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Model compare

GPT-5.1 vs GPT-5.4 Mini

The readout for GPT-5.1 and GPT-5.4 Mini, before the detailed comparison sheet.

Model A

GPT-5.1

OpenAI

Contender
vs

Model B

GPT-5.4 Mini

OpenAI

Leading

Key Takeaways

Weighted outcome: GPT-5.4 Mini. Benchmark capability categories carry 80%, while price, API performance, and availability carry 20%.

Decision read

GPT-5.4 Mini

GPT-5.4 Mini has the higher weighted result; Model A / B score 42.3 to 57.7.

Evidence depth

123 data points

Includes 29 benchmark rows, 0 audit samples, and 10 provider examples.

Selection signal

Start with GPT-5.4 Mini

The charts below split 39 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 GPT-5.4 Mini: pricing, speed aggregates, third-party benchmark scores, and shared provider samples.

Model compare
GPT-5.1
GPT-5.4 Mini
Overall leaderContenderLeading
Weighted overall score42.3 pts57.7 pts
Benchmark category leads3 categories4 categories
Operational advantagesAverage speed, First-token latencyCheapest input price, Free providers, Provider coverage
Context window400K tokens400K tokens
Max output128K tokens128K tokens
Modalities

Input

ImageTextFile

Output

Text

Input

FileImageText

Output

Text
Features
Text inputImage inputFile 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
GPT-5.1
GPT-5.4 Mini
DeveloperOpenAIOpenAI
ReleasedNov 2025Mar 2026
ParametersNo dataNo data
TokenizerGPTGPT
Knowledge cutoffNo data2025-08-31
OpenRouter IDopenai/gpt-5.1openai/gpt-5.4-mini
ReferencesNo dataNo data

When to choose each model

This report only uses LMSpeed data for GPT-5.1 and GPT-5.4 Mini: pricing, speed aggregates, third-party benchmark scores, and shared provider samples.

GPT-5.1

GPT-5.1 is stronger in benchmark categories (Knowledge, Math, Multimodal) and operational dimensions (Average speed, First-token latency).

GPT-5.4 Mini

GPT-5.4 Mini is stronger in benchmark categories (Agents, Coding, Reasoning, Instruction following) and operational dimensions (Cheapest input price, 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
7 / 8
Model B coverage
7 / 8
Shared
7 shared categories

Avg. score

GPT-5.1

51.2

Avg. score

GPT-5.4 Mini

50.9

Agents

GPT-5.4 Mini leads by 2.6

GPT-5.147.6
GPT-5.4 Mini50.2

Coding

GPT-5.4 Mini leads by 6.1

GPT-5.149.5
GPT-5.4 Mini55.6

Reasoning

GPT-5.4 Mini leads by 1.4

GPT-5.153.8
GPT-5.4 Mini55.2

Knowledge

GPT-5.1 leads by 6.3

GPT-5.151.7
GPT-5.4 Mini45.4

Math

GPT-5.1 leads by 4.1

GPT-5.153.4
GPT-5.4 Mini49.3

Multilingual

No data

GPT-5.1-
GPT-5.4 Mini-

Multimodal

GPT-5.1 leads by 1.7

GPT-5.148.8
GPT-5.4 Mini47.1

Instruction following

GPT-5.4 Mini leads by 0.2

GPT-5.153.5
GPT-5.4 Mini53.7

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

67.0

Rank #28/110 · confidence 3 · eval date 2025-11-13

+7.0

GPT-5.4 Mini

60.0

Rank #45/110 · confidence 4 · eval date 2026-03-17

Pricingverified

Input price

SourceGPT-5.1 (high)

GPT-5.1

$1.25/M

Rank #122/185 · confidence 4

+$0.500/M

GPT-5.4 Mini

winner

$0.750/M

Rank #105/185 · confidence 4

Pricingverified

Blended price

SourceGPT-5.1 (high)

GPT-5.1

$3.44/M

Rank #138/185 · confidence 4

+$1.75/M

GPT-5.4 Mini

winner

$1.69/M

Rank #112/185 · confidence 4

Pricingverified

Output price

SourceGPT-5.1 (high)

GPT-5.1

$10.00/M

Rank #141/185 · confidence 4

+$5.50/M

GPT-5.4 Mini

winner

$4.50/M

Rank #124/185 · confidence 4

Reasoningreported

BenchLM Reasoning score

SourceGPT-5.1

GPT-5.1

winner

76.2

Rank #18/65 · confidence 3 · eval date 2025-11-13

+2.7

GPT-5.4 Mini

73.5

Rank #30/65 · confidence 4 · eval date 2026-03-17

Reasoningreported

AA-LCR

SourceGPT-5.1

GPT-5.1

winner

76.7

Rank #24/106 · confidence 3 · eval date 2025-11-13

+3.7

GPT-5.4 Mini

73.0

Rank #45/106 · confidence 4 · eval date 2026-03-17

Reasoningreported

CritPt

SourceGPT-5.1

GPT-5.1

4.9

Rank #48/88 · confidence 3 · eval date 2025-11-13

+5.1

GPT-5.4 Mini

winner

10.0

Rank #33/88 · confidence 4 · eval date 2026-03-17

Reasoningverified

GPQA

SourceGPT-5.1 (high)

GPT-5.1

winner

87.3%

Rank #52/217 · confidence 4

+5.0%

GPT-5.4 Mini

82.3%

Rank #86/217 · confidence 4

Reasoningverified

HLE

SourceGPT-5.1 (high)

GPT-5.1

winner

28.5%

Rank #60/214 · confidence 4

+9.9%

GPT-5.4 Mini

18.6%

Rank #89/214 · confidence 4

Codingreported

Vibe Code Bench

SourceGPT-5.1

GPT-5.1

24.6

Rank #18/33 · confidence 3 · eval date 2025-11-13

+23.4

GPT-5.4 Mini

winner

48.0

Rank #10/33 · confidence 4 · eval date 2026-03-17

Codingreported

AA-SciCode

SourceGPT-5.1

GPT-5.1

43.3

Rank #60/113 · confidence 3 · eval date 2025-11-13

+6.6

GPT-5.4 Mini

winner

49.9

Rank #33/113 · confidence 4 · eval date 2026-03-17

Codingreported

AA Coding Index

SourceGPT-5.1

GPT-5.1

49.4

Rank #47/75 · confidence 3 · eval date 2025-11-13

+6.7

GPT-5.4 Mini

winner

56.1

Rank #36/75 · confidence 4 · eval date 2026-03-17

Mathreported

FrontierMath v2 (Tier 4)

SourceGPT-5.1

GPT-5.1

winner

12.5

Rank #17/36 · confidence 3 · eval date 2025-11-13

+10.4

GPT-5.4 Mini

2.1

Rank #36/36 · confidence 4 · eval date 2026-03-17

Mathreported

FrontierMath v2 (Tiers 1-3)

SourceGPT-5.1

GPT-5.1

winner

31.0

Rank #19/47 · confidence 3 · eval date 2025-11-13

+2.8

GPT-5.4 Mini

28.3

Rank #20/47 · confidence 4 · eval date 2026-03-17

Mathreported

BenchLM Math score

SourceGPT-5.1

GPT-5.1

winner

49.2

Rank #37/63 · confidence 3 · eval date 2025-11-13

+4.7

GPT-5.4 Mini

44.5

Rank #39/63 · confidence 4 · eval date 2026-03-17

Knowledgereported

AA-Omniscience Hallucination Rate

SourceGPT-5.1

GPT-5.1

51.9

Rank #74/106 · confidence 3 · eval date 2025-11-13

+38.3

GPT-5.4 Mini

winner

90.2

Rank #18/106 · confidence 4 · eval date 2026-03-17

Knowledgereported

AA-Omniscience Accuracy

SourceGPT-5.1

GPT-5.1

winner

37.7

Rank #43/106 · confidence 3 · eval date 2025-11-13

+0.2

GPT-5.4 Mini

37.5

Rank #44/106 · confidence 4 · eval date 2026-03-17

Knowledgereported

Artificial Analysis Intelligence Index

SourceGPT-5.1

GPT-5.1

37.5

Rank #58/117 · confidence 3 · eval date 2025-11-13

+3.5

GPT-5.4 Mini

winner

40.9

Rank #46/117 · confidence 4 · eval date 2026-03-17

Knowledgereported

AA-GPQA Diamond

SourceGPT-5.1

GPT-5.1

87.3

Rank #49/113 · confidence 3 · eval date 2025-11-13

+0.2

GPT-5.4 Mini

winner

87.5

Rank #47/113 · confidence 4 · eval date 2026-03-17

Knowledgereported

BenchLM Knowledge score

SourceGPT-5.1

GPT-5.1

winner

64.4

Rank #52/82 · confidence 3 · eval date 2025-11-13

+7.4

GPT-5.4 Mini

57.0

Rank #61/82 · confidence 4 · eval date 2026-03-17

Knowledgereported

AA-HLE

SourceGPT-5.1

GPT-5.1

winner

28.5

Rank #53/114 · confidence 3 · eval date 2025-11-13

+0.4

GPT-5.4 Mini

28.1

Rank #55/114 · confidence 4 · eval date 2026-03-17

Multimodalreported

BenchLM Multimodal Grounded score

SourceGPT-5.1

GPT-5.1

winner

70.9

Rank #23/55 · confidence 3 · eval date 2025-11-13

+14.3

GPT-5.4 Mini

56.6

Rank #41/55 · confidence 4 · eval date 2026-03-17

Multimodalreported

AA-MMMU-Pro

SourceGPT-5.1

GPT-5.1

winner

75.5

Rank #31/68 · confidence 3 · eval date 2025-11-13

+2.2

GPT-5.4 Mini

73.3

Rank #43/68 · confidence 4 · eval date 2026-03-17

Instruction followingreported

BenchLM Instruction Following score

SourceGPT-5.1

GPT-5.1

89.1

Rank #20/51 · confidence 3 · eval date 2025-11-13

+0.5

GPT-5.4 Mini

winner

89.6

Rank #17/51 · confidence 4 · eval date 2026-03-17

Instruction followingreported

AA-IFBench

SourceGPT-5.1

GPT-5.1

72.9

Rank #27/84 · confidence 3 · eval date 2025-11-13

+0.4

GPT-5.4 Mini

winner

73.3

Rank #24/84 · confidence 4 · eval date 2026-03-17

Agentsreported

τ²-bench results

SourceGPT-5.1

GPT-5.1

81.9

Rank #53/82 · confidence 3 · eval date 2025-11-13

+11.5

GPT-5.4 Mini

winner

93.4

Rank #29/82 · confidence 4 · eval date 2026-03-17

Agentsreported

AA Agentic Index

SourceGPT-5.1

GPT-5.1

21.6

Rank #52/70 · confidence 3 · eval date 2025-11-13

+9.9

GPT-5.4 Mini

winner

31.5

Rank #31/70 · confidence 4 · eval date 2026-03-17

Agentsreported

GDPval-AA

SourceGPT-5.1

GPT-5.1

24.7

Rank #51/66 · confidence 3 · eval date 2025-11-13

+8.6

GPT-5.4 Mini

winner

33.3

Rank #38/66 · confidence 4 · eval date 2026-03-17

Agentsreported

GDPval-AA

SourceGPT-5.1

GPT-5.1

994.0

Rank #52/72 · confidence 3 · eval date 2025-11-13

+173.0

GPT-5.4 Mini

winner

1167.0

Rank #39/72 · confidence 4 · eval date 2026-03-17

API audit comparison

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

Provider
GPT-5.1
GPT-5.4 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
GPT-5.4 Mini
XShuLab Sub2API30 tests

GPT-5.1

speed / latency

152 tok/s / 936ms

input / output

No data

GPT-5.4 Mini

speed / latency

139 tok/s / 2844ms

input / output

No data

发现AI15 tests

GPT-5.1

speed / latency

N/A / N/A

input / output

No data

GPT-5.4 Mini

speed / latency

108 tok/s / 1950ms

input / output

No data

BUZZ10 tests

GPT-5.1

speed / latency

137 tok/s / 3299ms

input / output

No data

GPT-5.4 Mini

speed / latency

N/A / N/A

input / output

No data

DNSHE5 tests

GPT-5.1

speed / latency

N/A / N/A

input / output

No data

GPT-5.4 Mini

speed / latency

123 tok/s / 8529ms

input / output

No data

Lumi API5 tests

GPT-5.1

speed / latency

N/A / N/A

input / output

No data

GPT-5.4 Mini

speed / latency

93 tok/s / 4063ms

input / output

No data

兔子API

GPT-5.1

gpt-5.1-chat-latest

speed / latency

No data

input / output

$0/request

GPT-5.4 Mini

gpt-5.4-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

GPT-5.4 Mini

gpt-5.4-mini

speed / latency

No data

input / output

$0.026/M/$0.154/M

KFCV50

GPT-5.1

gpt-5.1

speed / latency

No data

input / output

$0.0068/request

GPT-5.4 Mini

gpt-5.4-mini

speed / latency

No data

input / output

$0.010/M/$0.062/M

YUNWU API

GPT-5.1

gpt-5.1-chat-latest

speed / latency

No data

input / output

$0.030/M/$0.240/M

GPT-5.4 Mini

gpt-5.4-mini

speed / latency

No data

input / output

$0.010/M/$0.062/M

Zhongzhuan Chat

GPT-5.1

gpt-5.1

speed / latency

No data

input / output

$0.030/M/$0.240/M

GPT-5.4 Mini

gpt-5.4-mini

speed / latency

No data

input / output

$0.010/M/$0.062/M

FAQ

Weighted outcome: GPT-5.4 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.