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GPT-5.4 Nano vs Grok 4.3

GPT-5.4 Nano leads Grok 4.3 on coding, 44.8 to 37.4 on the Vibe Coding Index, and GPT-5.4 Nano costs 2.0x less per output token ($1.25 vs $2.50 per million). Updated October 22, 2026; 79 benchmarks have a result for both.

Replace GPT-5.4 Nano Replace Grok 4.3
GPT-5.4 NanoOpenAI
Coding
44.8
Overall
45.7
Output $/M
$1.25
19
Grok 4.3xAI
Coding
37.4
Overall
53.1
Output $/M
$2.50
60
vs boards won of 79 shared

GPT-5.4 Nano or Grok 4.3: which to pick

Pick GPT-5.4 Nano for coding: it scores 44.8 on the Vibe Coding Index against 37.4 for Grok 4.3, though on 2 benchmarks against 3.

Pick Grok 4.3 for a larger context window (1M against 400K tokens) and work measured by LiveCodeBench (Vals AI) or SWE-bench Verified (Vals AI), where it leads.

Model AGPT-5.4 NanoOpenAI44.8/1002 independent benchmarks$0.14 per solved taskModel BGrok 4.3xAI37.4/1003 independent benchmarks$0.31 per solved task
Shared results
79
GPT-5.4 Nano only
6
Grok 4.3 only
26
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 Nano 44.8 from 2 benchmarks, Grok 4.3 37.4 from 3 benchmarks.
Widest category
Agentic work, 9.9 points apart on average over 6 shared benchmarks.
Widest single gap
CaseLaw (Vals AI): GPT-5.4 Nano 51.9% against Grok 4.3 79.3%, 27.4 points apart on a 0 to 100 scale.
Output price
GPT-5.4 Nano $1.25 against Grok 4.3 $2.50 per million output tokens, 2.0x apart.
Context window
GPT-5.4 Nano takes 400K tokens, Grok 4.3 1M.

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 NanoBarsGrok 4.3Ties
Coding57
Intelligence01
Agentic work33
Reasoning29
Math33
Knowledge210
General427
All shared boards1960
CodingLike-for-likeSix of these boards feed the Vibe Coding Index57
Coding benchmarks for GPT-5.4 Nano and Grok 4.3
BenchmarkGPT-5.4 NanoGrok 4.3Leader
LMArena WebDevNot measured1358Only Grok 4.3 measured
AA Coding Index56.142.2GPT-5.4 Nano
LiveCodeBench (Vals AI)84.0%84.5%Grok 4.3
SWE-bench Verified (Vals AI)69.8%71.4%Grok 4.3
Vibe Code Bench (Vals AI)26.1%19.4%GPT-5.4 Nano
Code migration (Vals AI)14.5%6.8%GPT-5.4 Nano
ProgramBench (Vals AI)Not measured0.0%Only Grok 4.3 measured
Terminal-Bench 2.1 (Vals AI)41.6%42.0%Grok 4.3
SkillsBench (Vals AI)Not measured40.6%Only Grok 4.3 measured
SciCode47.2%48.3%Grok 4.3
Terminal-Bench Hard (Artificial Analysis run)42.4%37.9%GPT-5.4 Nano
WeirdML49.2%49.9%Grok 4.3
ALE-Bench1004.5944.2GPT-5.4 Nano
LMArena Text: coding14041415Grok 4.3
LMArena Text: software and IT14021416Grok 4.3
LMArena WebDev: ReactNot measured1353Only Grok 4.3 measured
LMArena WebDev: HTMLNot measured1367Only Grok 4.3 measured
LMArena WebDev: from an imageNot measured1375Only Grok 4.3 measured
Neither model has a result on the other 21 boards here
IntelligenceLike-for-likePublic boards, shown as published, kept out of the index01
Intelligence benchmarks for GPT-5.4 Nano and Grok 4.3
BenchmarkGPT-5.4 NanoGrok 4.3Leader
AA Intelligence Index20.724.9Grok 4.3
Epoch Capabilities Index146.0Not measuredOnly GPT-5.4 Nano measured
Agentic workLike-for-likePublic boards, shown as published, kept out of the index33
Agentic work benchmarks for GPT-5.4 Nano and Grok 4.3
BenchmarkGPT-5.4 NanoGrok 4.3Leader
AA Agentic Index16.015.5GPT-5.4 Nano
Design Arena: agents building web appsNot measured1126Only Grok 4.3 measured
Design Arena: agents building full-stack appsNot measured1006Only Grok 4.3 measured
Design Arena: agents building mobile appsNot measured1058Only Grok 4.3 measured
Design Arena: agents building Android appsNot measured962Only Grok 4.3 measured
Design Arena: agents building Godot gamesNot measured914Only Grok 4.3 measured
Design Arena: agents building gamesNot measured1007Only Grok 4.3 measured
Design Arena: HTML slidesNot measured959Only Grok 4.3 measured
Design Arena: PowerPoint slidesNot measured988Only Grok 4.3 measured
Design Arena: spreadsheetsNot measured879Only Grok 4.3 measured
Finance Agent (Vals AI)38.2%37.7%GPT-5.4 Nano
Tax Agent Bench (Vals AI)5.0%6.2%Grok 4.3
Legal Research Bench (Vals AI)6.3%15.4%Grok 4.3
Excel Modeling Benchmark (Vals AI)44.8%18.4%GPT-5.4 Nano
τ²-Bench Telecom76.0%97.7%Grok 4.3
Vending-Bench 2Not measured$35Only Grok 4.3 measured
LMArena SearchNot measured1166Only Grok 4.3 measured
Neither model has a result on the other 24 boards here
ReasoningLike-for-likePublic boards, shown as published, kept out of the index29
Reasoning benchmarks for GPT-5.4 Nano and Grok 4.3
BenchmarkGPT-5.4 NanoGrok 4.3Leader
GPQA Diamond77.5%91.4%Grok 4.3
MMMU Pro (Vals AI)73.6%83.1%Grok 4.3
GPQA Diamond (Artificial Analysis run)81.7%90.1%Grok 4.3
Humanity's Last Exam (Artificial Analysis run)28.3%37.2%Grok 4.3
GPQA Diamond (Epoch AI run)78.5%88.8%Grok 4.3
ARC-AGI51.5%Not measuredOnly GPT-5.4 Nano measured
ARC-AGI-25.7%Not measuredOnly GPT-5.4 Nano measured
Chess puzzles45.0%18.0%GPT-5.4 Nano
Mystery game puzzles9.0%Not measuredOnly GPT-5.4 Nano measured
LMArena Text: hard prompts13811396Grok 4.3
LMArena Text: expert13961384GPT-5.4 Nano
LMArena Text: hard prompts in English13871402Grok 4.3
LMArena Vision: diagrams12101241Grok 4.3
LMArena Vision: homework12251241Grok 4.3
Kagi LLM Benchmark39.7%Not measuredOnly GPT-5.4 Nano measured
Neither model has a result on the other 7 boards here
MathLike-for-likePublic boards, shown as published, kept out of the index33
Math benchmarks for GPT-5.4 Nano and Grok 4.3
BenchmarkGPT-5.4 NanoGrok 4.3Leader
AIME88.8%Not measuredOnly GPT-5.4 Nano measured
OTIS Mock AIME87.8%93.3%Grok 4.3
FrontierMath, tiers 1 to 344.9%42.8%GPT-5.4 Nano
FrontierMath, tier 412.2%14.6%Grok 4.3
ProofBench5.0%11.0%Grok 4.3
LMArena Text: math14051387GPT-5.4 Nano
LMArena Text: mathematical work14091396GPT-5.4 Nano
Neither model has a result on the other 6 boards here
KnowledgeLike-for-likePublic boards, shown as published, kept out of the index210
Knowledge benchmarks for GPT-5.4 Nano and Grok 4.3
BenchmarkGPT-5.4 NanoGrok 4.3Leader
MMLU Pro77.2%85.8%Grok 4.3
LegalBench (Vals AI)77.9%84.5%Grok 4.3
CaseLaw (Vals AI)51.9%79.3%Grok 4.3
CorpFin (Vals AI)61.2%68.5%Grok 4.3
TaxEval (Vals AI)67.4%70.8%Grok 4.3
MortgageTax (Vals AI)59.1%48.3%GPT-5.4 Nano
MedCode (Vals AI)41.0%38.1%GPT-5.4 Nano
SimpleQA Verified11.7%33.2%Grok 4.3
LMArena Text: science13741399Grok 4.3
LMArena Text: medicine and healthcare13691384Grok 4.3
LMArena Text: legal and government13681386Grok 4.3
LMArena Text: business and finance13661381Grok 4.3
Neither model has a result on the other 6 boards here
Web designDirectional onlyPublic boards, shown as published, kept out of the index8 boards, none shared
Web design benchmarks for GPT-5.4 Nano and Grok 4.3
BenchmarkGPT-5.4 NanoGrok 4.3Leader
Design Arena: websitesNot measured1196Only Grok 4.3 measured
Design Arena: UI componentsNot measured1190Only Grok 4.3 measured
Design Arena: game devNot measured1173Only Grok 4.3 measured
Design Arena: data vizNot measured1179Only Grok 4.3 measured
Design Arena: 3DNot measured1124Only Grok 4.3 measured
Design Arena: all code categoriesNot measured1186Only Grok 4.3 measured
Design Arena: SVGNot measured1080Only Grok 4.3 measured
Design Arena: ASCII artNot measured1125Only Grok 4.3 measured
Neither model has a result on the other 1 board here
GeneralLike-for-likePublic boards, shown as published, kept out of the index427
General benchmarks for GPT-5.4 Nano and Grok 4.3
BenchmarkGPT-5.4 NanoGrok 4.3Leader
Public Benefits Bench (Vals AI)Not measured51.7%Only Grok 4.3 measured
SAGE (Vals AI)38.1%19.7%GPT-5.4 Nano
MedScribe (Vals AI)77.1%74.4%GPT-5.4 Nano
Vals Multimodal Index47.6%43.3%GPT-5.4 Nano
IFBench75.9%83.3%Grok 4.3
Long context reasoning (AA-LCR)76.7%75.0%GPT-5.4 Nano
DTBench80.3%90.7%Grok 4.3
LMCA36.9%38.3%Grok 4.3
LMArena Text13721397Grok 4.3
LMArena Text: instruction following13621366Grok 4.3
LMArena Text: creative writing13151380Grok 4.3
LMArena Vision11961229Grok 4.3
LMArena Text: English13811404Grok 4.3
LMArena Text: non-English13591385Grok 4.3
LMArena Text: Chinese13911422Grok 4.3
LMArena Text: German13681395Grok 4.3
LMArena Text: Japanese13431379Grok 4.3
LMArena Text: Korean13211354Grok 4.3
LMArena Text: French13951411Grok 4.3
LMArena Text: Spanish13711399Grok 4.3
LMArena Text: Russian13631399Grok 4.3
LMArena Text: Polish13661398Grok 4.3
LMArena Text: multi-turn13821406Grok 4.3
LMArena Text: longer queries13651393Grok 4.3
LMArena Text: writing and language13381385Grok 4.3
LMArena Text: entertainment and media13251370Grok 4.3
LMArena Vision: English12021235Grok 4.3
LMArena Vision: Chinese12321257Grok 4.3
LMArena Vision: reading text12041235Grok 4.3
LMArena Vision: humor11611222Grok 4.3
LMArena Vision: recognizing things11411217Grok 4.3
LMArena Vision: creative writing11591237Grok 4.3
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 Nano and Grok 4.3
BenchmarkGPT-5.4 NanoGrok 4.3Leader
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 Nano$0.0008Fits in one request
Grok 4.3$0.0025Fits in one request

GPT-5.4 Nano costs less

Repository review

50K input + 3K output tokens

GPT-5.4 Nano$0.014Fits in one request
Grok 4.3$0.070Fits in one request

GPT-5.4 Nano costs less

Agent loop

200K input + 10K output tokens

GPT-5.4 Nano$0.052Fits in one request
Grok 4.3$0.275Fits in one request

GPT-5.4 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-5.4 Nano and Grok 4.3
SpecificationOpenAI GPT-5.4 NanoSpaceXAI Grok 4.3
MakerOpenAIxAI
WeightsNo public weights listedNo public weights listed
ReleasedMarch 17, 2026April 30, 2026
Context window400K1M
Input $/Mtok$0.20$1.25
Output $/Mtok$1.25$2.50
Coding index44.837.4
Independent measurements behind it23
Cost per solved task$0.14$0.31
SourceOpenRouter listingOpenRouter listing

Questions

Is GPT-5.4 Nano better than Grok 4.3 for coding?

Pick GPT-5.4 Nano for coding: it scores 44.8 on the Vibe Coding Index against 37.4 for Grok 4.3, though on 2 benchmarks against 3. Pick Grok 4.3 for a larger context window (1M against 400K tokens) and work measured by LiveCodeBench (Vals AI) or SWE-bench Verified (Vals AI), where it leads.

Which is cheaper, GPT-5.4 Nano or Grok 4.3?

GPT-5.4 Nano costs $0.20 per million input tokens and $1.25 per million output tokens; Grok 4.3 costs $1.25 and $2.50. Per solved SWE-bench Verified task, GPT-5.4 Nano costs $0.14 and Grok 4.3 $0.31.

Which has the bigger context window, GPT-5.4 Nano or Grok 4.3?

Grok 4.3, with 1M tokens against 400K.

How many benchmarks is the GPT-5.4 Nano vs Grok 4.3 comparison based on?

79 benchmarks have a result for both models as of October 22, 2026. GPT-5.4 Nano's coding index rests on 2 independent benchmarks and Grok 4.3's on 3. Where only one model has a result, the page says so instead of naming a winner.

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