Enter opens the highlighted result. Esc closes.

GPT-5 Mini vs Grok 4.5

Grok 4.5 leads GPT-5 Mini on coding, 58.6 to 34.2 on the Vibe Coding Index, and GPT-5 Mini costs 3.0x less per output token ($2.00 vs $6.00 per million). Updated October 22, 2026; 78 benchmarks have a result for both.

Replace GPT-5 Mini Replace Grok 4.5
GPT-5 MiniOpenAI
Coding
34.2
Overall
43.7
Output $/M
$2.00
5
Grok 4.5xAI
Coding
58.6
Overall
62.1
Output $/M
$6.00
73
vs boards won of 78 shared

GPT-5 Mini or Grok 4.5: which to pick

Pick Grok 4.5 for coding: it scores 58.6 on the Vibe Coding Index against 34.2 for GPT-5 Mini.

Pick GPT-5 Mini for output tokens 3.0x cheaper ($2.00 vs $6.00 per million) and a lower cost per solved task ($0.08 against $0.62).

Model AGPT-5 MiniOpenAI34.2/1002 independent benchmarks$0.08 per solved taskModel BGrok 4.5xAI58.6/1006 independent benchmarks$0.62 per solved task
Shared results
78
GPT-5 Mini only
23
Grok 4.5 only
45
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 Mini 34.2 from 2 benchmarks, Grok 4.5 58.6 from 6 benchmarks.
Widest category
Agentic work, 24.3 points apart on average over 1 shared benchmark.
Widest single gap
Vibe Code Bench (Vals AI): GPT-5 Mini 14.2% against Grok 4.5 69.0%, 54.8 points apart on a 0 to 100 scale.
Output price
GPT-5 Mini $2.00 against Grok 4.5 $6.00 per million output tokens, 3.0x apart.
Context window
GPT-5 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 MiniBarsGrok 4.5Ties
Coding16
Intelligence02
Agentic work01
Reasoning113
Math06
Knowledge210
Web design08
General127
All shared boards573
CodingLike-for-likeSix of these boards feed the Vibe Coding Index16
Coding benchmarks for GPT-5 Mini and Grok 4.5
BenchmarkGPT-5 MiniGrok 4.5Leader
SWE-bench Verified59.8%Not measuredOnly GPT-5 Mini measured
SWE-bench Multilingual39.7%Not measuredOnly GPT-5 Mini measured
LiveBench codingNot measured94.3%Only Grok 4.5 measured
LMArena WebDevNot measured1553Only Grok 4.5 measured
AA Coding IndexNot measured72.4Only Grok 4.5 measured
LiveCodeBench (Vals AI)86.6%87.3%Grok 4.5
SWE-bench Verified (Vals AI)60.8%86.6%Grok 4.5
Terminal-Bench 4 (Vals AI)Not measured8.6%Only Grok 4.5 measured
Vibe Code Bench (Vals AI)14.2%69.0%Grok 4.5
Code migration (Vals AI)Not measured36.6%Only Grok 4.5 measured
ProgramBench (Vals AI)Not measured0.0%Only Grok 4.5 measured
IOI (Vals AI)Not measured40.6%Only Grok 4.5 measured
Terminal-Bench 2.1 (Vals AI)Not measured67.8%Only Grok 4.5 measured
SkillsBench (Vals AI)Not measured66.0%Only Grok 4.5 measured
CyberBench (Vals AI)Not measured71.0%Only Grok 4.5 measured
LiveCodeBench (Artificial Analysis run)83.8%Not measuredOnly GPT-5 Mini measured
SciCode39.0%55.0%Grok 4.5
Terminal-Bench Hard (Artificial Analysis run)33.3%Not measuredOnly GPT-5 Mini measured
Terminal-Bench34.8%Not measuredOnly GPT-5 Mini measured
FrontierCodeNot measured42.4%Only Grok 4.5 measured
WeirdML52.7%46.4%GPT-5 Mini
ALE-BenchNot measured1309.3Only Grok 4.5 measured
LMArena Text: coding14061474Grok 4.5
LMArena Text: software and IT13941471Grok 4.5
LMArena WebDev: ReactNot measured1556Only Grok 4.5 measured
LMArena WebDev: HTMLNot measured1567Only Grok 4.5 measured
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 11 boards here
IntelligenceLike-for-likePublic boards, shown as published, kept out of the index02
Intelligence benchmarks for GPT-5 Mini and Grok 4.5
BenchmarkGPT-5 MiniGrok 4.5Leader
AA Intelligence Index20.638.8Grok 4.5
Epoch Capabilities Index145.3154.1Grok 4.5
Agentic workLike-for-likePublic boards, shown as published, kept out of the index01
Agentic work benchmarks for GPT-5 Mini and Grok 4.5
BenchmarkGPT-5 MiniGrok 4.5Leader
AA Agentic IndexNot measured41.2Only Grok 4.5 measured
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 measured1220Only Grok 4.5 measured
Design Arena: agents building Android appsNot measured1236Only 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 measured1205Only Grok 4.5 measured
Design Arena: PowerPoint slidesNot measured1230Only 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)Not measured48.4%Only Grok 4.5 measured
Tax Agent Bench (Vals AI)Not measured24.9%Only Grok 4.5 measured
Legal Research Bench (Vals AI)Not measured38.0%Only Grok 4.5 measured
Excel Modeling Benchmark (Vals AI)Not measured52.9%Only Grok 4.5 measured
Time Horizon Index (Vals AI)Not measured6.3%Only Grok 4.5 measured
τ²-Bench Telecom71.1%Not measuredOnly GPT-5 Mini measured
APEX-AgentsNot measured56.2%Only Grok 4.5 measured
PostTrainBenchNot measured23.4%Only Grok 4.5 measured
Vending-Bench 2-$31$3,887Grok 4.5
LMArena SearchNot measured1216Only Grok 4.5 measured
Berkeley Function Calling Leaderboard (BFCL)55.5%Not measuredOnly GPT-5 Mini 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 Mini and Grok 4.5
BenchmarkGPT-5 MiniGrok 4.5Leader
GPQA Diamond80.3%92.9%Grok 4.5
LiveBench reasoningNot measured87.2%Only Grok 4.5 measured
MMMU Pro (Vals AI)78.9%61.8%GPT-5 Mini
GPQA Diamond (Artificial Analysis run)82.8%93.1%Grok 4.5
Humanity's Last Exam (Artificial Analysis run)21.5%42.7%Grok 4.5
GPQA Diamond (Epoch AI run)75.0%93.4%Grok 4.5
ARC-AGI54.3%87.2%Grok 4.5
ARC-AGI-24.4%52.6%Grok 4.5
SimpleBenchNot measured70.0%Only Grok 4.5 measured
Chess puzzles24.0%35.0%Grok 4.5
Mystery game puzzles10.0%Not measuredOnly GPT-5 Mini measured
VPCT40.2%Not measuredOnly GPT-5 Mini measured
LMArena Text: hard prompts13801462Grok 4.5
LMArena Text: expert13791465Grok 4.5
LMArena Text: hard prompts in English13831464Grok 4.5
LMArena Vision: diagrams12021304Grok 4.5
LMArena Vision: homework12101295Grok 4.5
Kagi LLM Benchmark70.3%83.5%Grok 4.5
Neither model has a result on the other 4 boards here
MathLike-for-likePublic boards, shown as published, kept out of the index06
Math benchmarks for GPT-5 Mini and Grok 4.5
BenchmarkGPT-5 MiniGrok 4.5Leader
AIME91.5%Not measuredOnly GPT-5 Mini measured
MATH 500 (Vals AI)94.8%Not measuredOnly GPT-5 Mini measured
MGSM (Vals AI)92.6%Not measuredOnly GPT-5 Mini measured
AA Math Index90.7Not measuredOnly GPT-5 Mini measured
AIME 2025 (Artificial Analysis run)90.7%Not measuredOnly GPT-5 Mini measured
OTIS Mock AIME86.7%97.8%Grok 4.5
FrontierMath, tiers 1 to 346.7%57.2%Grok 4.5
FrontierMath, tier 412.2%24.4%Grok 4.5
ProofBench9.0%31.0%Grok 4.5
MATH level 597.8%Not measuredOnly GPT-5 Mini measured
LMArena Text: math13781460Grok 4.5
LMArena Text: mathematical work13801482Grok 4.5
Neither model has a result on the other 1 board here
KnowledgeLike-for-likePublic boards, shown as published, kept out of the index210
Knowledge benchmarks for GPT-5 Mini and Grok 4.5
BenchmarkGPT-5 MiniGrok 4.5Leader
MMLU Pro82.2%89.2%Grok 4.5
LegalBench (Vals AI)81.8%86.0%Grok 4.5
CaseLaw (Vals AI)68.5%Not measuredOnly GPT-5 Mini measured
CorpFin (Vals AI)60.2%67.4%Grok 4.5
TaxEval (Vals AI)75.2%71.7%GPT-5 Mini
MortgageTax (Vals AI)66.9%61.8%GPT-5 Mini
MedQA (Vals AI)96.1%Not measuredOnly GPT-5 Mini measured
MedCode (Vals AI)43.0%43.3%Grok 4.5
MMLU Pro (Artificial Analysis run)83.7%Not measuredOnly GPT-5 Mini measured
SimpleQA Verified21.6%48.3%Grok 4.5
LMArena Text: science13711464Grok 4.5
LMArena Text: medicine and healthcare13801440Grok 4.5
LMArena Text: legal and government13751463Grok 4.5
LMArena Text: business and finance13581441Grok 4.5
FACTS Benchmark Suite38.6%50.2%Grok 4.5
Neither model has a result on the other 3 boards here
Web designLike-for-likePublic boards, shown as published, kept out of the index08
Web design benchmarks for GPT-5 Mini and Grok 4.5
BenchmarkGPT-5 MiniGrok 4.5Leader
Design Arena: websites11251281Grok 4.5
Design Arena: UI components11031280Grok 4.5
Design Arena: game dev11291264Grok 4.5
Design Arena: data viz11311266Grok 4.5
Design Arena: 3D10361257Grok 4.5
Design Arena: all code categories11141275Grok 4.5
Design Arena: SVG10911215Grok 4.5
Design Arena: ASCII art11251256Grok 4.5
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 Mini and Grok 4.5
BenchmarkGPT-5 MiniGrok 4.5Leader
LiveBench data analysisNot measured73.0%Only Grok 4.5 measured
SAGE (Vals AI)43.0%35.0%GPT-5 Mini
MedScribe (Vals AI)80.6%86.9%Grok 4.5
Vals Multimodal IndexNot measured63.4%Only Grok 4.5 measured
IFBench75.4%Not measuredOnly GPT-5 Mini measured
Long context reasoning (AA-LCR)72.3%79.3%Grok 4.5
DTBench80.5%96.5%Grok 4.5
LMCA34.2%45.2%Grok 4.5
Fiction.LiveBench69.4%Not measuredOnly GPT-5 Mini measured
Creative writing (Lech Mazur)83.1%Not measuredOnly GPT-5 Mini measured
Surface Evolver BenchNot measured74.4%Only Grok 4.5 measured
Furniture assemblyNot measured22.5%Only Grok 4.5 measured
LMArena Text13731448Grok 4.5
LMArena Text: instruction following13571445Grok 4.5
LMArena Text: creative writing13251442Grok 4.5
LMArena Vision12021287Grok 4.5
LMArena Text: English13791453Grok 4.5
LMArena Text: non-English13631440Grok 4.5
LMArena Text: Chinese13861495Grok 4.5
LMArena Text: German13661448Grok 4.5
LMArena Text: Japanese13411430Grok 4.5
LMArena Text: Korean13081406Grok 4.5
LMArena Text: French13861457Grok 4.5
LMArena Text: Spanish13541451Grok 4.5
LMArena Text: Russian13621449Grok 4.5
LMArena Text: Polish13781432Grok 4.5
LMArena Text: multi-turn13631456Grok 4.5
LMArena Text: longer queries13551462Grok 4.5
LMArena Text: writing and language13441445Grok 4.5
LMArena Text: entertainment and media13401434Grok 4.5
LMArena Vision: English12161285Grok 4.5
LMArena Vision: Chinese12141345Grok 4.5
LMArena Vision: reading text11991293Grok 4.5
LMArena Vision: humor12051276Grok 4.5
LMArena Vision: captioning1217Not measuredOnly GPT-5 Mini measured
LMArena Vision: recognizing things1226Not measuredOnly GPT-5 Mini measured
LMArena Vision: creative writing11811293Grok 4.5
LMArena DocumentNot measured1452Only Grok 4.5 measured
Neither model has a result on the other 8 boards here
Image generationNot comparablePublic boards, shown as published, kept out of the index0 boards, none shared
Image generation benchmarks for GPT-5 Mini and Grok 4.5
BenchmarkGPT-5 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 Mini$0.0013Fits in one request
Grok 4.5$0.0050Fits in one request

GPT-5 Mini costs less

Repository review

50K input + 3K output tokens

GPT-5 Mini$0.018Fits in one request
Grok 4.5$0.118Fits in one request

GPT-5 Mini costs less

Agent loop

200K input + 10K output tokens

GPT-5 Mini$0.070Fits in one request
Grok 4.5$0.460Fits 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 Mini and Grok 4.5
SpecificationOpenAI GPT-5 MiniSpaceXAI Grok 4.5
MakerOpenAIxAI
WeightsNo public weights listedNo public weights listed
ReleasedAugust 7, 2025July 8, 2026
Context window400K500K
Input $/Mtok$0.25$2.00
Output $/Mtok$2.00$6.00
Coding index34.258.6
Independent measurements behind it26
Cost per solved task$0.08$0.62
SourceOpenRouter listingOpenRouter listing

Questions

Is GPT-5 Mini better than Grok 4.5 for coding?

Pick Grok 4.5 for coding: it scores 58.6 on the Vibe Coding Index against 34.2 for GPT-5 Mini. Pick GPT-5 Mini for output tokens 3.0x cheaper ($2.00 vs $6.00 per million) and a lower cost per solved task ($0.08 against $0.62).

Which is cheaper, GPT-5 Mini or Grok 4.5?

GPT-5 Mini costs $0.25 per million input tokens and $2.00 per million output tokens; Grok 4.5 costs $2.00 and $6.00. Per solved SWE-bench Verified task, GPT-5 Mini costs $0.08 and Grok 4.5 $0.62.

Which has the bigger context window, GPT-5 Mini or Grok 4.5?

Grok 4.5, with 500K tokens against 400K.

How many benchmarks is the GPT-5 Mini vs Grok 4.5 comparison based on?

78 benchmarks have a result for both models as of October 22, 2026. GPT-5 Mini's coding index rests on 2 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.

Compare next

Embed this comparison on your site

Free under CC BY 4.0, while the source link stays visible. Preview the frame · Terms and other embeds

<iframe src="https://llmbenchmark.ai/embed/compare/gpt-5-mini-vs-grok-4-5" title="GPT-5 Mini vs Grok 4.5, LLMBenchmark.ai" width="100%" height="360" style="border:0;max-width:100%" loading="lazy"></iframe>
<p style="font:13px/1.4 sans-serif;margin:6px 0 0">Source: <a href="https://llmbenchmark.ai/compare/gpt-5-mini-vs-grok-4-5">LLMBenchmark.ai, GPT-5 Mini vs Grok 4.5</a></p>