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GPT-5.1 vs GPT-5 Mini

GPT-5.1 leads GPT-5 Mini on coding, 40.4 to 34.2 on the Vibe Coding Index, and GPT-5 Mini costs 5.0x less per output token ($2.00 vs $10.00 per million). Updated October 22, 2026; 90 benchmarks have a result for both.

Replace GPT-5.1 Replace GPT-5 Mini
GPT-5.1OpenAI
Coding
40.4
Overall
55.0
Output $/M
$10.00
85
GPT-5 MiniOpenAI
Coding
34.2
Overall
43.7
Output $/M
$2.00
5
vs boards won of 90 shared

GPT-5.1 or GPT-5 Mini: which to pick

Pick GPT-5.1 for coding: it scores 40.4 on the Vibe Coding Index against 34.2 for GPT-5 Mini.

Pick GPT-5 Mini for output tokens 5.0x cheaper ($2.00 vs $10.00 per million) and a lower cost per solved task ($0.08 against $1.02).

Model AGPT-5.1OpenAI40.4/1003 independent benchmarks$1.02 per solved taskModel BGPT-5 MiniOpenAI34.2/1002 independent benchmarks$0.08 per solved task
Shared results
90
GPT-5.1 only
11
GPT-5 Mini only
11
Like-for-like categories
8 of 9

Only benchmarks that tested both models count toward a pick; a result only one model has is shown but not compared.

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 40.4 from 3 benchmarks, GPT-5 Mini 34.2 from 2 benchmarks.
Widest category
Reasoning, 11.6 points apart on average over 15 shared benchmarks.
Widest single gap
SimpleQA Verified: GPT-5.1 48.0% against GPT-5 Mini 21.6%, 26.4 points apart on a 0 to 100 scale.
Output price
GPT-5.1 $10.00 against GPT-5 Mini $2.00 per million output tokens, 5.0x 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 MiniTies
Coding91
Intelligence20
Agentic work20
Reasoning150
Math70
Knowledge132
Web design71
General301
All shared boards855
CodingLike-for-likeSix of these boards feed the Vibe Coding Index91
Coding benchmarks for GPT-5.1 and GPT-5 Mini
BenchmarkGPT-5.1GPT-5 MiniLeader
SWE-bench Verified66.0%59.8%GPT-5.1
SWE-bench MultilingualNot measured39.7%Only GPT-5 Mini measured
LMArena WebDev1396Not measuredOnly GPT-5.1 measured
AA Coding Index49.4Not measuredOnly GPT-5.1 measured
LiveCodeBench (Vals AI)86.5%86.6%GPT-5 Mini
SWE-bench Verified (Vals AI)69.8%60.8%GPT-5.1
Vibe Code Bench (Vals AI)24.6%14.2%GPT-5.1
LiveCodeBench (Artificial Analysis run)86.8%83.8%GPT-5.1
SciCodeNot measured39.0%Only GPT-5 Mini measured
Terminal-Bench Hard (Artificial Analysis run)45.5%33.3%GPT-5.1
Terminal-Bench47.6%34.8%GPT-5.1
GSO-Bench13.7%Not measuredOnly GPT-5.1 measured
WeirdML60.8%52.7%GPT-5.1
LMArena Text: coding14531406GPT-5.1
LMArena Text: software and IT14541394GPT-5.1
LMArena WebDev: React1307Not measuredOnly GPT-5.1 measured
LMArena WebDev: HTML1405Not measuredOnly GPT-5.1 measured
LMArena WebDev: from an image1421Not measuredOnly GPT-5.1 measured
Neither model has a result on the other 21 boards here
IntelligenceLike-for-likePublic boards, shown as published, kept out of the index20
Intelligence benchmarks for GPT-5.1 and GPT-5 Mini
BenchmarkGPT-5.1GPT-5 MiniLeader
AA Intelligence Index24.720.6GPT-5.1
Epoch Capabilities Index149.8145.3GPT-5.1
Agentic workLike-for-likePublic boards, shown as published, kept out of the index20
Agentic work benchmarks for GPT-5.1 and GPT-5 Mini
BenchmarkGPT-5.1GPT-5 MiniLeader
τ²-Bench Telecom81.9%71.1%GPT-5.1
DeepResearch Bench42.8%Not measuredOnly GPT-5.1 measured
Vending-Bench 2$1,473-$31GPT-5.1
Berkeley Function Calling Leaderboard (BFCL)Not measured55.5%Only GPT-5 Mini measured
Neither model has a result on the other 37 boards here
ReasoningLike-for-likePublic boards, shown as published, kept out of the index150
Reasoning benchmarks for GPT-5.1 and GPT-5 Mini
BenchmarkGPT-5.1GPT-5 MiniLeader
GPQA Diamond86.6%80.3%GPT-5.1
MMMU Pro (Vals AI)83.2%78.9%GPT-5.1
GPQA Diamond (Artificial Analysis run)87.3%82.8%GPT-5.1
Humanity's Last Exam (Artificial Analysis run)28.5%21.5%GPT-5.1
GPQA Diamond (Epoch AI run)87.6%75.0%GPT-5.1
ARC-AGI72.8%54.3%GPT-5.1
ARC-AGI-217.6%4.4%GPT-5.1
SimpleBench53.2%Not measuredOnly GPT-5.1 measured
Chess puzzles42.0%24.0%GPT-5.1
Mystery game puzzles19.0%10.0%GPT-5.1
VPCT58.7%40.2%GPT-5.1
LMArena Text: hard prompts14571380GPT-5.1
LMArena Text: expert14701379GPT-5.1
LMArena Text: hard prompts in English14621383GPT-5.1
LMArena Vision: diagrams12641202GPT-5.1
LMArena Vision: homework12721210GPT-5.1
Kagi LLM BenchmarkNot measured70.3%Only GPT-5 Mini measured
Neither model has a result on the other 5 boards here
MathLike-for-likePublic boards, shown as published, kept out of the index70
Math benchmarks for GPT-5.1 and GPT-5 Mini
BenchmarkGPT-5.1GPT-5 MiniLeader
AIME93.3%91.5%GPT-5.1
MATH 500 (Vals AI)Not measured94.8%Only GPT-5 Mini measured
MGSM (Vals AI)93.0%92.6%GPT-5.1
AA Math Index94.090.7GPT-5.1
AIME 2025 (Artificial Analysis run)94.0%90.7%GPT-5.1
OTIS Mock AIME88.6%86.7%GPT-5.1
FrontierMath, tiers 1 to 3Not measured46.7%Only GPT-5 Mini measured
FrontierMath, tier 4Not measured12.2%Only GPT-5 Mini measured
ProofBenchNot measured9.0%Only GPT-5 Mini measured
MATH level 5Not measured97.8%Only GPT-5 Mini measured
LMArena Text: math14461378GPT-5.1
LMArena Text: mathematical work14491380GPT-5.1
Neither model has a result on the other 1 board here
KnowledgeLike-for-likePublic boards, shown as published, kept out of the index132
Knowledge benchmarks for GPT-5.1 and GPT-5 Mini
BenchmarkGPT-5.1GPT-5 MiniLeader
MMLU Pro86.4%82.2%GPT-5.1
LegalBench (Vals AI)85.7%81.8%GPT-5.1
CaseLaw (Vals AI)73.4%68.5%GPT-5.1
CorpFin (Vals AI)63.8%60.2%GPT-5.1
TaxEval (Vals AI)74.9%75.2%GPT-5 Mini
MortgageTax (Vals AI)61.4%66.9%GPT-5 Mini
MedQA (Vals AI)96.4%96.1%GPT-5.1
MedCode (Vals AI)52.7%43.0%GPT-5.1
MMLU Pro (Artificial Analysis run)87.0%83.7%GPT-5.1
SimpleQA Verified48.0%21.6%GPT-5.1
LMArena Text: science14591371GPT-5.1
LMArena Text: medicine and healthcare14561380GPT-5.1
LMArena Text: legal and government14591375GPT-5.1
LMArena Text: business and finance14311358GPT-5.1
FACTS Benchmark Suite45.0%38.6%GPT-5.1
Neither model has a result on the other 3 boards here
Web designLike-for-likePublic boards, shown as published, kept out of the index71
Web design benchmarks for GPT-5.1 and GPT-5 Mini
BenchmarkGPT-5.1GPT-5 MiniLeader
Design Arena: websites11871125GPT-5.1
Design Arena: UI components11631103GPT-5.1
Design Arena: game dev11781129GPT-5.1
Design Arena: data viz12041131GPT-5.1
Design Arena: 3D10601036GPT-5.1
Design Arena: all code categories11701114GPT-5.1
Design Arena: SVG11491091GPT-5.1
Design Arena: ASCII art11191125GPT-5 Mini
Neither model has a result on the other 1 board here
GeneralLike-for-likePublic boards, shown as published, kept out of the index301
General benchmarks for GPT-5.1 and GPT-5 Mini
BenchmarkGPT-5.1GPT-5 MiniLeader
SAGE (Vals AI)43.2%43.0%GPT-5.1
MedScribe (Vals AI)88.1%80.6%GPT-5.1
IFBench72.9%75.4%GPT-5 Mini
Long context reasoning (AA-LCR)80.0%72.3%GPT-5.1
DTBench90.1%80.5%GPT-5.1
LMCA43.9%34.2%GPT-5.1
Fiction.LiveBenchNot measured69.4%Only GPT-5 Mini measured
Creative writing (Lech Mazur)Not measured83.1%Only GPT-5 Mini measured
CL-bench23.7%Not measuredOnly GPT-5.1 measured
CL-bench Life17.3%Not measuredOnly GPT-5.1 measured
LMArena Text14431373GPT-5.1
LMArena Text: instruction following14431357GPT-5.1
LMArena Text: creative writing14271325GPT-5.1
LMArena Vision12501202GPT-5.1
LMArena Text: English14511379GPT-5.1
LMArena Text: non-English14311363GPT-5.1
LMArena Text: Chinese14951386GPT-5.1
LMArena Text: German14381366GPT-5.1
LMArena Text: Japanese14531341GPT-5.1
LMArena Text: Korean14011308GPT-5.1
LMArena Text: French14501386GPT-5.1
LMArena Text: Spanish14331354GPT-5.1
LMArena Text: Russian14351362GPT-5.1
LMArena Text: Polish14401378GPT-5.1
LMArena Text: multi-turn14501363GPT-5.1
LMArena Text: longer queries14481355GPT-5.1
LMArena Text: writing and language14281344GPT-5.1
LMArena Text: entertainment and media14151340GPT-5.1
LMArena Vision: English12521216GPT-5.1
LMArena Vision: Chinese12701214GPT-5.1
LMArena Vision: reading text12551199GPT-5.1
LMArena Vision: humor12631205GPT-5.1
LMArena Vision: captioning12521217GPT-5.1
LMArena Vision: recognizing things12321226GPT-5.1
LMArena Vision: creative writing12661181GPT-5.1
LMArena Document1403Not measuredOnly GPT-5.1 measured
Neither model has a result on the other 10 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 Mini
BenchmarkGPT-5.1GPT-5 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 Mini$0.0013Fits in one request

GPT-5 Mini costs less

Repository review

50K input + 3K output tokens

GPT-5.1$0.092Fits in one request
GPT-5 Mini$0.018Fits in one request

GPT-5 Mini costs less

Agent loop

200K input + 10K output tokens

GPT-5.1$0.350Fits in one request
GPT-5 Mini$0.070Fits in one request

GPT-5 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 Mini
SpecificationOpenAI GPT-5.1OpenAI GPT-5 Mini
MakerOpenAIOpenAI
WeightsNo public weights listedNo public weights listed
ReleasedNovember 13, 2025August 7, 2025
Context window400K400K
Input $/Mtok$1.25$0.25
Output $/Mtok$10.00$2.00
Coding index40.434.2
Independent measurements behind it32
Cost per solved task$1.02$0.08
SourceOpenRouter listingOpenRouter listing

Questions

Is GPT-5.1 better than GPT-5 Mini for coding?

Pick GPT-5.1 for coding: it scores 40.4 on the Vibe Coding Index against 34.2 for GPT-5 Mini. Pick GPT-5 Mini for output tokens 5.0x cheaper ($2.00 vs $10.00 per million) and a lower cost per solved task ($0.08 against $1.02).

Which is cheaper, GPT-5.1 or GPT-5 Mini?

GPT-5.1 costs $1.25 per million input tokens and $10.00 per million output tokens; GPT-5 Mini costs $0.25 and $2.00. Per solved SWE-bench Verified task, GPT-5.1 costs $1.02 and GPT-5 Mini $0.08.

Which has the bigger context window, GPT-5.1 or GPT-5 Mini?

Neither: both take 400K tokens.

How many benchmarks is the GPT-5.1 vs GPT-5 Mini comparison based on?

90 benchmarks have a result for both models as of October 22, 2026. GPT-5.1's coding index rests on 3 independent benchmarks and GPT-5 Mini's on 2. Where only one model has a result, the page says so instead of naming a winner.

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