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Grok 4.3 vs Grok 4.5

Updated October 21, 2026. 98 benchmarks have a result for both. Coding is ranked on the Vibe Coding Index; every other board is shown as published.

Replace Grok 4.3 Replace Grok 4.5
Grok 4.3xAI
Coding
22.5
Overall
24.9
Output $/M
$2.50
3
Grok 4.5xAI
Coding
75.5
Overall
38.8
Output $/M
$6.00
94
vs boards won of 98 shared, 1 tied

Decision reading

Pick Grok 4.5 for coding: it scores 75.5 on the Vibe Coding Index against 22.5 for Grok 4.3.

Pick Grok 4.3 when output tokens cost 2.4x less, or when a solved task costs $0.31 against $0.62.

Model AGrok 4.3xAI22.5/1001 independent benchmark$0.31 per solved taskModel BGrok 4.5xAI75.5/1002 independent benchmarks$0.62 per solved task
Shared results
98
Grok 4.3 only
6
Grok 4.5 only
22
Like-for-like categories
8 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
Grok 4.3 22.5 from 1 benchmark, Grok 4.5 75.5 from 2 benchmarks.
Widest category
Agentic work, 24.1 points apart on average over 15 shared benchmarks.
Widest single gap
Vibe Code Bench (Vals AI): Grok 4.3 19.4% against Grok 4.5 69.0%, 49.6 points apart on a 0 to 100 scale.
Output price
Grok 4.3 $2.50 against Grok 4.5 $6.00 per million output tokens, 2.4x apart.
Context window
Grok 4.3 takes 1M 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
CategoryGrok 4.3BarsGrok 4.5Ties
Coding1151 tie
Intelligence01
Agentic work015
Reasoning110
Math06
Knowledge110
Web design08
General029
All shared boards3941 tie
CodingLike-for-likeFour of these boards feed the Vibe Coding Index115
Coding benchmarks for Grok 4.3 and Grok 4.5
BenchmarkGrok 4.3Grok 4.5Leader
LiveBench codingNot measured94.3%Only Grok 4.5 measured
LMArena WebDev13581553Grok 4.5
AA Coding Index42.272.4Grok 4.5
LiveCodeBench (Vals AI)84.5%87.3%Grok 4.5
SWE-bench Verified (Vals AI)71.4%86.6%Grok 4.5
Terminal-Bench 4 (Vals AI)Not measured8.6%Only Grok 4.5 measured
Vibe Code Bench (Vals AI)19.4%69.0%Grok 4.5
Code migration (Vals AI)6.8%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)42.0%67.8%Grok 4.5
SkillsBench (Vals AI)40.6%66.0%Grok 4.5
CyberBench (Vals AI)Not measured71.0%Only Grok 4.5 measured
SciCode48.3%55.0%Grok 4.5
Terminal-Bench Hard (Artificial Analysis run)37.9%Not measuredOnly Grok 4.3 measured
FrontierCodeNot measured42.4%Only Grok 4.5 measured
WeirdML49.9%46.4%Grok 4.3
ALE-Bench944.21309.3Grok 4.5
LMArena Text: coding14151474Grok 4.5
LMArena Text: software and IT14161471Grok 4.5
LMArena WebDev: React13531556Grok 4.5
LMArena WebDev: HTML13671567Grok 4.5
LMArena WebDev: from an image13751562Grok 4.5
Neither model has a result on the other 15 boards here
IntelligenceLike-for-likePublic boards, shown as published, kept out of the index01
Intelligence benchmarks for Grok 4.3 and Grok 4.5
BenchmarkGrok 4.3Grok 4.5Leader
AA Intelligence Index24.938.8Grok 4.5
Epoch Capabilities IndexNot measured154.1Only Grok 4.5 measured
Agentic workLike-for-likePublic boards, shown as published, kept out of the index015
Agentic work benchmarks for Grok 4.3 and Grok 4.5
BenchmarkGrok 4.3Grok 4.5Leader
AA Agentic Index15.541.2Grok 4.5
Design Arena: agents building web apps11261217Grok 4.5
Design Arena: agents building full-stack apps10061249Grok 4.5
Design Arena: agents building mobile apps10591221Grok 4.5
Design Arena: agents building Android apps9671242Grok 4.5
Design Arena: agents building Godot games9141229Grok 4.5
Design Arena: agents building games10071235Grok 4.5
Design Arena: HTML slides10081204Grok 4.5
Design Arena: PowerPoint slides10121232Grok 4.5
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)37.7%48.4%Grok 4.5
Tax Agent Bench (Vals AI)6.2%24.9%Grok 4.5
Legal Research Bench (Vals AI)15.4%38.0%Grok 4.5
Excel Modeling Benchmark (Vals AI)18.4%52.9%Grok 4.5
Time Horizon Index (Vals AI)Not measured6.3%Only Grok 4.5 measured
τ²-Bench Telecom97.7%Not measuredOnly Grok 4.3 measured
APEX-AgentsNot measured56.2%Only Grok 4.5 measured
PostTrainBenchNot measured23.4%Only Grok 4.5 measured
Vending-Bench 2$35$3,887Grok 4.5
LMArena Search11661216Grok 4.5
Neither model has a result on the other 16 boards here
ReasoningLike-for-likePublic boards, shown as published, kept out of the index110
Reasoning benchmarks for Grok 4.3 and Grok 4.5
BenchmarkGrok 4.3Grok 4.5Leader
GPQA Diamond91.4%92.9%Grok 4.5
LiveBench reasoningNot measured87.2%Only Grok 4.5 measured
MMMU Pro (Vals AI)83.1%61.8%Grok 4.3
GPQA Diamond (Artificial Analysis run)90.1%93.1%Grok 4.5
Humanity's Last Exam (Artificial Analysis run)37.2%42.7%Grok 4.5
GPQA Diamond (Epoch AI run)88.8%93.4%Grok 4.5
ARC-AGINot measured87.2%Only Grok 4.5 measured
ARC-AGI-2Not measured52.6%Only Grok 4.5 measured
SimpleBenchNot measured70.0%Only Grok 4.5 measured
Chess puzzles18.0%35.0%Grok 4.5
LMArena Text: hard prompts13961462Grok 4.5
LMArena Text: expert13841465Grok 4.5
LMArena Text: hard prompts in English14021464Grok 4.5
LMArena Vision: diagrams12411304Grok 4.5
LMArena Vision: homework12411295Grok 4.5
Neither model has a result on the other 6 boards here
MathLike-for-likePublic boards, shown as published, kept out of the index06
Math benchmarks for Grok 4.3 and Grok 4.5
BenchmarkGrok 4.3Grok 4.5Leader
OTIS Mock AIME93.3%97.8%Grok 4.5
FrontierMath, tiers 1 to 342.8%57.2%Grok 4.5
FrontierMath, tier 414.6%24.4%Grok 4.5
ProofBench11.0%31.0%Grok 4.5
LMArena Text: math13871460Grok 4.5
LMArena Text: mathematical work13961482Grok 4.5
Neither model has a result on the other 7 boards here
KnowledgeLike-for-likePublic boards, shown as published, kept out of the index110
Knowledge benchmarks for Grok 4.3 and Grok 4.5
BenchmarkGrok 4.3Grok 4.5Leader
MMLU Pro85.8%89.2%Grok 4.5
LegalBench (Vals AI)84.5%86.0%Grok 4.5
CaseLaw (Vals AI)79.3%Not measuredOnly Grok 4.3 measured
CorpFin (Vals AI)68.5%67.4%Grok 4.3
TaxEval (Vals AI)70.8%71.7%Grok 4.5
MortgageTax (Vals AI)48.3%61.8%Grok 4.5
MedCode (Vals AI)38.1%43.3%Grok 4.5
SimpleQA Verified33.2%48.3%Grok 4.5
LMArena Text: science13991464Grok 4.5
LMArena Text: medicine and healthcare13841440Grok 4.5
LMArena Text: legal and government13861463Grok 4.5
LMArena Text: business and finance13811441Grok 4.5
Neither model has a result on the other 5 boards here
Web designLike-for-likePublic boards, shown as published, kept out of the index08
Web design benchmarks for Grok 4.3 and Grok 4.5
BenchmarkGrok 4.3Grok 4.5Leader
Design Arena: websites11961281Grok 4.5
Design Arena: UI components11921279Grok 4.5
Design Arena: game dev11741263Grok 4.5
Design Arena: data viz11801267Grok 4.5
Design Arena: 3D11251257Grok 4.5
Design Arena: all code categories11871276Grok 4.5
Design Arena: SVG10811215Grok 4.5
Design Arena: ASCII art11251257Grok 4.5
LiveBench designNot measured78.1%Only Grok 4.5 measured
GeneralLike-for-likePublic boards, shown as published, kept out of the index029
General benchmarks for Grok 4.3 and Grok 4.5
BenchmarkGrok 4.3Grok 4.5Leader
LiveBench data analysisNot measured73.0%Only Grok 4.5 measured
Public Benefits Bench (Vals AI)51.7%Not measuredOnly Grok 4.3 measured
SAGE (Vals AI)19.7%35.0%Grok 4.5
MedScribe (Vals AI)74.4%86.9%Grok 4.5
Vals Multimodal Index43.3%63.4%Grok 4.5
IFBench83.3%Not measuredOnly Grok 4.3 measured
Long context reasoning (AA-LCR)75.0%79.3%Grok 4.5
DTBench90.7%96.5%Grok 4.5
LMCA38.3%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 Text13971448Grok 4.5
LMArena Text: instruction following13661445Grok 4.5
LMArena Text: creative writing13801442Grok 4.5
LMArena Vision12291287Grok 4.5
LMArena Text: English14041453Grok 4.5
LMArena Text: non-English13851440Grok 4.5
LMArena Text: Chinese14221495Grok 4.5
LMArena Text: German13951448Grok 4.5
LMArena Text: Japanese13791430Grok 4.5
LMArena Text: Korean13541406Grok 4.5
LMArena Text: French14111457Grok 4.5
LMArena Text: Spanish13991451Grok 4.5
LMArena Text: Russian13991449Grok 4.5
LMArena Text: Polish13981432Grok 4.5
LMArena Text: multi-turn14061456Grok 4.5
LMArena Text: longer queries13931462Grok 4.5
LMArena Text: writing and language13851445Grok 4.5
LMArena Text: entertainment and media13701434Grok 4.5
LMArena Vision: English12351285Grok 4.5
LMArena Vision: Chinese12571345Grok 4.5
LMArena Vision: reading text12351293Grok 4.5
LMArena Vision: humor12221276Grok 4.5
LMArena Vision: recognizing things1217Not measuredOnly Grok 4.3 measured
LMArena Vision: creative writing12371293Grok 4.5
LMArena DocumentNot measured1452Only Grok 4.5 measured
Neither model has a result on the other 10 boards here
Image generationNot comparablePublic boards, shown as published, kept out of the index0 boards, none shared
Image generation benchmarks for Grok 4.3 and Grok 4.5
BenchmarkGrok 4.3Grok 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

Grok 4.3$0.0025Fits in one request
Grok 4.5$0.0050Fits in one request

Grok 4.3 costs less

Repository review

50K input + 3K output tokens

Grok 4.3$0.070Fits in one request
Grok 4.5$0.118Fits in one request

Grok 4.3 costs less

Agent loop

200K input + 10K output tokens

Grok 4.3$0.275Fits in one request
Grok 4.5$0.460Fits in one request

Grok 4.3 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 Grok 4.3 and Grok 4.5
SpecificationSpaceXAI Grok 4.3SpaceXAI Grok 4.5
MakerxAIxAI
WeightsNo public weights listedNo public weights listed
ReleasedApril 30, 2026July 8, 2026
Context window1M500K
Input $/Mtok$1.25$2.00
Output $/Mtok$2.50$6.00
Coding index22.575.5
Independent measurements behind it12
Cost per solved task$0.31$0.62
SourceOpenRouter listingOpenRouter listing

Questions

Is Grok 4.3 better than Grok 4.5 for coding?

Pick Grok 4.5 for coding: it scores 75.5 on the Vibe Coding Index against 22.5 for Grok 4.3. Pick Grok 4.3 when output tokens cost 2.4x less, or when a solved task costs $0.31 against $0.62.

Which is cheaper, Grok 4.3 or Grok 4.5?

Grok 4.3 costs $1.25 per million input tokens and $2.50 per million output tokens; Grok 4.5 costs $2.00 and $6.00. Per solved SWE-bench Verified task, Grok 4.3 costs $0.31 and Grok 4.5 $0.62.

Which has the bigger context window, Grok 4.3 or Grok 4.5?

Grok 4.3, with 1M tokens against 500K.

How many benchmarks is the Grok 4.3 vs Grok 4.5 comparison based on?

98 benchmarks have a result for both models as of October 21, 2026. Grok 4.3's coding index rests on 1 independent benchmark and Grok 4.5's on 2. Where only one model has a result, the page says so instead of naming a winner.

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