Sponsored byFusecodeEnterprise coding API for Claude Code, Codex, and model workflows.
LogoLMSpeed
Back to models

Model compare

GPT-5.1 vs O3 Mini

The readout for GPT-5.1 and O3 Mini, before the detailed comparison sheet.

Model A

GPT-5.1

OpenAI

Leading
vs

Model B

O3 Mini

OpenAI

Contender

Key Takeaways

Weighted outcome: GPT-5.1. Benchmark capability categories carry 80%, while price, API performance, and availability carry 20%.

Decision read

GPT-5.1

GPT-5.1 has the higher weighted result; Model A / B score 69.3 to 30.7.

Evidence depth

93 data points

Includes 14 benchmark rows, 0 audit samples, and 10 provider examples.

Selection signal

Start with GPT-5.1

The charts below split 24 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 GPT-5.1 and O3 Mini: pricing, speed aggregates, third-party benchmark scores, and shared provider samples.

Model compare
GPT-5.1
O3 Mini
Overall leaderLeadingContender
Weighted overall score69.3 pts30.7 pts
Benchmark category leads4 categories2 categories
Operational advantagesAverage speed, First-token latency, Free providers, Provider coverageCheapest input price
Context window400K tokens200K tokens
Max output128K tokens100K tokens
Modalities

Input

ImageTextFile

Output

Text

Input

TextFile

Output

Text
Features
Text inputImage inputFile 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
GPT-5.1
O3 Mini
DeveloperOpenAIOpenAI
ReleasedNov 2025Feb 2025
ParametersNo dataNo data
TokenizerGPTGPT
Knowledge cutoffNo data2023-10-31
OpenRouter IDopenai/gpt-5.1openai/o3-mini
ReferencesNo dataNo data

When to choose each model

This report only uses LMSpeed data for GPT-5.1 and O3 Mini: pricing, speed aggregates, third-party benchmark scores, and shared provider samples.

GPT-5.1

GPT-5.1 is stronger in benchmark categories (Agents, Coding, Reasoning, Knowledge) and operational dimensions (Average speed, First-token latency, Free providers, Provider coverage).

O3 Mini

O3 Mini is stronger in benchmark categories (Math, Instruction following) and operational dimensions (Cheapest input price).

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

GPT-5.1

51.9

Avg. score

O3 Mini

48.6

Agents

GPT-5.1 leads by 8.0

GPT-5.147.7
O3 Mini39.7

Coding

GPT-5.1 leads by 8.6

GPT-5.149.1
O3 Mini40.5

Reasoning

GPT-5.1 leads by 4.6

GPT-5.154
O3 Mini49.4

Knowledge

GPT-5.1 leads by 5.2

GPT-5.153
O3 Mini47.8

Math

O3 Mini leads by 4.5

GPT-5.154
O3 Mini58.5

Multilingual

No data

GPT-5.1-
O3 Mini-

Multimodal

No data

GPT-5.1-
O3 Mini-

Instruction following

O3 Mini leads by 2.1

GPT-5.153.5
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

SourceGPT-5.1

GPT-5.1

winner

56.0

Rank #50/100 · confidence 1 · eval date 2025-11-13

+5.0

O3 Mini

51.0

Rank #67/100 · confidence 1 · eval date 2025-01-31

Pricingverified

Input price

SourceGPT-5.1 (high)

GPT-5.1

$1.25/M

Rank #119/180 · confidence 4

+$0.150/M

O3 Mini

winner

$1.10/M

Rank #114/180 · confidence 4

Pricingverified

Blended price

SourceGPT-5.1 (high)

GPT-5.1

$3.44/M

Rank #135/180 · confidence 4

+$1.51/M

O3 Mini

winner

$1.93/M

Rank #115/180 · confidence 4

Pricingverified

Output price

SourceGPT-5.1 (high)

GPT-5.1

$10.00/M

Rank #138/180 · confidence 4

+$5.60/M

O3 Mini

winner

$4.40/M

Rank #115/180 · confidence 4

Reasoningverified

GPQA

SourceGPT-5.1 (high)

GPT-5.1

winner

87.3%

Rank #48/212 · confidence 4

+12.5%

O3 Mini

74.8%

Rank #117/212 · confidence 4

Reasoningverified

HLE

SourceGPT-5.1 (high)

GPT-5.1

winner

28.5%

Rank #56/209 · confidence 4

+20.6%

O3 Mini

7.9%

Rank #128/209 · confidence 4

Reasoningverified

MMLU-Pro

SourceGPT-5.1 (Non-reasoning)

GPT-5.1

winner

80.1%

Rank #62/129 · confidence 4

+1.0%

O3 Mini

79.1%

Rank #70/129 · confidence 4

Codingverified

LiveCodeBench

SourceGPT-5.1 (high)

GPT-5.1

winner

86.8%

Rank #4/115 · confidence 4

+15.1%

O3 Mini

71.7%

Rank #27/115 · confidence 4

Codingreported

AA-SciCode

SourceGPT-5.1

GPT-5.1

winner

43.3

Rank #55/108 · confidence 1 · eval date 2025-11-13

+3.4

O3 Mini

39.9

Rank #70/108 · confidence 1 · eval date 2025-01-31

Codingverified

SciCode

SourceGPT-5.1 (high)

GPT-5.1

winner

43.3%

Rank #56/205 · confidence 4

+3.4%

O3 Mini

39.9%

Rank #86/205 · confidence 4

Knowledgereported

AA-GPQA Diamond

SourceGPT-5.1

GPT-5.1

winner

87.3

Rank #44/108 · confidence 1 · eval date 2025-11-13

+12.5

O3 Mini

74.8

Rank #82/108 · confidence 1 · eval date 2025-01-31

Knowledgereported

AA-HLE

SourceGPT-5.1

GPT-5.1

winner

28.5

Rank #47/108 · confidence 1 · eval date 2025-11-13

+20.6

O3 Mini

7.9

Rank #83/108 · confidence 1 · eval date 2025-01-31

Knowledgereported

Artificial Analysis Intelligence Index

SourceGPT-5.1

GPT-5.1

winner

37.5

Rank #52/111 · confidence 1 · eval date 2025-11-13

+18.3

O3 Mini

19.2

Rank #87/111 · confidence 1 · eval date 2025-01-31

Agentsreported

τ²-bench results

SourceGPT-5.1

GPT-5.1

winner

81.9

Rank #53/82 · confidence 1 · eval date 2025-11-13

+53.2

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
GPT-5.1
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
GPT-5.1
O3 Mini
BUZZ10 tests

GPT-5.1

speed / latency

137 tok/s / 3299ms

input / output

No data

O3 Mini

speed / latency

N/A / N/A

input / output

No data

N1N10 tests

GPT-5.1

speed / latency

96 tok/s / 1862ms

input / output

No data

O3 Mini

speed / latency

117 tok/s / 4809ms

input / output

No data

ZetaTechs API6 tests

GPT-5.1

speed / latency

N/A / N/A

input / output

No data

O3 Mini

speed / latency

44 tok/s / 17418ms

input / output

No data

42公益站0 tests

GPT-5.1

speed / latency

N/A / N/A

input / output

No data

O3 Mini

speed / latency

N/A / N/A

input / output

No data

AAAI0 tests

GPT-5.1

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

GPT-5.1

gpt-5.1-chat-latest

speed / latency

No data

input / output

$0/request

O3 Mini

o3-mini

speed / latency

No data

input / output

$0/request

Yun API

GPT-5.1

gpt-5.1

speed / latency

No data

input / output

$0.0027/request

O3 Mini

o3-mini

speed / latency

No data

input / output

$0.151/M/$0.603/M

KKSJ-AI

GPT-5.1

gpt-5.1-2025-11-13

speed / latency

No data

input / output

$0.154/M/$1.23/M

O3 Mini

o3-mini-all

speed / latency

No data

input / output

$0.0062/request

KFCV50

GPT-5.1

gpt-5.1

speed / latency

No data

input / output

$0.0068/request

O3 Mini

o3-mini-2025-01-31

speed / latency

No data

input / output

$0.075/M/$0.301/M

Newagiai

GPT-5.1

gpt-5.1-all

speed / latency

No data

input / output

$0.137/M/$1.10/M

O3 Mini

o3-mini-high-all

speed / latency

No data

input / output

$0.011/request

FAQ

Weighted outcome: GPT-5.1. 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.