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GPT-5.1 vs o3 Mini

Updated October 21, 2026. 60 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 o3 Mini
GPT-5.1OpenAI
Coding
53.3
Overall
24.7
Output $/M
$10.00
60
o3 MiniOpenAI
Coding
52.1
Overall
12.5
Output $/M
$4.40
0
vs boards won of 60 shared

Decision reading

GPT-5.1 and o3 Mini are level for coding, 53.3 against 52.1 on the Vibe Coding Index, so price and context decide.

Pick o3 Mini when output tokens cost 2.3x less. Pick GPT-5.1 when the context window is larger, 400K against 200K tokens, or when what matters is SWE-bench Verified or LiveCodeBench (Vals AI), where it leads.

Model AGPT-5.1OpenAI53.3/1002 independent benchmarks$1.02 per solved taskModel Bo3 MiniOpenAI52.1/1002 independent benchmarksNo cost per solved task
Shared results
60
GPT-5.1 only
40
o3 Mini only
10
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, o3 Mini 52.1 from 2 benchmarks.
Widest category
Agentic work, 50.6 points apart on average over 1 shared benchmark.
Widest single gap
τ²-Bench Telecom: GPT-5.1 81.9% against o3 Mini 31.3%, 50.6 points apart on a 0 to 100 scale.
Output price
GPT-5.1 $10.00 against o3 Mini $4.40 per million output tokens, 2.3x apart.
Context window
GPT-5.1 takes 400K tokens, o3 Mini 200K.

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-5.1Barso3 MiniTies
Coding80
Intelligence20
Agentic work10
Reasoning120
Math50
Knowledge110
General210
All shared boards600
CodingLike-for-likeFour of these boards feed the Vibe Coding Index80
Coding benchmarks for GPT-5.1 and o3 Mini
BenchmarkGPT-5.1o3 MiniLeader
Aider polyglotNot measured60.4%Only o3 Mini measured
SWE-bench Verified66.0%42.4%GPT-5.1
SWE-bench LiteNot measured32.3%Only o3 Mini measured
LMArena WebDev1396Not measuredOnly GPT-5.1 measured
AA Coding Index49.4Not measuredOnly GPT-5.1 measured
LiveCodeBench (Vals AI)86.5%71.5%GPT-5.1
SWE-bench Verified (Vals AI)69.8%Not measuredOnly GPT-5.1 measured
Vibe Code Bench (Vals AI)24.6%Not measuredOnly GPT-5.1 measured
LiveCodeBench (Artificial Analysis run)86.8%73.4%GPT-5.1
SciCodeNot measured42.8%Only o3 Mini measured
Terminal-Bench Hard (Artificial Analysis run)45.5%6.8%GPT-5.1
Terminal-Bench47.6%Not measuredOnly GPT-5.1 measured
GSO-Bench13.7%1.3%GPT-5.1
WeirdML60.8%43.7%GPT-5.1
CybenchNot measured22.5%Only o3 Mini measured
LMArena Text: coding14531378GPT-5.1
LMArena Text: software and IT14541364GPT-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 18 boards here
IntelligenceLike-for-likePublic boards, shown as published, kept out of the index20
Intelligence benchmarks for GPT-5.1 and o3 Mini
BenchmarkGPT-5.1o3 MiniLeader
AA Intelligence Index24.712.5GPT-5.1
Epoch Capabilities Index149.8140.2GPT-5.1
Agentic workLike-for-likePublic boards, shown as published, kept out of the index10
Agentic work benchmarks for GPT-5.1 and o3 Mini
BenchmarkGPT-5.1o3 MiniLeader
τ²-Bench Telecom81.9%31.3%GPT-5.1
DeepResearch Bench42.8%Not measuredOnly GPT-5.1 measured
Vending-Bench 2$1,473Not measuredOnly GPT-5.1 measured
Neither model has a result on the other 36 boards here
ReasoningLike-for-likePublic boards, shown as published, kept out of the index120
Reasoning benchmarks for GPT-5.1 and o3 Mini
BenchmarkGPT-5.1o3 MiniLeader
GPQA Diamond86.6%75.5%GPT-5.1
MMMU Pro (Vals AI)83.2%Not measuredOnly GPT-5.1 measured
GPQA Diamond (Artificial Analysis run)87.3%77.3%GPT-5.1
Humanity's Last Exam (Artificial Analysis run)28.5%12.0%GPT-5.1
GPQA Diamond (Epoch AI run)87.6%77.0%GPT-5.1
ARC-AGI72.8%34.5%GPT-5.1
ARC-AGI-217.6%3.0%GPT-5.1
SimpleBench53.2%22.8%GPT-5.1
Chess puzzles42.0%15.0%GPT-5.1
Mystery game puzzles19.0%7.0%GPT-5.1
VPCT58.7%Not measuredOnly GPT-5.1 measured
LMArena Text: hard prompts14571365GPT-5.1
LMArena Text: expert14701364GPT-5.1
LMArena Text: hard prompts in English14621375GPT-5.1
LMArena Vision: diagrams1264Not measuredOnly GPT-5.1 measured
LMArena Vision: homework1272Not measuredOnly GPT-5.1 measured
Neither model has a result on the other 5 boards here
MathLike-for-likePublic boards, shown as published, kept out of the index50
Math benchmarks for GPT-5.1 and o3 Mini
BenchmarkGPT-5.1o3 MiniLeader
AIME93.3%86.5%GPT-5.1
MATH 500 (Vals AI)Not measured91.8%Only o3 Mini measured
MGSM (Vals AI)93.0%91.3%GPT-5.1
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%76.9%GPT-5.1
FrontierMath, tiers 1 to 3Not measured18.6%Only o3 Mini measured
FrontierMath, tier 4Not measured0.0%Only o3 Mini measured
MATH level 5Not measured96.5%Only o3 Mini measured
LMArena Text: math14461396GPT-5.1
LMArena Text: mathematical work14491399GPT-5.1
Neither model has a result on the other 2 boards here
KnowledgeLike-for-likePublic boards, shown as published, kept out of the index110
Knowledge benchmarks for GPT-5.1 and o3 Mini
BenchmarkGPT-5.1o3 MiniLeader
MMLU Pro86.4%78.7%GPT-5.1
LegalBench (Vals AI)85.7%71.5%GPT-5.1
CaseLaw (Vals AI)73.4%Not measuredOnly GPT-5.1 measured
CorpFin (Vals AI)63.8%45.3%GPT-5.1
TaxEval (Vals AI)74.9%69.4%GPT-5.1
MortgageTax (Vals AI)61.4%Not measuredOnly GPT-5.1 measured
MedQA (Vals AI)96.4%94.8%GPT-5.1
MedCode (Vals AI)52.7%Not measuredOnly GPT-5.1 measured
MMLU Pro (Artificial Analysis run)87.0%80.2%GPT-5.1
SimpleQA Verified48.0%15.3%GPT-5.1
LMArena Text: science14591339GPT-5.1
LMArena Text: medicine and healthcare14561330GPT-5.1
LMArena Text: legal and government14591328GPT-5.1
LMArena Text: business and finance14311313GPT-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 o3 Mini
BenchmarkGPT-5.1o3 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 index210
General benchmarks for GPT-5.1 and o3 Mini
BenchmarkGPT-5.1o3 MiniLeader
SAGE (Vals AI)43.2%Not measuredOnly GPT-5.1 measured
MedScribe (Vals AI)88.1%Not measuredOnly GPT-5.1 measured
IFBench72.9%67.1%GPT-5.1
Long context reasoning (AA-LCR)80.0%43.0%GPT-5.1
DTBench90.1%68.8%GPT-5.1
LMCA43.9%19.0%GPT-5.1
Fiction.LiveBenchNot measured50.0%Only o3 Mini measured
Creative writing (Lech Mazur)Not measured61.7%Only o3 Mini measured
CL-bench23.7%Not measuredOnly GPT-5.1 measured
CL-bench Life17.3%Not measuredOnly GPT-5.1 measured
LMArena Text14431337GPT-5.1
LMArena Text: instruction following14431337GPT-5.1
LMArena Text: creative writing14271286GPT-5.1
LMArena Vision1250Not measuredOnly GPT-5.1 measured
LMArena Text: English14511351GPT-5.1
LMArena Text: non-English14311319GPT-5.1
LMArena Text: Chinese14951379GPT-5.1
LMArena Text: German14381303GPT-5.1
LMArena Text: Japanese14531286GPT-5.1
LMArena Text: Korean14011313GPT-5.1
LMArena Text: French14501334GPT-5.1
LMArena Text: Spanish14331321GPT-5.1
LMArena Text: Russian14351304GPT-5.1
LMArena Text: Polish14401294GPT-5.1
LMArena Text: multi-turn14501320GPT-5.1
LMArena Text: longer queries14481343GPT-5.1
LMArena Text: writing and language14281313GPT-5.1
LMArena Text: entertainment and media14151283GPT-5.1
LMArena Vision: English1252Not measuredOnly GPT-5.1 measured
LMArena Vision: Chinese1270Not measuredOnly GPT-5.1 measured
LMArena Vision: reading text1255Not measuredOnly GPT-5.1 measured
LMArena Vision: humor1263Not measuredOnly GPT-5.1 measured
LMArena Vision: captioning1252Not measuredOnly GPT-5.1 measured
LMArena Vision: recognizing things1232Not measuredOnly GPT-5.1 measured
LMArena Vision: creative writing1266Not measuredOnly GPT-5.1 measured
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 o3 Mini
BenchmarkGPT-5.1o3 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
o3 Mini$0.0033Fits in one request

o3 Mini costs less

Repository review

50K input + 3K output tokens

GPT-5.1$0.092Fits in one request
o3 Mini$0.068Fits in one request

o3 Mini costs less

Agent loop

200K input + 10K output tokens

GPT-5.1$0.350Fits in one request
o3 Mini$0.264Exceeds the context window

o3 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 o3 Mini
SpecificationOpenAI GPT-5.1OpenAI o3 Mini
MakerOpenAIOpenAI
WeightsNo public weights listedNo public weights listed
ReleasedNovember 13, 2025January 31, 2025
Context window400K200K
Input $/Mtok$1.25$1.10
Output $/Mtok$10.00$4.40
Coding index53.352.1
Independent measurements behind it22
Cost per solved task$1.02Not computable
SourceOpenRouter listingOpenRouter listing

Questions

Is GPT-5.1 better than o3 Mini for coding?

GPT-5.1 and o3 Mini are level for coding, 53.3 against 52.1 on the Vibe Coding Index, so price and context decide. Pick o3 Mini when output tokens cost 2.3x less. Pick GPT-5.1 when the context window is larger, 400K against 200K tokens, or when what matters is SWE-bench Verified or LiveCodeBench (Vals AI), where it leads.

Which is cheaper, GPT-5.1 or o3 Mini?

GPT-5.1 costs $1.25 per million input tokens and $10.00 per million output tokens; o3 Mini costs $1.10 and $4.40. Cost per solved task is known for GPT-5.1 only.

Which has the bigger context window, GPT-5.1 or o3 Mini?

GPT-5.1, with 400K tokens against 200K.

How many benchmarks is the GPT-5.1 vs o3 Mini comparison based on?

60 benchmarks have a result for both models as of October 21, 2026. GPT-5.1's coding index rests on 2 independent benchmarks and o3 Mini's on 2. Where only one model has a result, the page says so instead of naming a winner.

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<p style="font:13px/1.4 sans-serif;margin:6px 0 0">Source: <a href="https://llmbenchmark.ai/compare/gpt-5-1-vs-o3-mini">LLMBenchmark.ai, GPT-5.1 vs o3 Mini</a></p>