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GPT-5.4 Mini vs Grok 4.5

Grok 4.5 leads GPT-5.4 Mini on coding, 58.6 to 35.8 on the Vibe Coding Index, and GPT-5.4 Mini costs 1.3x less per output token ($4.50 vs $6.00 per million). Updated October 21, 2026; 81 benchmarks have a result for both.

Replace GPT-5.4 Mini Replace Grok 4.5
GPT-5.4 MiniOpenAI
Coding
35.8
Overall
44.0
Output $/M
$4.50
4
Grok 4.5xAI
Coding
58.6
Overall
62.1
Output $/M
$6.00
76
vs boards won of 81 shared, 1 tied

GPT-5.4 Mini or Grok 4.5: which to pick

Pick Grok 4.5 for coding: it scores 58.6 on the Vibe Coding Index against 35.8 for GPT-5.4 Mini.

Pick GPT-5.4 Mini for output tokens 1.3x cheaper ($4.50 vs $6.00 per million) and work measured by WeirdML or MMMU Pro (Vals AI), where it leads.

Model AGPT-5.4 MiniOpenAI35.8/1005 independent benchmarks$0.70 per solved taskModel BGrok 4.5xAI58.6/1006 independent benchmarks$0.62 per solved task
Shared results
81
GPT-5.4 Mini only
8
Grok 4.5 only
42
Like-for-like categories
7 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-5.4 Mini 35.8 from 5 benchmarks, Grok 4.5 58.6 from 6 benchmarks.
Widest category
Agentic work, 15.1 points apart on average over 5 shared benchmarks.
Widest single gap
Kagi LLM Benchmark: GPT-5.4 Mini 37.9% against Grok 4.5 83.5%, 45.6 points apart on a 0 to 100 scale.
Output price
GPT-5.4 Mini $4.50 against Grok 4.5 $6.00 per million output tokens, 1.3x apart.
Context window
GPT-5.4 Mini takes 400K tokens, Grok 4.5 500K.

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 MiniBarsGrok 4.5Ties
Coding1151 tie
Intelligence02
Agentic work05
Reasoning113
Math06
Knowledge18
General127
All shared boards4761 tie
CodingLike-for-likeSix of these boards feed the Vibe Coding Index115
Coding benchmarks for GPT-5.4 Mini and Grok 4.5
BenchmarkGPT-5.4 MiniGrok 4.5Leader
LiveBench codingNot measured94.3%Only Grok 4.5 measured
LMArena WebDev13971553Grok 4.5
AA Coding Index56.172.4Grok 4.5
LiveCodeBench (Vals AI)81.5%87.3%Grok 4.5
SWE-bench Verified (Vals AI)73.0%86.6%Grok 4.5
Terminal-Bench 4 (Vals AI)2.5%8.6%Grok 4.5
Vibe Code Bench (Vals AI)48.0%69.0%Grok 4.5
Code migration (Vals AI)12.9%36.6%Grok 4.5
ProgramBench (Vals AI)0.0%0.0%Tie
IOI (Vals AI)Not measured40.6%Only Grok 4.5 measured
Terminal-Bench 2.1 (Vals AI)54.7%67.8%Grok 4.5
SkillsBench (Vals AI)Not measured66.0%Only Grok 4.5 measured
CyberBench (Vals AI)Not measured71.0%Only Grok 4.5 measured
SciCode52.1%55.0%Grok 4.5
Terminal-Bench Hard (Artificial Analysis run)52.3%Not measuredOnly GPT-5.4 Mini measured
FrontierCode27.0%42.4%Grok 4.5
WeirdML60.3%46.4%GPT-5.4 Mini
ALE-Bench1188.61309.3Grok 4.5
LMArena Text: coding14381474Grok 4.5
LMArena Text: software and IT14361471Grok 4.5
LMArena WebDev: React13861556Grok 4.5
LMArena WebDev: HTML14191567Grok 4.5
LMArena WebDev: from an imageNot measured1562Only Grok 4.5 measured
SciCodeNot measured6.5%Only Grok 4.5 measured
Neither model has a result on the other 15 boards here
IntelligenceLike-for-likePublic boards, shown as published, kept out of the index02
Intelligence benchmarks for GPT-5.4 Mini and Grok 4.5
BenchmarkGPT-5.4 MiniGrok 4.5Leader
AA Intelligence Index24.138.8Grok 4.5
Epoch Capabilities Index148.7154.1Grok 4.5
Agentic workLike-for-likePublic boards, shown as published, kept out of the index05
Agentic work benchmarks for GPT-5.4 Mini and Grok 4.5
BenchmarkGPT-5.4 MiniGrok 4.5Leader
AA Agentic Index17.941.2Grok 4.5
Design Arena: agents building web appsNot measured1218Only Grok 4.5 measured
Design Arena: agents building full-stack appsNot measured1249Only Grok 4.5 measured
Design Arena: agents building mobile appsNot measured1221Only Grok 4.5 measured
Design Arena: agents building Android appsNot measured1242Only Grok 4.5 measured
Design Arena: agents building Godot gamesNot measured1229Only Grok 4.5 measured
Design Arena: agents building gamesNot measured1236Only Grok 4.5 measured
Design Arena: HTML slidesNot measured1204Only Grok 4.5 measured
Design Arena: PowerPoint slidesNot measured1233Only Grok 4.5 measured
LiveBench researchNot measured85.9%Only Grok 4.5 measured
LiveBench browserNot measured44.0%Only Grok 4.5 measured
LiveBench long agenticNot measured27.9%Only Grok 4.5 measured
SREBench (Vals AI)Not measured0.8%Only Grok 4.5 measured
Finance Agent (Vals AI)45.4%48.4%Grok 4.5
Tax Agent Bench (Vals AI)8.8%24.9%Grok 4.5
Legal Research Bench (Vals AI)12.5%38.0%Grok 4.5
Excel Modeling Benchmark (Vals AI)45.4%52.9%Grok 4.5
Time Horizon Index (Vals AI)Not measured6.3%Only Grok 4.5 measured
τ²-Bench Telecom83.3%Not measuredOnly GPT-5.4 Mini measured
APEX-AgentsNot measured56.2%Only Grok 4.5 measured
DeepResearch Bench36.3%Not measuredOnly GPT-5.4 Mini measured
PostTrainBenchNot measured23.4%Only Grok 4.5 measured
Vending-Bench 2Not measured$3,887Only Grok 4.5 measured
LMArena SearchNot measured1216Only Grok 4.5 measured
Neither model has a result on the other 17 boards here
ReasoningLike-for-likePublic boards, shown as published, kept out of the index113
Reasoning benchmarks for GPT-5.4 Mini and Grok 4.5
BenchmarkGPT-5.4 MiniGrok 4.5Leader
GPQA Diamond83.1%92.9%Grok 4.5
LiveBench reasoningNot measured87.2%Only Grok 4.5 measured
MMMU Pro (Vals AI)79.3%61.8%GPT-5.4 Mini
GPQA Diamond (Artificial Analysis run)87.5%93.1%Grok 4.5
Humanity's Last Exam (Artificial Analysis run)28.1%42.7%Grok 4.5
GPQA Diamond (Epoch AI run)86.9%93.4%Grok 4.5
ARC-AGI63.7%87.2%Grok 4.5
ARC-AGI-218.9%52.6%Grok 4.5
SimpleBenchNot measured70.0%Only Grok 4.5 measured
Chess puzzles23.0%35.0%Grok 4.5
Mystery game puzzles11.0%Not measuredOnly GPT-5.4 Mini measured
LMArena Text: hard prompts14241462Grok 4.5
LMArena Text: expert14351465Grok 4.5
LMArena Text: hard prompts in English14201464Grok 4.5
LMArena Vision: diagrams12661304Grok 4.5
LMArena Vision: homework12851295Grok 4.5
Kagi LLM Benchmark37.9%83.5%Grok 4.5
Neither model has a result on the other 5 boards here
MathLike-for-likePublic boards, shown as published, kept out of the index06
Math benchmarks for GPT-5.4 Mini and Grok 4.5
BenchmarkGPT-5.4 MiniGrok 4.5Leader
AIME95.6%Not measuredOnly GPT-5.4 Mini measured
OTIS Mock AIME88.9%97.8%Grok 4.5
FrontierMath, tiers 1 to 351.2%57.2%Grok 4.5
FrontierMath, tier 49.8%24.4%Grok 4.5
ProofBench21.0%31.0%Grok 4.5
LMArena Text: math14181460Grok 4.5
LMArena Text: mathematical work14291482Grok 4.5
Neither model has a result on the other 6 boards here
KnowledgeLike-for-likePublic boards, shown as published, kept out of the index18
Knowledge benchmarks for GPT-5.4 Mini and Grok 4.5
BenchmarkGPT-5.4 MiniGrok 4.5Leader
MMLU Pro84.5%89.2%Grok 4.5
LegalBench (Vals AI)Not measured86.0%Only Grok 4.5 measured
CaseLaw (Vals AI)51.7%Not measuredOnly GPT-5.4 Mini measured
CorpFin (Vals AI)60.9%67.4%Grok 4.5
TaxEval (Vals AI)71.2%71.7%Grok 4.5
MortgageTax (Vals AI)63.5%61.8%GPT-5.4 Mini
MedCode (Vals AI)Not measured43.3%Only Grok 4.5 measured
SimpleQA Verified29.4%48.3%Grok 4.5
LMArena Text: science14171464Grok 4.5
LMArena Text: medicine and healthcare13951440Grok 4.5
LMArena Text: legal and government14141463Grok 4.5
LMArena Text: business and finance14181441Grok 4.5
FACTS Benchmark SuiteNot measured50.2%Only Grok 4.5 measured
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 Grok 4.5
BenchmarkGPT-5.4 MiniGrok 4.5Leader
Design Arena: websitesNot measured1281Only Grok 4.5 measured
Design Arena: UI componentsNot measured1279Only Grok 4.5 measured
Design Arena: game devNot measured1263Only Grok 4.5 measured
Design Arena: data vizNot measured1266Only Grok 4.5 measured
Design Arena: 3DNot measured1257Only Grok 4.5 measured
Design Arena: all code categoriesNot measured1275Only Grok 4.5 measured
Design Arena: SVGNot measured1215Only Grok 4.5 measured
Design Arena: ASCII artNot measured1257Only Grok 4.5 measured
LiveBench designNot measured78.1%Only Grok 4.5 measured
GeneralLike-for-likePublic boards, shown as published, kept out of the index127
General benchmarks for GPT-5.4 Mini and Grok 4.5
BenchmarkGPT-5.4 MiniGrok 4.5Leader
LiveBench data analysisNot measured73.0%Only Grok 4.5 measured
SAGE (Vals AI)50.8%35.0%GPT-5.4 Mini
MedScribe (Vals AI)Not measured86.9%Only Grok 4.5 measured
Vals Multimodal Index54.2%63.4%Grok 4.5
IFBench73.3%Not measuredOnly GPT-5.4 Mini measured
Long context reasoning (AA-LCR)77.0%79.3%Grok 4.5
DTBench80.0%96.5%Grok 4.5
LMCA40.8%45.2%Grok 4.5
Surface Evolver BenchNot measured74.4%Only Grok 4.5 measured
Furniture assemblyNot measured22.5%Only Grok 4.5 measured
LMArena Text14121448Grok 4.5
LMArena Text: instruction following14051445Grok 4.5
LMArena Text: creative writing13701442Grok 4.5
LMArena Vision12451287Grok 4.5
LMArena Text: English14121453Grok 4.5
LMArena Text: non-English14051440Grok 4.5
LMArena Text: Chinese14461495Grok 4.5
LMArena Text: German14081448Grok 4.5
LMArena Text: Japanese13751430Grok 4.5
LMArena Text: Korean13701406Grok 4.5
LMArena Text: French14411457Grok 4.5
LMArena Text: Spanish14051451Grok 4.5
LMArena Text: Russian14171449Grok 4.5
LMArena Text: Polish14151432Grok 4.5
LMArena Text: multi-turn14291456Grok 4.5
LMArena Text: longer queries14081462Grok 4.5
LMArena Text: writing and language13931445Grok 4.5
LMArena Text: entertainment and media13731434Grok 4.5
LMArena Vision: English12441285Grok 4.5
LMArena Vision: Chinese12861345Grok 4.5
LMArena Vision: reading text12531293Grok 4.5
LMArena Vision: humor12351276Grok 4.5
LMArena Vision: recognizing things1218Not measuredOnly GPT-5.4 Mini measured
LMArena Vision: creative writing12221293Grok 4.5
LMArena DocumentNot measured1452Only Grok 4.5 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-5.4 Mini and Grok 4.5
BenchmarkGPT-5.4 MiniGrok 4.5Leader
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
Grok 4.5$0.0050Fits 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
Grok 4.5$0.118Fits 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
Grok 4.5$0.460Fits 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 Grok 4.5
SpecificationOpenAI GPT-5.4 MiniSpaceXAI Grok 4.5
MakerOpenAIxAI
WeightsNo public weights listedNo public weights listed
ReleasedMarch 17, 2026July 8, 2026
Context window400K500K
Input $/Mtok$0.75$2.00
Output $/Mtok$4.50$6.00
Coding index35.858.6
Independent measurements behind it56
Cost per solved task$0.70$0.62
SourceOpenRouter listingOpenRouter listing

Questions

Is GPT-5.4 Mini better than Grok 4.5 for coding?

Pick Grok 4.5 for coding: it scores 58.6 on the Vibe Coding Index against 35.8 for GPT-5.4 Mini. Pick GPT-5.4 Mini for output tokens 1.3x cheaper ($4.50 vs $6.00 per million) and work measured by WeirdML or MMMU Pro (Vals AI), where it leads.

Which is cheaper, GPT-5.4 Mini or Grok 4.5?

GPT-5.4 Mini costs $0.75 per million input tokens and $4.50 per million output tokens; Grok 4.5 costs $2.00 and $6.00. Per solved SWE-bench Verified task, GPT-5.4 Mini costs $0.70 and Grok 4.5 $0.62.

Which has the bigger context window, GPT-5.4 Mini or Grok 4.5?

Grok 4.5, with 500K tokens against 400K.

How many benchmarks is the GPT-5.4 Mini vs Grok 4.5 comparison based on?

81 benchmarks have a result for both models as of October 21, 2026. GPT-5.4 Mini's coding index rests on 5 independent benchmarks and Grok 4.5's on 6. Where only one model has a result, the page says so instead of naming a winner.

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