

speed / latency

No data

input / output

$0.0027/request

O3 Mini

o3-mini-all

speed / latency

No data

input / output

$0.0095/request

Newagiai

Gemini 2.5 Flash

gemini-2.5-flash

speed / latency

No data

input / output

$0.082/M/$0.685/M

O3 Mini

o3-mini-all

speed / latency

No data

input / output

$0.0033/request

柏拉图AI

Gemini 2.5 Flash

gemini-2.5-flash-preview-05-20

speed / latency

No data

input / output

$0.082/M/$0.685/M

O3 Mini

o3-mini-all

speed / latency

No data

input / output

$0.0033/request

KKSJ-AI

Gemini 2.5 Flash

gemini-2.5-flash

speed / latency

No data

input / output

$0.123/M/$1.03/M

O3 Mini

o3-mini-all

speed / latency

No data

input / output

$0.0062/request

FAQ

Weighted outcome: O3 Mini. 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.