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GPT-5.4 Mini vs Inkling

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-5.4 Mini Replace Inkling
GPT-5.4 MiniOpenAI
Coding
28.2
Overall
24.1
Output $/M
$4.50
21
T InklingThinking Machines
Coding
49.7
Overall
25.0
Output $/M
$4.05
49
vs boards won of 72 shared, 2 tied

Decision reading

Pick Inkling for coding: it scores 49.7 on the Vibe Coding Index against 28.2 for GPT-5.4 Mini.

Pick GPT-5.4 Mini when a solved task costs $0.70 against $0.76, or when what matters is AA Coding Index or Terminal-Bench 4 (Vals AI), where it leads.

Model AGPT-5.4 MiniOpenAI28.2/1001 independent benchmark$0.70 per solved taskModel BInklingThinking Machines49.7/1002 independent benchmarks$0.76 per solved task
Shared results
72
GPT-5.4 Mini only
16
Inkling only
30
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, Inkling 49.7 from 2 benchmarks.
Widest category
Math, 9.9 points apart on average over 6 shared benchmarks.
Widest single gap
Vibe Code Bench (Vals AI): GPT-5.4 Mini 48.0% against Inkling 19.2%, 28.8 points apart on a 0 to 100 scale.
Output price
GPT-5.4 Mini $4.50 against Inkling $4.05 per million output tokens, 1.1x apart.
Context window
GPT-5.4 Mini takes 400K tokens, Inkling 524K.

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 MiniBarsInklingTies
Coding1061 tie
Intelligence11
Agentic work14
Reasoning38
Math321 tie
Knowledge09
General319
All shared boards21492 ties
CodingLike-for-likeFour of these boards feed the Vibe Coding Index106
Coding benchmarks for GPT-5.4 Mini and Inkling
BenchmarkGPT-5.4 MiniInklingLeader
LiveBench codingNot measured64.0%Only Inkling measured
LMArena WebDev13971414Inkling
AA Coding Index56.152.1GPT-5.4 Mini
LiveCodeBench (Vals AI)81.5%85.5%Inkling
SWE-bench Verified (Vals AI)73.0%77.6%Inkling
Terminal-Bench 4 (Vals AI)2.5%0.5%GPT-5.4 Mini
Vibe Code Bench (Vals AI)48.0%19.2%GPT-5.4 Mini
Code migration (Vals AI)12.9%11.8%GPT-5.4 Mini
ProgramBench (Vals AI)0.0%0.0%Tie
IOI (Vals AI)Not measured14.9%Only Inkling measured
Terminal-Bench 2.1 (Vals AI)54.7%47.6%GPT-5.4 Mini
Vibe Code Bench 1-100 (Vals AI)Not measured7.3%Only Inkling measured
SkillsBench (Vals AI)Not measured26.1%Only Inkling measured
CyberBench (Vals AI)Not measured66.8%Only Inkling measured
SciCode52.1%47.0%GPT-5.4 Mini
Terminal-Bench Hard (Artificial Analysis run)52.3%Not measuredOnly GPT-5.4 Mini measured
FrontierCode27.0%14.0%GPT-5.4 Mini
FrontierSWENot measured4.1%Only Inkling measured
WeirdML60.3%32.3%GPT-5.4 Mini
ALE-Bench1188.6946.0GPT-5.4 Mini
LMArena Text: coding14381466Inkling
LMArena Text: software and IT14361465Inkling
LMArena WebDev: React13861404Inkling
LMArena WebDev: HTML14191399GPT-5.4 Mini
Neither model has a result on the other 14 boards here
IntelligenceLike-for-likePublic boards, shown as published, kept out of the index11
Intelligence benchmarks for GPT-5.4 Mini and Inkling
BenchmarkGPT-5.4 MiniInklingLeader
AA Intelligence Index24.125.0Inkling
Epoch Capabilities Index148.7148.4GPT-5.4 Mini
Agentic workLike-for-likePublic boards, shown as published, kept out of the index14
Agentic work benchmarks for GPT-5.4 Mini and Inkling
BenchmarkGPT-5.4 MiniInklingLeader
AA Agentic Index17.922.5Inkling
Design Arena: agents building web appsNot measured1196Only Inkling measured
LiveBench researchNot measured59.9%Only Inkling measured
LiveBench browserNot measured16.0%Only Inkling measured
LiveBench long agenticNot measured14.1%Only Inkling measured
SREBench (Vals AI)Not measured0.0%Only Inkling measured
Finance Agent (Vals AI)45.4%46.6%Inkling
Tax Agent Bench (Vals AI)8.8%15.3%Inkling
Legal Research Bench (Vals AI)12.5%28.4%Inkling
Harvey's Legal Agent Benchmark (Vals AI)Not measured3.8%Only Inkling measured
Excel Modeling Benchmark (Vals AI)45.4%38.4%GPT-5.4 Mini
τ²-Bench Telecom83.3%Not measuredOnly GPT-5.4 Mini measured
APEX-AgentsNot measured33.8%Only Inkling measured
DeepResearch Bench36.3%Not measuredOnly GPT-5.4 Mini measured
Neither model has a result on the other 25 boards here
ReasoningLike-for-likePublic boards, shown as published, kept out of the index38
Reasoning benchmarks for GPT-5.4 Mini and Inkling
BenchmarkGPT-5.4 MiniInklingLeader
GPQA Diamond83.1%87.1%Inkling
LiveBench reasoningNot measured78.3%Only Inkling measured
MMMU Pro (Vals AI)79.3%78.5%GPT-5.4 Mini
GPQA Diamond (Artificial Analysis run)87.5%87.2%GPT-5.4 Mini
Humanity's Last Exam (Artificial Analysis run)28.1%31.9%Inkling
GPQA Diamond (Epoch AI run)86.9%88.3%Inkling
ARC-AGI63.7%79.5%Inkling
ARC-AGI-218.9%36.5%Inkling
SimpleBenchNot measured50.0%Only Inkling measured
Chess puzzles23.0%21.0%GPT-5.4 Mini
Mystery game puzzles11.0%Not measuredOnly GPT-5.4 Mini measured
LMArena Text: hard prompts14241451Inkling
LMArena Text: expert14351466Inkling
LMArena Text: hard prompts in English14201448Inkling
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 5 boards here
MathLike-for-likePublic boards, shown as published, kept out of the index32
Math benchmarks for GPT-5.4 Mini and Inkling
BenchmarkGPT-5.4 MiniInklingLeader
AIME95.6%Not measuredOnly GPT-5.4 Mini measured
OTIS Mock AIME88.9%88.9%Tie
FrontierMath, tiers 1 to 351.2%33.3%GPT-5.4 Mini
FrontierMath, tier 49.8%4.9%GPT-5.4 Mini
ProofBench21.0%0.0%GPT-5.4 Mini
LMArena Text: math14181479Inkling
LMArena Text: mathematical work14291460Inkling
Neither model has a result on the other 6 boards here
KnowledgeLike-for-likePublic boards, shown as published, kept out of the index09
Knowledge benchmarks for GPT-5.4 Mini and Inkling
BenchmarkGPT-5.4 MiniInklingLeader
MMLU Pro84.5%86.3%Inkling
LegalBench (Vals AI)Not measured83.0%Only Inkling measured
CaseLaw (Vals AI)51.7%Not measuredOnly GPT-5.4 Mini measured
CorpFin (Vals AI)60.9%68.6%Inkling
TaxEval (Vals AI)71.2%75.3%Inkling
MortgageTax (Vals AI)63.5%64.0%Inkling
MedCode (Vals AI)Not measured41.2%Only Inkling measured
SimpleQA Verified29.4%40.3%Inkling
LMArena Text: science14171455Inkling
LMArena Text: medicine and healthcare13951447Inkling
LMArena Text: legal and government14141448Inkling
LMArena Text: business and finance14181438Inkling
Neither model has a result on the other 5 boards here
Web designDirectional onlyPublic boards, shown as published, kept out of the index9 boards, none shared
Web design benchmarks for GPT-5.4 Mini and Inkling
BenchmarkGPT-5.4 MiniInklingLeader
Design Arena: websitesNot measured1224Only Inkling measured
Design Arena: UI componentsNot measured1200Only Inkling measured
Design Arena: game devNot measured1166Only Inkling measured
Design Arena: data vizNot measured1160Only Inkling measured
Design Arena: 3DNot measured1161Only Inkling measured
Design Arena: all code categoriesNot measured1206Only Inkling measured
Design Arena: SVGNot measured1109Only Inkling measured
Design Arena: ASCII artNot measured1089Only Inkling measured
LiveBench designNot measured58.3%Only Inkling measured
GeneralLike-for-likePublic boards, shown as published, kept out of the index319
General benchmarks for GPT-5.4 Mini and Inkling
BenchmarkGPT-5.4 MiniInklingLeader
Vals IndexNot measured29.0%Only Inkling measured
LiveBench data analysisNot measured72.8%Only Inkling measured
Public Benefits Bench (Vals AI)Not measured58.5%Only Inkling measured
SAGE (Vals AI)50.8%36.5%GPT-5.4 Mini
MedScribe (Vals AI)Not measured85.4%Only Inkling measured
Vals Multimodal Index54.2%49.4%GPT-5.4 Mini
IFBench73.3%Not measuredOnly GPT-5.4 Mini measured
Long context reasoning (AA-LCR)77.0%77.3%Inkling
DTBench80.0%87.5%Inkling
LMCA40.8%37.6%GPT-5.4 Mini
LMArena Text14121442Inkling
LMArena Text: instruction following14051425Inkling
LMArena Text: creative writing13701390Inkling
LMArena Vision1245Not measuredOnly GPT-5.4 Mini measured
LMArena Text: English14121442Inkling
LMArena Text: non-English14051434Inkling
LMArena Text: Chinese14461493Inkling
LMArena Text: German14081445Inkling
LMArena Text: Japanese13751429Inkling
LMArena Text: Korean13701403Inkling
LMArena Text: French14411455Inkling
LMArena Text: Spanish14051449Inkling
LMArena Text: Russian14171430Inkling
LMArena Text: Polish14151450Inkling
LMArena Text: multi-turn14291437Inkling
LMArena Text: longer queries14081435Inkling
LMArena Text: writing and language13931404Inkling
LMArena Text: entertainment and media13731394Inkling
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 12 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 Inkling
BenchmarkGPT-5.4 MiniInklingLeader
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
Inkling$0.0030Fits 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
Inkling$0.062Fits 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
Inkling$0.240Fits 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-5.4 Mini and Inkling
SpecificationOpenAI GPT-5.4 MiniThinking Machines Inkling
MakerOpenAIThinking Machines
WeightsNo public weights listedOpen weights
ReleasedMarch 17, 2026July 17, 2026
Context window400K524K
Input $/Mtok$0.75$1.00
Output $/Mtok$4.50$4.05
Coding index28.249.7
Independent measurements behind it12
Cost per solved task$0.70$0.76
SourceOpenRouter listingOpenRouter listing

Questions

Is GPT-5.4 Mini better than Inkling for coding?

Pick Inkling for coding: it scores 49.7 on the Vibe Coding Index against 28.2 for GPT-5.4 Mini. Pick GPT-5.4 Mini when a solved task costs $0.70 against $0.76, or when what matters is AA Coding Index or Terminal-Bench 4 (Vals AI), where it leads.

Which is cheaper, GPT-5.4 Mini or Inkling?

GPT-5.4 Mini costs $0.75 per million input tokens and $4.50 per million output tokens; Inkling costs $1.00 and $4.05. Per solved SWE-bench Verified task, GPT-5.4 Mini costs $0.70 and Inkling $0.76.

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

Inkling, with 524K tokens against 400K.

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

72 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 Inkling's on 2. Where only one model has a result, the page says so instead of naming a winner.

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