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GPT-5.1 vs GPT-5.4 Mini

Updated October 21, 2026. 72 benchmarks have a result for both. Coding is ranked on the Vibe Coding Index; every other board is shown as published.

Replace GPT-5.1 Replace GPT-5.4 Mini
GPT-5.1OpenAI
Coding
53.3
Overall
24.7
Output $/M
$10.00
54
GPT-5.4 MiniOpenAI
Coding
28.2
Overall
24.1
Output $/M
$4.50
18
vs boards won of 72 shared

Decision reading

Pick GPT-5.1 for coding: it scores 53.3 on the Vibe Coding Index against 28.2 for GPT-5.4 Mini.

Pick GPT-5.4 Mini when output tokens cost 2.2x less, or when a solved task costs $0.70 against $1.02.

Model AGPT-5.1OpenAI53.3/1002 independent benchmarks$1.02 per solved taskModel BGPT-5.4 MiniOpenAI28.2/1001 independent benchmark$0.70 per solved task
Shared results
72
GPT-5.1 only
28
GPT-5.4 Mini only
16
Like-for-like categories
7 of 9

Shared results can support a head-to-head reading. Results only one model has describe coverage, not superiority.

Which one for your work

Each card is decided by one number both models carry. Where only one has it, the card says so and makes no call.

At a glance

Coding index
GPT-5.1 53.3 from 2 benchmarks, GPT-5.4 Mini 28.2 from 1 benchmark.
Widest category
Knowledge, 7.8 points apart on average over 10 shared benchmarks.
Widest single gap
Vibe Code Bench (Vals AI): GPT-5.1 24.6% against GPT-5.4 Mini 48.0%, 23.4 points apart on a 0 to 100 scale.
Output price
GPT-5.1 $10.00 against GPT-5.4 Mini $4.50 per million output tokens, 2.2x apart.
Context window
Both take 400K tokens.

Benchmark by benchmark

First the score: boards each model leads, per category, where both have a result. Then every board, a category to a fold; bars are each result on a 0 to 100 scale, so compare the two in a row, not one row with another.

Boards won, where both have a result
CategoryGPT-5.1BarsGPT-5.4 MiniTies
Coding47
Intelligence20
Agentic work11
Reasoning104
Math22
Knowledge91
General263
All shared boards5418
CodingLike-for-likeFour of these boards feed the Vibe Coding Index47
Coding benchmarks for GPT-5.1 and GPT-5.4 Mini
BenchmarkGPT-5.1GPT-5.4 MiniLeader
SWE-bench Verified66.0%Not measuredOnly GPT-5.1 measured
LMArena WebDev13961397GPT-5.4 Mini
AA Coding Index49.456.1GPT-5.4 Mini
LiveCodeBench (Vals AI)86.5%81.5%GPT-5.1
SWE-bench Verified (Vals AI)69.8%73.0%GPT-5.4 Mini
Terminal-Bench 4 (Vals AI)Not measured2.5%Only GPT-5.4 Mini measured
Vibe Code Bench (Vals AI)24.6%48.0%GPT-5.4 Mini
Code migration (Vals AI)Not measured12.9%Only GPT-5.4 Mini measured
ProgramBench (Vals AI)Not measured0.0%Only GPT-5.4 Mini measured
Terminal-Bench 2.1 (Vals AI)Not measured54.7%Only GPT-5.4 Mini measured
LiveCodeBench (Artificial Analysis run)86.8%Not measuredOnly GPT-5.1 measured
SciCodeNot measured52.1%Only GPT-5.4 Mini measured
Terminal-Bench Hard (Artificial Analysis run)45.5%52.3%GPT-5.4 Mini
Terminal-Bench47.6%Not measuredOnly GPT-5.1 measured
FrontierCodeNot measured27.0%Only GPT-5.4 Mini measured
GSO-Bench13.7%Not measuredOnly GPT-5.1 measured
WeirdML60.8%60.3%GPT-5.1
ALE-BenchNot measured1188.6Only GPT-5.4 Mini measured
LMArena Text: coding14531438GPT-5.1
LMArena Text: software and IT14541436GPT-5.1
LMArena WebDev: React13071386GPT-5.4 Mini
LMArena WebDev: HTML14051419GPT-5.4 Mini
LMArena WebDev: from an image1421Not measuredOnly GPT-5.1 measured
Neither model has a result on the other 15 boards here
IntelligenceLike-for-likePublic boards, shown as published, kept out of the index20
Intelligence benchmarks for GPT-5.1 and GPT-5.4 Mini
BenchmarkGPT-5.1GPT-5.4 MiniLeader
AA Intelligence Index24.724.1GPT-5.1
Epoch Capabilities Index149.8148.7GPT-5.1
Agentic workLike-for-likePublic boards, shown as published, kept out of the index11
Agentic work benchmarks for GPT-5.1 and GPT-5.4 Mini
BenchmarkGPT-5.1GPT-5.4 MiniLeader
AA Agentic IndexNot measured17.9Only GPT-5.4 Mini measured
Finance Agent (Vals AI)Not measured45.4%Only GPT-5.4 Mini measured
Tax Agent Bench (Vals AI)Not measured8.8%Only GPT-5.4 Mini measured
Legal Research Bench (Vals AI)Not measured12.5%Only GPT-5.4 Mini measured
Excel Modeling Benchmark (Vals AI)Not measured45.4%Only GPT-5.4 Mini measured
τ²-Bench Telecom81.9%83.3%GPT-5.4 Mini
DeepResearch Bench42.8%36.3%GPT-5.1
Vending-Bench 2$1,473Not measuredOnly GPT-5.1 measured
Neither model has a result on the other 31 boards here
ReasoningLike-for-likePublic boards, shown as published, kept out of the index104
Reasoning benchmarks for GPT-5.1 and GPT-5.4 Mini
BenchmarkGPT-5.1GPT-5.4 MiniLeader
GPQA Diamond86.6%83.1%GPT-5.1
MMMU Pro (Vals AI)83.2%79.3%GPT-5.1
GPQA Diamond (Artificial Analysis run)87.3%87.5%GPT-5.4 Mini
Humanity's Last Exam (Artificial Analysis run)28.5%28.1%GPT-5.1
GPQA Diamond (Epoch AI run)87.6%86.9%GPT-5.1
ARC-AGI72.8%63.7%GPT-5.1
ARC-AGI-217.6%18.9%GPT-5.4 Mini
SimpleBench53.2%Not measuredOnly GPT-5.1 measured
Chess puzzles42.0%23.0%GPT-5.1
Mystery game puzzles19.0%11.0%GPT-5.1
VPCT58.7%Not measuredOnly GPT-5.1 measured
LMArena Text: hard prompts14571424GPT-5.1
LMArena Text: expert14701435GPT-5.1
LMArena Text: hard prompts in English14621420GPT-5.1
LMArena Vision: diagrams12641266GPT-5.4 Mini
LMArena Vision: homework12721285GPT-5.4 Mini
Neither model has a result on the other 5 boards here
MathLike-for-likePublic boards, shown as published, kept out of the index22
Math benchmarks for GPT-5.1 and GPT-5.4 Mini
BenchmarkGPT-5.1GPT-5.4 MiniLeader
AIME93.3%95.6%GPT-5.4 Mini
MGSM (Vals AI)93.0%Not measuredOnly GPT-5.1 measured
AA Math Index94.0Not measuredOnly GPT-5.1 measured
AIME 2025 (Artificial Analysis run)94.0%Not measuredOnly GPT-5.1 measured
OTIS Mock AIME88.6%88.9%GPT-5.4 Mini
FrontierMath, tiers 1 to 3Not measured51.2%Only GPT-5.4 Mini measured
FrontierMath, tier 4Not measured9.8%Only GPT-5.4 Mini measured
ProofBenchNot measured21.0%Only GPT-5.4 Mini measured
LMArena Text: math14461418GPT-5.1
LMArena Text: mathematical work14491429GPT-5.1
Neither model has a result on the other 3 boards here
KnowledgeLike-for-likePublic boards, shown as published, kept out of the index91
Knowledge benchmarks for GPT-5.1 and GPT-5.4 Mini
BenchmarkGPT-5.1GPT-5.4 MiniLeader
MMLU Pro86.4%84.5%GPT-5.1
LegalBench (Vals AI)85.7%Not measuredOnly GPT-5.1 measured
CaseLaw (Vals AI)73.4%51.7%GPT-5.1
CorpFin (Vals AI)63.8%60.9%GPT-5.1
TaxEval (Vals AI)74.9%71.2%GPT-5.1
MortgageTax (Vals AI)61.4%63.5%GPT-5.4 Mini
MedQA (Vals AI)96.4%Not measuredOnly GPT-5.1 measured
MedCode (Vals AI)52.7%Not measuredOnly GPT-5.1 measured
MMLU Pro (Artificial Analysis run)87.0%Not measuredOnly GPT-5.1 measured
SimpleQA Verified48.0%29.4%GPT-5.1
LMArena Text: science14591417GPT-5.1
LMArena Text: medicine and healthcare14561395GPT-5.1
LMArena Text: legal and government14591414GPT-5.1
LMArena Text: business and finance14311418GPT-5.1
Neither model has a result on the other 3 boards here
Web designDirectional onlyPublic boards, shown as published, kept out of the index8 boards, none shared
Web design benchmarks for GPT-5.1 and GPT-5.4 Mini
BenchmarkGPT-5.1GPT-5.4 MiniLeader
Design Arena: websites1187Not measuredOnly GPT-5.1 measured
Design Arena: UI components1166Not measuredOnly GPT-5.1 measured
Design Arena: game dev1179Not measuredOnly GPT-5.1 measured
Design Arena: data viz1204Not measuredOnly GPT-5.1 measured
Design Arena: 3D1061Not measuredOnly GPT-5.1 measured
Design Arena: all code categories1171Not measuredOnly GPT-5.1 measured
Design Arena: SVG1149Not measuredOnly GPT-5.1 measured
Design Arena: ASCII art1118Not measuredOnly GPT-5.1 measured
Neither model has a result on the other 1 board here
GeneralLike-for-likePublic boards, shown as published, kept out of the index263
General benchmarks for GPT-5.1 and GPT-5.4 Mini
BenchmarkGPT-5.1GPT-5.4 MiniLeader
SAGE (Vals AI)43.2%50.8%GPT-5.4 Mini
MedScribe (Vals AI)88.1%Not measuredOnly GPT-5.1 measured
Vals Multimodal IndexNot measured54.2%Only GPT-5.4 Mini measured
IFBench72.9%73.3%GPT-5.4 Mini
Long context reasoning (AA-LCR)80.0%77.0%GPT-5.1
DTBench90.1%80.0%GPT-5.1
LMCA43.9%40.8%GPT-5.1
CL-bench23.7%Not measuredOnly GPT-5.1 measured
CL-bench Life17.3%Not measuredOnly GPT-5.1 measured
LMArena Text14431412GPT-5.1
LMArena Text: instruction following14431405GPT-5.1
LMArena Text: creative writing14271370GPT-5.1
LMArena Vision12501245GPT-5.1
LMArena Text: English14511412GPT-5.1
LMArena Text: non-English14311405GPT-5.1
LMArena Text: Chinese14951446GPT-5.1
LMArena Text: German14381408GPT-5.1
LMArena Text: Japanese14531375GPT-5.1
LMArena Text: Korean14011370GPT-5.1
LMArena Text: French14501441GPT-5.1
LMArena Text: Spanish14331405GPT-5.1
LMArena Text: Russian14351417GPT-5.1
LMArena Text: Polish14401415GPT-5.1
LMArena Text: multi-turn14501429GPT-5.1
LMArena Text: longer queries14481408GPT-5.1
LMArena Text: writing and language14281393GPT-5.1
LMArena Text: entertainment and media14151373GPT-5.1
LMArena Vision: English12521244GPT-5.1
LMArena Vision: Chinese12701286GPT-5.4 Mini
LMArena Vision: reading text12551253GPT-5.1
LMArena Vision: humor12631235GPT-5.1
LMArena Vision: captioning1252Not measuredOnly GPT-5.1 measured
LMArena Vision: recognizing things12321218GPT-5.1
LMArena Vision: creative writing12661222GPT-5.1
LMArena Document1403Not measuredOnly GPT-5.1 measured
Neither model has a result on the other 11 boards here
Image generationNot comparablePublic boards, shown as published, kept out of the index0 boards, none shared
Image generation benchmarks for GPT-5.1 and GPT-5.4 Mini
BenchmarkGPT-5.1GPT-5.4 MiniLeader
Neither model has a result on 5 boards here

What each workload costs

Three fixed token mixes at each model's listed price, so per-token rates become a bill.

Chat turn

1K input + 500 output tokens

GPT-5.1$0.0063Fits in one request
GPT-5.4 Mini$0.0030Fits in one request

GPT-5.4 Mini costs less

Repository review

50K input + 3K output tokens

GPT-5.1$0.092Fits in one request
GPT-5.4 Mini$0.051Fits in one request

GPT-5.4 Mini costs less

Agent loop

200K input + 10K output tokens

GPT-5.1$0.350Fits in one request
GPT-5.4 Mini$0.195Fits in one request

GPT-5.4 Mini costs less

Listed OpenRouter rates, without cache or batch discounts. A workload that does not fit a model's context window would need splitting.

Specification differences

The leading value in a row is marked; a row with a missing value names no leader. Our two rows are marked in red.

Specifications of GPT-5.1 and GPT-5.4 Mini
SpecificationOpenAI GPT-5.1OpenAI GPT-5.4 Mini
MakerOpenAIOpenAI
WeightsNo public weights listedNo public weights listed
ReleasedNovember 13, 2025March 17, 2026
Context window400K400K
Input $/Mtok$1.25$0.75
Output $/Mtok$10.00$4.50
Coding index53.328.2
Independent measurements behind it21
Cost per solved task$1.02$0.70
SourceOpenRouter listingOpenRouter listing

Questions

Is GPT-5.1 better than GPT-5.4 Mini for coding?

Pick GPT-5.1 for coding: it scores 53.3 on the Vibe Coding Index against 28.2 for GPT-5.4 Mini. Pick GPT-5.4 Mini when output tokens cost 2.2x less, or when a solved task costs $0.70 against $1.02.

Which is cheaper, GPT-5.1 or GPT-5.4 Mini?

GPT-5.1 costs $1.25 per million input tokens and $10.00 per million output tokens; GPT-5.4 Mini costs $0.75 and $4.50. Per solved SWE-bench Verified task, GPT-5.1 costs $1.02 and GPT-5.4 Mini $0.70.

Which has the bigger context window, GPT-5.1 or GPT-5.4 Mini?

Neither: both take 400K tokens.

How many benchmarks is the GPT-5.1 vs GPT-5.4 Mini comparison based on?

72 benchmarks have a result for both models as of October 21, 2026. GPT-5.1's coding index rests on 2 independent benchmarks and GPT-5.4 Mini's on 1. Where only one model has a result, the page says so instead of naming a winner.

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