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GPT-4.1 Nano vs Grok 4.5

Grok 4.5 leads GPT-4.1 Nano on the Artificial Analysis Intelligence Index, 38.8 to 7.8, and GPT-4.1 Nano costs 15.0x less per output token ($0.40 vs $6.00 per million). Updated October 22, 2026; 56 benchmarks have a result for both.

Replace GPT-4.1 Nano Replace Grok 4.5
GPT-4.1 NanoOpenAI
Coding
No data
Overall
24.7
Output $/M
$0.40
0
Grok 4.5xAI
Coding
58.6
Overall
62.1
Output $/M
$6.00
56
vs boards won of 56 shared

GPT-4.1 Nano or Grok 4.5: which to pick

Only Grok 4.5 has a coding score, 58.6 on the Vibe Coding Index; GPT-4.1 Nano has none, so the two cannot be ranked on coding.

Pick GPT-4.1 Nano for output tokens 15.0x cheaper ($0.40 vs $6.00 per million) and a larger context window (1.05M against 500K tokens).

Model AGPT-4.1 NanoOpenAINot benchmarkedNo coding benchmarkNo cost per solved taskModel BGrok 4.5xAI58.6/1006 independent benchmarks$0.62 per solved task
Shared results
56
GPT-4.1 Nano only
15
Grok 4.5 only
67
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-4.1 Nano not benchmarked, Grok 4.5 58.6 from 6 benchmarks.
Widest category
Math, 44.8 points apart on average over 3 shared benchmarks.
Widest single gap
ARC-AGI: GPT-4.1 Nano 0.0% against Grok 4.5 87.2%, 87.2 points apart on a 0 to 100 scale.
Output price
GPT-4.1 Nano $0.40 against Grok 4.5 $6.00 per million output tokens, 15.0x apart.
Context window
GPT-4.1 Nano takes 1.05M 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-4.1 NanoBarsGrok 4.5Ties
Coding05
Intelligence02
Reasoning012
Math03
Knowledge010
Web design06
General018
All shared boards056
CodingLike-for-likeSix of these boards feed the Vibe Coding Index05
Coding benchmarks for GPT-4.1 Nano and Grok 4.5
BenchmarkGPT-4.1 NanoGrok 4.5Leader
Aider polyglot8.9%Not measuredOnly GPT-4.1 Nano measured
LiveBench codingNot measured94.3%Only Grok 4.5 measured
LMArena WebDevNot measured1553Only Grok 4.5 measured
AA Coding Index11.172.4Grok 4.5
LiveCodeBench (Vals AI)42.7%87.3%Grok 4.5
SWE-bench Verified (Vals AI)Not measured86.6%Only Grok 4.5 measured
Terminal-Bench 4 (Vals AI)Not measured8.6%Only Grok 4.5 measured
Vibe Code Bench (Vals AI)Not measured69.0%Only Grok 4.5 measured
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)32.6%Not measuredOnly GPT-4.1 Nano measured
SciCodeNot measured55.0%Only Grok 4.5 measured
Terminal-Bench Hard (Artificial Analysis run)3.8%Not measuredOnly GPT-4.1 Nano measured
FrontierCodeNot measured42.4%Only Grok 4.5 measured
WeirdML19.0%46.4%Grok 4.5
ALE-BenchNot measured1309.3Only Grok 4.5 measured
LMArena Text: coding13061474Grok 4.5
LMArena Text: software and IT13051471Grok 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 13 boards here
IntelligenceLike-for-likePublic boards, shown as published, kept out of the index02
Intelligence benchmarks for GPT-4.1 Nano and Grok 4.5
BenchmarkGPT-4.1 NanoGrok 4.5Leader
AA Intelligence Index7.838.8Grok 4.5
Epoch Capabilities Index129.5154.1Grok 4.5
Agentic workDirectional onlyPublic boards, shown as published, kept out of the index24 boards, none shared
Agentic work benchmarks for GPT-4.1 Nano and Grok 4.5
BenchmarkGPT-4.1 NanoGrok 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 Telecom17.3%Not measuredOnly GPT-4.1 Nano measured
APEX-AgentsNot measured56.2%Only Grok 4.5 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
Berkeley Function Calling Leaderboard (BFCL)33.1%Not measuredOnly GPT-4.1 Nano measured
Neither model has a result on the other 17 boards here
ReasoningLike-for-likePublic boards, shown as published, kept out of the index012
Reasoning benchmarks for GPT-4.1 Nano and Grok 4.5
BenchmarkGPT-4.1 NanoGrok 4.5Leader
GPQA Diamond50.8%92.9%Grok 4.5
LiveBench reasoningNot measured87.2%Only Grok 4.5 measured
MMMU Pro (Vals AI)55.0%61.8%Grok 4.5
GPQA Diamond (Artificial Analysis run)51.2%93.1%Grok 4.5
Humanity's Last Exam (Artificial Analysis run)3.8%42.7%Grok 4.5
GPQA Diamond (Epoch AI run)48.9%93.4%Grok 4.5
ARC-AGI0.0%87.2%Grok 4.5
ARC-AGI-20.0%52.6%Grok 4.5
SimpleBenchNot measured70.0%Only Grok 4.5 measured
Chess puzzles0.0%35.0%Grok 4.5
LMArena Text: hard prompts12861462Grok 4.5
LMArena Text: expert12711465Grok 4.5
LMArena Text: hard prompts in English12931464Grok 4.5
LMArena Vision: diagramsNot measured1304Only Grok 4.5 measured
LMArena Vision: homeworkNot measured1295Only Grok 4.5 measured
Kagi LLM Benchmark33.3%83.5%Grok 4.5
Neither model has a result on the other 6 boards here
MathLike-for-likePublic boards, shown as published, kept out of the index03
Math benchmarks for GPT-4.1 Nano and Grok 4.5
BenchmarkGPT-4.1 NanoGrok 4.5Leader
AIME26.5%Not measuredOnly GPT-4.1 Nano measured
MATH 500 (Vals AI)80.2%Not measuredOnly GPT-4.1 Nano measured
MGSM (Vals AI)69.3%Not measuredOnly GPT-4.1 Nano measured
AA Math Index24.0Not measuredOnly GPT-4.1 Nano measured
AIME 2025 (Artificial Analysis run)24.0%Not measuredOnly GPT-4.1 Nano measured
OTIS Mock AIME28.9%97.8%Grok 4.5
FrontierMath, tiers 1 to 3Not measured57.2%Only Grok 4.5 measured
FrontierMath, tier 4Not measured24.4%Only Grok 4.5 measured
ProofBenchNot measured31.0%Only Grok 4.5 measured
MATH level 570.0%Not measuredOnly GPT-4.1 Nano measured
LMArena Text: math12741460Grok 4.5
LMArena Text: mathematical work12741482Grok 4.5
Neither model has a result on the other 1 board here
KnowledgeLike-for-likePublic boards, shown as published, kept out of the index010
Knowledge benchmarks for GPT-4.1 Nano and Grok 4.5
BenchmarkGPT-4.1 NanoGrok 4.5Leader
MMLU Pro63.5%89.2%Grok 4.5
LegalBench (Vals AI)61.1%86.0%Grok 4.5
CorpFin (Vals AI)42.1%67.4%Grok 4.5
TaxEval (Vals AI)60.8%71.7%Grok 4.5
MortgageTax (Vals AI)52.8%61.8%Grok 4.5
MedQA (Vals AI)68.2%Not measuredOnly GPT-4.1 Nano measured
MedCode (Vals AI)Not measured43.3%Only Grok 4.5 measured
MMLU Pro (Artificial Analysis run)65.7%Not measuredOnly GPT-4.1 Nano measured
SimpleQA Verified6.0%48.3%Grok 4.5
LMArena Text: science12971464Grok 4.5
LMArena Text: medicine and healthcare12761440Grok 4.5
LMArena Text: legal and government13001463Grok 4.5
LMArena Text: business and finance12671441Grok 4.5
FACTS Benchmark SuiteNot measured50.2%Only Grok 4.5 measured
Neither model has a result on the other 4 boards here
Web designLike-for-likePublic boards, shown as published, kept out of the index06
Web design benchmarks for GPT-4.1 Nano and Grok 4.5
BenchmarkGPT-4.1 NanoGrok 4.5Leader
Design Arena: websites9721281Grok 4.5
Design Arena: UI components9131280Grok 4.5
Design Arena: game dev9701264Grok 4.5
Design Arena: data viz8911266Grok 4.5
Design Arena: 3D9241257Grok 4.5
Design Arena: all code categories9621275Grok 4.5
Design Arena: SVGNot measured1215Only Grok 4.5 measured
Design Arena: ASCII artNot measured1256Only Grok 4.5 measured
LiveBench designNot measured78.1%Only Grok 4.5 measured
GeneralLike-for-likePublic boards, shown as published, kept out of the index018
General benchmarks for GPT-4.1 Nano and Grok 4.5
BenchmarkGPT-4.1 NanoGrok 4.5Leader
LiveBench data analysisNot measured73.0%Only Grok 4.5 measured
SAGE (Vals AI)Not measured35.0%Only Grok 4.5 measured
MedScribe (Vals AI)Not measured86.9%Only Grok 4.5 measured
Vals Multimodal IndexNot measured63.4%Only Grok 4.5 measured
IFBench32.0%Not measuredOnly GPT-4.1 Nano measured
Long context reasoning (AA-LCR)20.3%79.3%Grok 4.5
DTBench52.5%96.5%Grok 4.5
LMCA5.5%45.2%Grok 4.5
Fiction.LiveBench25.0%Not measuredOnly GPT-4.1 Nano measured
Surface Evolver BenchNot measured74.4%Only Grok 4.5 measured
Furniture assemblyNot measured22.5%Only Grok 4.5 measured
LMArena Text12851448Grok 4.5
LMArena Text: instruction following12661445Grok 4.5
LMArena Text: creative writing12601442Grok 4.5
LMArena Vision10631287Grok 4.5
LMArena Text: English13031453Grok 4.5
LMArena Text: non-English12601440Grok 4.5
LMArena Text: Chinese12701495Grok 4.5
LMArena Text: German12881448Grok 4.5
LMArena Text: Japanese11981430Grok 4.5
LMArena Text: KoreanNot measured1406Only Grok 4.5 measured
LMArena Text: FrenchNot measured1457Only Grok 4.5 measured
LMArena Text: SpanishNot measured1451Only Grok 4.5 measured
LMArena Text: Russian12611449Grok 4.5
LMArena Text: PolishNot measured1432Only Grok 4.5 measured
LMArena Text: multi-turn12771456Grok 4.5
LMArena Text: longer queries12831462Grok 4.5
LMArena Text: writing and language12611445Grok 4.5
LMArena Text: entertainment and media12431434Grok 4.5
LMArena Vision: English11011285Grok 4.5
LMArena Vision: ChineseNot measured1345Only Grok 4.5 measured
LMArena Vision: reading textNot measured1293Only Grok 4.5 measured
LMArena Vision: humorNot measured1276Only Grok 4.5 measured
LMArena Vision: creative writingNot measured1293Only Grok 4.5 measured
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-4.1 Nano and Grok 4.5
BenchmarkGPT-4.1 NanoGrok 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-4.1 Nano$0.0003Fits in one request
Grok 4.5$0.0050Fits in one request

GPT-4.1 Nano costs less

Repository review

50K input + 3K output tokens

GPT-4.1 Nano$0.0062Fits in one request
Grok 4.5$0.118Fits in one request

GPT-4.1 Nano costs less

Agent loop

200K input + 10K output tokens

GPT-4.1 Nano$0.024Fits in one request
Grok 4.5$0.460Fits in one request

GPT-4.1 Nano 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-4.1 Nano and Grok 4.5
SpecificationOpenAI GPT-4.1 NanoSpaceXAI Grok 4.5
MakerOpenAIxAI
WeightsNo public weights listedNo public weights listed
ReleasedApril 14, 2025July 8, 2026
Context window1.05M500K
Input $/Mtok$0.10$2.00
Output $/Mtok$0.40$6.00
Coding indexNot benchmarked58.6
Independent measurements behind it06
Cost per solved taskNot computable$0.62
SourceOpenRouter listingOpenRouter listing

Questions

Is GPT-4.1 Nano better than Grok 4.5 for coding?

Only Grok 4.5 has a coding score, 58.6 on the Vibe Coding Index; GPT-4.1 Nano has none, so the two cannot be ranked on coding. Pick GPT-4.1 Nano for output tokens 15.0x cheaper ($0.40 vs $6.00 per million) and a larger context window (1.05M against 500K tokens).

Which is cheaper, GPT-4.1 Nano or Grok 4.5?

GPT-4.1 Nano costs $0.10 per million input tokens and $0.40 per million output tokens; Grok 4.5 costs $2.00 and $6.00. Cost per solved task is known for Grok 4.5 only.

Which has the bigger context window, GPT-4.1 Nano or Grok 4.5?

GPT-4.1 Nano, with 1.05M tokens against 500K.

How many benchmarks is the GPT-4.1 Nano vs Grok 4.5 comparison based on?

56 benchmarks have a result for both models as of October 22, 2026. GPT-4.1 Nano's coding index rests on 0 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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