LLMBenchmark.ai

Enter opens the highlighted result. Esc closes.

GPT-5.4 Mini vs o3 Mini

Updated October 21, 2026. 55 benchmarks have a result for both. Coding is ranked on the Vibe Coding Index; every other board is shown as published.

Replace GPT-5.4 Mini Replace o3 Mini
GPT-5.4 MiniOpenAI
Coding
28.2
Overall
24.1
Output $/M
$4.50
55
o3 MiniOpenAI
Coding
52.1
Overall
12.5
Output $/M
$4.40
0
vs boards won of 55 shared

Decision reading

Pick o3 Mini for coding: it scores 52.1 on the Vibe Coding Index against 28.2 for GPT-5.4 Mini.

Pick GPT-5.4 Mini when the context window is larger, 400K against 200K tokens, or when what matters is LiveCodeBench (Vals AI) or SciCode, where it leads.

Model AGPT-5.4 MiniOpenAI28.2/1001 independent benchmark$0.70 per solved taskModel Bo3 MiniOpenAI52.1/1002 independent benchmarksNo cost per solved task
Shared results
55
GPT-5.4 Mini only
33
o3 Mini only
15
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-5.4 Mini 28.2 from 1 benchmark, o3 Mini 52.1 from 2 benchmarks.
Widest category
Agentic work, 52.0 points apart on average over 1 shared benchmark.
Widest single gap
τ²-Bench Telecom: GPT-5.4 Mini 83.3% against o3 Mini 31.3%, 52.0 points apart on a 0 to 100 scale.
Output price
GPT-5.4 Mini $4.50 against o3 Mini $4.40 per million output tokens, 1.0x apart.
Context window
GPT-5.4 Mini 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-5.4 MiniBarso3 MiniTies
Coding60
Intelligence20
Agentic work10
Reasoning110
Math60
Knowledge80
General210
All shared boards550
CodingLike-for-likeFour of these boards feed the Vibe Coding Index60
Coding benchmarks for GPT-5.4 Mini and o3 Mini
BenchmarkGPT-5.4 Minio3 MiniLeader
Aider polyglotNot measured60.4%Only o3 Mini measured
SWE-bench VerifiedNot measured42.4%Only o3 Mini measured
SWE-bench LiteNot measured32.3%Only o3 Mini measured
LMArena WebDev1397Not measuredOnly GPT-5.4 Mini measured
AA Coding Index56.1Not measuredOnly GPT-5.4 Mini measured
LiveCodeBench (Vals AI)81.5%71.5%GPT-5.4 Mini
SWE-bench Verified (Vals AI)73.0%Not measuredOnly GPT-5.4 Mini measured
Terminal-Bench 4 (Vals AI)2.5%Not measuredOnly GPT-5.4 Mini measured
Vibe Code Bench (Vals AI)48.0%Not measuredOnly GPT-5.4 Mini measured
Code migration (Vals AI)12.9%Not measuredOnly GPT-5.4 Mini measured
ProgramBench (Vals AI)0.0%Not measuredOnly GPT-5.4 Mini measured
Terminal-Bench 2.1 (Vals AI)54.7%Not measuredOnly GPT-5.4 Mini measured
LiveCodeBench (Artificial Analysis run)Not measured73.4%Only o3 Mini measured
SciCode52.1%42.8%GPT-5.4 Mini
Terminal-Bench Hard (Artificial Analysis run)52.3%6.8%GPT-5.4 Mini
FrontierCode27.0%Not measuredOnly GPT-5.4 Mini measured
GSO-BenchNot measured1.3%Only o3 Mini measured
WeirdML60.3%43.7%GPT-5.4 Mini
CybenchNot measured22.5%Only o3 Mini measured
ALE-Bench1188.6Not measuredOnly GPT-5.4 Mini measured
LMArena Text: coding14381378GPT-5.4 Mini
LMArena Text: software and IT14361364GPT-5.4 Mini
LMArena WebDev: React1386Not measuredOnly GPT-5.4 Mini measured
LMArena WebDev: HTML1419Not measuredOnly GPT-5.4 Mini measured
Neither model has a result on the other 14 boards here
IntelligenceLike-for-likePublic boards, shown as published, kept out of the index20
Intelligence benchmarks for GPT-5.4 Mini and o3 Mini
BenchmarkGPT-5.4 Minio3 MiniLeader
AA Intelligence Index24.112.5GPT-5.4 Mini
Epoch Capabilities Index148.7140.2GPT-5.4 Mini
Agentic workLike-for-likePublic boards, shown as published, kept out of the index10
Agentic work benchmarks for GPT-5.4 Mini and o3 Mini
BenchmarkGPT-5.4 Minio3 MiniLeader
AA Agentic Index17.9Not measuredOnly GPT-5.4 Mini measured
Finance Agent (Vals AI)45.4%Not measuredOnly GPT-5.4 Mini measured
Tax Agent Bench (Vals AI)8.8%Not measuredOnly GPT-5.4 Mini measured
Legal Research Bench (Vals AI)12.5%Not measuredOnly GPT-5.4 Mini measured
Excel Modeling Benchmark (Vals AI)45.4%Not measuredOnly GPT-5.4 Mini measured
τ²-Bench Telecom83.3%31.3%GPT-5.4 Mini
DeepResearch Bench36.3%Not measuredOnly GPT-5.4 Mini measured
Neither model has a result on the other 32 boards here
ReasoningLike-for-likePublic boards, shown as published, kept out of the index110
Reasoning benchmarks for GPT-5.4 Mini and o3 Mini
BenchmarkGPT-5.4 Minio3 MiniLeader
GPQA Diamond83.1%75.5%GPT-5.4 Mini
MMMU Pro (Vals AI)79.3%Not measuredOnly GPT-5.4 Mini measured
GPQA Diamond (Artificial Analysis run)87.5%77.3%GPT-5.4 Mini
Humanity's Last Exam (Artificial Analysis run)28.1%12.0%GPT-5.4 Mini
GPQA Diamond (Epoch AI run)86.9%77.0%GPT-5.4 Mini
ARC-AGI63.7%34.5%GPT-5.4 Mini
ARC-AGI-218.9%3.0%GPT-5.4 Mini
SimpleBenchNot measured22.8%Only o3 Mini measured
Chess puzzles23.0%15.0%GPT-5.4 Mini
Mystery game puzzles11.0%7.0%GPT-5.4 Mini
LMArena Text: hard prompts14241365GPT-5.4 Mini
LMArena Text: expert14351364GPT-5.4 Mini
LMArena Text: hard prompts in English14201375GPT-5.4 Mini
LMArena Vision: diagrams1266Not measuredOnly GPT-5.4 Mini measured
LMArena Vision: homework1285Not measuredOnly GPT-5.4 Mini measured
Neither model has a result on the other 6 boards here
MathLike-for-likePublic boards, shown as published, kept out of the index60
Math benchmarks for GPT-5.4 Mini and o3 Mini
BenchmarkGPT-5.4 Minio3 MiniLeader
AIME95.6%86.5%GPT-5.4 Mini
MATH 500 (Vals AI)Not measured91.8%Only o3 Mini measured
MGSM (Vals AI)Not measured91.3%Only o3 Mini measured
OTIS Mock AIME88.9%76.9%GPT-5.4 Mini
FrontierMath, tiers 1 to 351.2%18.6%GPT-5.4 Mini
FrontierMath, tier 49.8%0.0%GPT-5.4 Mini
ProofBench21.0%Not measuredOnly GPT-5.4 Mini measured
MATH level 5Not measured96.5%Only o3 Mini measured
LMArena Text: math14181396GPT-5.4 Mini
LMArena Text: mathematical work14291399GPT-5.4 Mini
Neither model has a result on the other 3 boards here
KnowledgeLike-for-likePublic boards, shown as published, kept out of the index80
Knowledge benchmarks for GPT-5.4 Mini and o3 Mini
BenchmarkGPT-5.4 Minio3 MiniLeader
MMLU Pro84.5%78.7%GPT-5.4 Mini
LegalBench (Vals AI)Not measured71.5%Only o3 Mini measured
CaseLaw (Vals AI)51.7%Not measuredOnly GPT-5.4 Mini measured
CorpFin (Vals AI)60.9%45.3%GPT-5.4 Mini
TaxEval (Vals AI)71.2%69.4%GPT-5.4 Mini
MortgageTax (Vals AI)63.5%Not measuredOnly GPT-5.4 Mini measured
MedQA (Vals AI)Not measured94.8%Only o3 Mini measured
MMLU Pro (Artificial Analysis run)Not measured80.2%Only o3 Mini measured
SimpleQA Verified29.4%15.3%GPT-5.4 Mini
LMArena Text: science14171339GPT-5.4 Mini
LMArena Text: medicine and healthcare13951330GPT-5.4 Mini
LMArena Text: legal and government14141328GPT-5.4 Mini
LMArena Text: business and finance14181313GPT-5.4 Mini
Neither model has a result on the other 4 boards here
Web designNot comparablePublic boards, shown as published, kept out of the index0 boards, none shared
Web design benchmarks for GPT-5.4 Mini and o3 Mini
BenchmarkGPT-5.4 Minio3 MiniLeader
Neither model has a result on 9 boards here
GeneralLike-for-likePublic boards, shown as published, kept out of the index210
General benchmarks for GPT-5.4 Mini and o3 Mini
BenchmarkGPT-5.4 Minio3 MiniLeader
SAGE (Vals AI)50.8%Not measuredOnly GPT-5.4 Mini measured
Vals Multimodal Index54.2%Not measuredOnly GPT-5.4 Mini measured
IFBench73.3%67.1%GPT-5.4 Mini
Long context reasoning (AA-LCR)77.0%43.0%GPT-5.4 Mini
DTBench80.0%68.8%GPT-5.4 Mini
LMCA40.8%19.0%GPT-5.4 Mini
Fiction.LiveBenchNot measured50.0%Only o3 Mini measured
Creative writing (Lech Mazur)Not measured61.7%Only o3 Mini measured
LMArena Text14121337GPT-5.4 Mini
LMArena Text: instruction following14051337GPT-5.4 Mini
LMArena Text: creative writing13701286GPT-5.4 Mini
LMArena Vision1245Not measuredOnly GPT-5.4 Mini measured
LMArena Text: English14121351GPT-5.4 Mini
LMArena Text: non-English14051319GPT-5.4 Mini
LMArena Text: Chinese14461379GPT-5.4 Mini
LMArena Text: German14081303GPT-5.4 Mini
LMArena Text: Japanese13751286GPT-5.4 Mini
LMArena Text: Korean13701313GPT-5.4 Mini
LMArena Text: French14411334GPT-5.4 Mini
LMArena Text: Spanish14051321GPT-5.4 Mini
LMArena Text: Russian14171304GPT-5.4 Mini
LMArena Text: Polish14151294GPT-5.4 Mini
LMArena Text: multi-turn14291320GPT-5.4 Mini
LMArena Text: longer queries14081343GPT-5.4 Mini
LMArena Text: writing and language13931313GPT-5.4 Mini
LMArena Text: entertainment and media13731283GPT-5.4 Mini
LMArena Vision: English1244Not measuredOnly GPT-5.4 Mini measured
LMArena Vision: Chinese1286Not measuredOnly GPT-5.4 Mini measured
LMArena Vision: reading text1253Not measuredOnly GPT-5.4 Mini measured
LMArena Vision: humor1235Not measuredOnly GPT-5.4 Mini measured
LMArena Vision: recognizing things1218Not measuredOnly GPT-5.4 Mini measured
LMArena Vision: creative writing1222Not measuredOnly GPT-5.4 Mini measured
Neither model has a result on the other 14 boards here
Image generationNot comparablePublic boards, shown as published, kept out of the index0 boards, none shared
Image generation benchmarks for GPT-5.4 Mini and o3 Mini
BenchmarkGPT-5.4 Minio3 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-5.4 Mini$0.0030Fits in one request
o3 Mini$0.0033Fits in one request

GPT-5.4 Mini costs less

Repository review

50K input + 3K output tokens

GPT-5.4 Mini$0.051Fits in one request
o3 Mini$0.068Fits in one request

GPT-5.4 Mini costs less

Agent loop

200K input + 10K output tokens

GPT-5.4 Mini$0.195Fits in one request
o3 Mini$0.264Exceeds the context window

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-5.4 Mini and o3 Mini
SpecificationOpenAI GPT-5.4 MiniOpenAI o3 Mini
MakerOpenAIOpenAI
WeightsNo public weights listedNo public weights listed
ReleasedMarch 17, 2026January 31, 2025
Context window400K200K
Input $/Mtok$0.75$1.10
Output $/Mtok$4.50$4.40
Coding index28.252.1
Independent measurements behind it12
Cost per solved task$0.70Not computable
SourceOpenRouter listingOpenRouter listing

Questions

Is GPT-5.4 Mini better than o3 Mini for coding?

Pick o3 Mini for coding: it scores 52.1 on the Vibe Coding Index against 28.2 for GPT-5.4 Mini. Pick GPT-5.4 Mini when the context window is larger, 400K against 200K tokens, or when what matters is LiveCodeBench (Vals AI) or SciCode, where it leads.

Which is cheaper, GPT-5.4 Mini or o3 Mini?

GPT-5.4 Mini costs $0.75 per million input tokens and $4.50 per million output tokens; o3 Mini costs $1.10 and $4.40. Cost per solved task is known for GPT-5.4 Mini only.

Which has the bigger context window, GPT-5.4 Mini or o3 Mini?

GPT-5.4 Mini, with 400K tokens against 200K.

How many benchmarks is the GPT-5.4 Mini vs o3 Mini comparison based on?

55 benchmarks have a result for both models as of October 21, 2026. GPT-5.4 Mini's coding index rests on 1 independent benchmark and o3 Mini's on 2. Where only one model has a result, the page says so instead of naming a winner.

Compare next