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Gemini 3 Flash vs GPT-5.2

The readout for Gemini 3 Flash and GPT-5.2, before the detailed comparison sheet.

Model A

Gemini 3 Flash

Google

Contender
vs

Model B

GPT-5.2

OpenAI

Leading

Key Takeaways

Weighted outcome: GPT-5.2. Benchmark capability categories carry 80%, while price, API performance, and availability carry 20%.

Decision read

GPT-5.2

GPT-5.2 has the higher weighted result; Model A / B score 19.4 to 80.6.

Evidence depth

124 data points

Includes 30 benchmark rows, 0 audit samples, and 10 provider examples.

Selection signal

Start with GPT-5.2

The charts below split 40 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 GPT-5.2: pricing, speed aggregates, third-party benchmark scores, and shared provider samples.

Model compare
Gemini 3 Flash
GPT-5.2
Overall leaderContenderLeading
Weighted overall score19.4 pts80.6 pts
Benchmark category leads1 categories6 categories
Operational advantagesCheapest input price, Average speedFirst-token latency, Free providers, Provider coverage
Context window1.0M tokens400K tokens
Max output65.5K tokens128K tokens
Modalities

Input

TextImageFileAudiovideo

Output

Text

Input

FileImageText

Output

Text
Features
Text inputImage inputFile inputAudio inputText outputTool callingStructured outputsJSON modeReasoning
Text inputImage 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
GPT-5.2
DeveloperGoogleOpenAI
ReleasedDec 2025Dec 2025
ParametersNo dataNo data
TokenizerGeminiGPT
Knowledge cutoffNo dataNo data
OpenRouter IDgoogle/gemini-3-flash-previewopenai/gpt-5.2
ReferencesNo dataNo data

When to choose each model

This report only uses LMSpeed data for Gemini 3 Flash and GPT-5.2: pricing, speed aggregates, third-party benchmark scores, and shared provider samples.

Gemini 3 Flash

Gemini 3 Flash is stronger in benchmark categories (Multimodal) and operational dimensions (Cheapest input price, Average speed).

GPT-5.2

GPT-5.2 is stronger in benchmark categories (Agents, Coding, Reasoning, Knowledge, Math) and operational dimensions (First-token latency, Free providers, Provider coverage).

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
7 / 8
Shared
7 shared categories

Avg. score

Gemini 3 Flash

51.3

Avg. score

GPT-5.2

51.8

Agents

GPT-5.2 leads by 3.9

Gemini 3 Flash43.1
GPT-5.247

Coding

GPT-5.2 leads by 3.6

Gemini 3 Flash52.7
GPT-5.256.3

Reasoning

GPT-5.2 leads by 1.1

Gemini 3 Flash52
GPT-5.253.1

Knowledge

GPT-5.2 leads by 0.7

Gemini 3 Flash53.7
GPT-5.254.4

Math

GPT-5.2 leads by 3.8

Gemini 3 Flash51.5
GPT-5.255.3

Multilingual

Gemini 3 Flash

Gemini 3 Flash58.5
GPT-5.2-

Multimodal

Gemini 3 Flash leads by 8.7

Gemini 3 Flash50.9
GPT-5.242.2

Instruction following

GPT-5.2 leads by 6.7

Gemini 3 Flash47.9
GPT-5.254.6

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

GPT-5.2

51.0

Rank #79/112 · confidence 4 · eval date 2025-12-11

Pricingverified

Input price

SourceGemini 3 Flash Preview (Non-reasoning)

Gemini 3 Flash

winner

$0.500/M

Rank #85/186 · confidence 4

+$1.25/M

GPT-5.2

$1.75/M

Rank #140/186 · confidence 4

Pricingverified

Blended price

SourceGemini 3 Flash Preview (Non-reasoning)

Gemini 3 Flash

winner

$1.13/M

Rank #97/186 · confidence 4

+$3.69/M

GPT-5.2

$4.81/M

Rank #155/186 · confidence 4

Pricingverified

Output price

SourceGemini 3 Flash Preview (Non-reasoning)

Gemini 3 Flash

winner

$3.00/M

Rank #99/186 · confidence 4

+$11.00/M

GPT-5.2

$14.00/M

Rank #156/186 · confidence 4

Reasoningverified

MMLU-Pro

SourceGemini 3 Flash Preview (Non-reasoning)

Gemini 3 Flash

winner

88.2%

Rank #7/129 · confidence 4

+0.8%

GPT-5.2

87.4%

Rank #11/129 · confidence 4

Reasoningreported

AA-LCR

SourceGemini 3 Flash

Gemini 3 Flash

55.3

Rank #83/106 · confidence 3 · eval date 2025-12-01

+27.4

GPT-5.2

winner

82.7

Rank #11/106 · confidence 4 · eval date 2025-12-11

Reasoningreported

CritPt

SourceGemini 3 Flash

Gemini 3 Flash

1.4

Rank #65/88 · confidence 3 · eval date 2025-12-01

+10.2

GPT-5.2

winner

11.6

Rank #31/88 · confidence 4 · eval date 2025-12-11

Reasoningreported

BenchLM Reasoning score

SourceGemini 3 Flash

Gemini 3 Flash

winner

59.0

Rank #50/67 · confidence 3 · eval date 2025-12-01

+5.3

GPT-5.2

53.7

Rank #55/67 · confidence 4 · eval date 2025-12-11

Reasoningverified

GPQA

SourceGemini 3 Flash Preview (Non-reasoning)

Gemini 3 Flash

winner

81.2%

Rank #95/218 · confidence 4

+10.0%

GPT-5.2

71.2%

Rank #138/218 · confidence 4

Reasoningverified

HLE

SourceGemini 3 Flash Preview (Non-reasoning)

Gemini 3 Flash

winner

15.0%

Rank #102/216 · confidence 4

+7.0%

GPT-5.2

8.0%

Rank #134/216 · confidence 4

Codingreported

Vibe Code Bench

SourceGemini 3 Flash

Gemini 3 Flash

20.2

Rank #21/33 · confidence 3 · eval date 2025-12-01

+33.3

GPT-5.2

winner

53.5

Rank #6/33 · confidence 4 · eval date 2025-12-11

Codingreported

BenchLM Coding score

SourceGemini 3 Flash

Gemini 3 Flash

winner

66.7

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

+20.2

GPT-5.2

46.5

Rank #64/87 · confidence 4 · eval date 2025-12-11

Codingverified

LiveCodeBench

SourceGemini 3 Flash Preview (Non-reasoning)

Gemini 3 Flash

winner

79.7%

Rank #19/115 · confidence 4

+12.8%

GPT-5.2

66.9%

Rank #36/115 · confidence 4

Codingreported

AA-SciCode

SourceGemini 3 Flash

Gemini 3 Flash

49.9

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

+2.2

GPT-5.2

winner

52.1

Rank #28/113 · confidence 4 · eval date 2025-12-11

Mathreported

FrontierMath v2 (Tiers 1-3)

SourceGemini 3 Flash

Gemini 3 Flash

35.6

Rank #16/47 · confidence 1 · eval date 2025-12-01

+5.1

GPT-5.2

winner

40.7

Rank #10/47 · confidence 4 · eval date 2025-12-11

Mathreported

FrontierMath v2 (Tier 4)

SourceGemini 3 Flash

Gemini 3 Flash

4.2

Rank #24/36 · confidence 1 · eval date 2025-12-01

+14.6

GPT-5.2

winner

18.8

Rank #12/36 · confidence 4 · eval date 2025-12-11

Mathreported

BenchLM Math score

SourceGemini 3 Flash

Gemini 3 Flash

50.2

Rank #36/63 · confidence 3 · eval date 2025-12-01

+7.3

GPT-5.2

winner

57.5

Rank #31/63 · confidence 4 · eval date 2025-12-11

Knowledgereported

AA-Omniscience Hallucination Rate

SourceGemini 3 Flash

Gemini 3 Flash

winner

92.4

Rank #11/106 · confidence 3 · eval date 2025-12-01

+11.2

GPT-5.2

81.2

Rank #40/106 · confidence 4 · eval date 2025-12-11

Knowledgereported

AA-Omniscience Accuracy

SourceGemini 3 Flash

Gemini 3 Flash

winner

45.8

Rank #23/106 · confidence 3 · eval date 2025-12-01

+1.5

GPT-5.2

44.3

Rank #27/106 · confidence 4 · eval date 2025-12-11

Knowledgereported

BenchLM Knowledge score

SourceGemini 3 Flash

Gemini 3 Flash

76.6

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

+0.6

GPT-5.2

winner

77.2

Rank #23/83 · confidence 4 · eval date 2025-12-11

Knowledgereported

AA-GPQA Diamond

SourceGemini 3 Flash

Gemini 3 Flash

81.2

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

+9.1

GPT-5.2

winner

90.3

Rank #32/113 · confidence 4 · eval date 2025-12-11

Knowledgereported

AA-HLE

SourceGemini 3 Flash

Gemini 3 Flash

15.0

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

+22.7

GPT-5.2

winner

37.7

Rank #33/114 · confidence 4 · eval date 2025-12-11

Knowledgereported

Artificial Analysis Intelligence Index

SourceGemini 3 Flash

Gemini 3 Flash

17.9

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

+12.5

GPT-5.2

winner

30.4

Rank #47/117 · confidence 4 · eval date 2025-12-11

Multimodalreported

BenchLM Multimodal Grounded score

SourceGemini 3 Flash

Gemini 3 Flash

winner

75.8

Rank #19/56 · confidence 3 · eval date 2025-12-01

+9.5

GPT-5.2

66.3

Rank #31/56 · confidence 4 · eval date 2025-12-11

Multimodalreported

Design Arena Website

SourceGemini 3 Flash

Gemini 3 Flash

winner

1210.0

Rank #46/78 · confidence 3 · eval date 2025-12-01

+3.0

GPT-5.2

1207.0

Rank #47/78 · confidence 4 · eval date 2025-12-11

Instruction followingreported

BenchLM Instruction Following score

SourceGemini 3 Flash

Gemini 3 Flash

66.2

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

+26.4

GPT-5.2

winner

92.6

Rank #10/52 · confidence 4 · eval date 2025-12-11

Instruction followingreported

AA-IFBench

SourceGemini 3 Flash

Gemini 3 Flash

55.1

Rank #53/84 · confidence 3 · eval date 2025-12-01

+20.3

GPT-5.2

winner

75.4

Rank #18/84 · confidence 4 · eval date 2025-12-11

Agentsreported

JobBench

SourceGemini 3 Flash

Gemini 3 Flash

11.4

Rank #21/24 · confidence 3 · eval date 2025-12-01

+22.9

GPT-5.2

winner

34.3

Rank #10/24 · confidence 4 · eval date 2025-12-11

Agentsreported

Gert Labs

SourceGemini 3 Flash

Gemini 3 Flash

winner

56.6

Rank #16/49 · confidence 3 · eval date 2025-12-01

+10.1

GPT-5.2

46.5

Rank #28/49 · confidence 4 · eval date 2025-12-11

Agentsreported

τ²-bench results

SourceGemini 3 Flash

Gemini 3 Flash

43.3

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

+41.5

GPT-5.2

winner

84.8

Rank #46/82 · confidence 4 · eval date 2025-12-11

API audit comparison

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

Provider
Gemini 3 Flash
GPT-5.2
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
GPT-5.2
N1N35 tests

Gemini 3 Flash

speed / latency

157 tok/s / 7994ms

input / output

No data

GPT-5.2

speed / latency

56 tok/s / 1798ms

input / output

No data

CatClaw API30 tests

Gemini 3 Flash

speed / latency

129 tok/s / 10293ms

input / output

No data

GPT-5.2

speed / latency

N/A / N/A

input / output

No data

Rnglg2 API15 tests

Gemini 3 Flash

speed / latency

160 tok/s / 6933ms

input / output

No data

GPT-5.2

speed / latency

55 tok/s / 1434ms

input / output

No data

A310 tests

Gemini 3 Flash

speed / latency

162 tok/s / 5569ms

input / output

No data

GPT-5.2

speed / latency

45 tok/s / 1716ms

input / output

No data

Hi API10 tests

Gemini 3 Flash

speed / latency

118 tok/s / 9594ms

input / output

No data

GPT-5.2

speed / latency

N/A / N/A

input / output

No data

180txt API

Gemini 3 Flash

gemini-3-flash

speed / latency

No data

input / output

$0.175/M/$1.05/M

GPT-5.2

gpt-5.2-chat-latest

speed / latency

No data

input / output

$0/M/$0/M

兔子API

Gemini 3 Flash

gemini-3-flash-preview-nothinking

speed / latency

No data

input / output

$0/request

GPT-5.2

gpt-5.2-xhigh

speed / latency

No data

input / output

$0/request

初叶🍂Furry API

Gemini 3 Flash

gemini-3-flash-preview

speed / latency

No data

input / output

$0.100/request

GPT-5.2

gpt-5-2

speed / latency

No data

input / output

$0/request

Yun API

Gemini 3 Flash

gemini-3-flash

speed / latency

No data

input / output

$0.034/M/$0.205/M

GPT-5.2

gpt-5.2

speed / latency

No data

input / output

$0.0014/request

PoloAPI

Gemini 3 Flash

gemini-3-flash-preview-c

speed / latency

No data

input / output

$0.0027/request

GPT-5.2

gpt-5.2-chat-2025-12-11

speed / latency

No data

input / output

$0.192/M/$1.53/M

FAQ

Weighted outcome: GPT-5.2. 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.